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BEGIN:VEVENT
SUMMARY:alpha_s from hadron multiplicities
DTSTART;VALUE=DATE-TIME:20261029T073000Z
DTEND;VALUE=DATE-TIME:20261029T074500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6528@cern.ch
DESCRIPTION:Speakers: Anatoly Kotikov (JINR)\nExploring the anomalous dime
 nsions\, resummed through next-to-next-to-leading-logarithmic order\, we s
 tudy the first Mellin moments $D_{q\,g}(\\mu^2)$ of the quark and gluon fr
 agmentation functions\, which correspond to the average hadron multiplicit
 ies in jets initiated by quarks and gluons\, respectively. By fitting the 
 world data on $D_{q\,g}(\\mu^2)$ for charged hadrons measured in\n$e^+e^-$
  annihilation\, we find a good agreement with the data and obtain\nthe fol
 lowing value for the strong coupling $\\alpha_s^{(5)}(M_Z)=0.1177+0.0027-0
 .0025$.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6528/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6528/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On alpha_s extraction from the e^+e^- to hadrons data below and ab
 ove thresholds of charm quark production
DTSTART;VALUE=DATE-TIME:20261030T140000Z
DTEND;VALUE=DATE-TIME:20261030T141500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6147@cern.ch
DESCRIPTION:Speakers: Andrei Kataev (INR RAS and JINR)\nThe QCD analysis o
 f the available data of KEDR\, BESIII and CLEO Collaborations \nfor the e^
 +e^ to hadrons total cross-sections in different orders of perturbation th
 eory is analysed. The existence of the tension between KEDR and BESIII dat
 a is emphasized with the preference to KEDR Collaboration data . The obtai
 ned values of QCD coupling constant are compared to other  world average e
 xtractions . The \nmaterial is based in part on the results of the recent 
 work A.~L.~Kataev and K.~Y.~Todyshev\,``Perturbative QCD fitting of KEDR a
 nd BESIII $e^+e^-$ data for R(s) and $α_s$ determination\,'' Natural Sci.
  Rev. \\textbf{3} (2026)\, 100801\n[arXiv:2603.29803 [hep-ph]].\n\nhttps:/
 /indico.particle.mephi.ru/event/626/contributions/6147/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6147/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Excited states with high orbital angular momentum of the muon in m
 uonic-electronic helium atoms
DTSTART;VALUE=DATE-TIME:20261030T143000Z
DTEND;VALUE=DATE-TIME:20261030T144500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6169@cern.ch
DESCRIPTION:Speakers: Darya Pometko (Samara University)\nThe variational m
 ethod is used to study the energy levels of muonic helium (μ− − e− 
 − He) with an electron in the ground state and a muon in an excited stat
 e with principal and orbital quantum numbers n ∼ l + 1 ∼ 14 (the Rydbe
 rg muon states). The variational wave functions are chosen in the Gaussian
  form. The matrix elements of the Hamiltonian in the nonrelativistic appro
 ximation\, as well as corrections for the vacuum polarization and relativi
 sm\, are calculated analytically. A series of energies of the high-angular
 -momentum muon states is obtained\, which can be studied experimentally.\n
 \nhttps://indico.particle.mephi.ru/event/626/contributions/6169/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6169/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic corrections to leptonium production in Z boson decay
DTSTART;VALUE=DATE-TIME:20261030T144500Z
DTEND;VALUE=DATE-TIME:20261030T150000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6170@cern.ch
DESCRIPTION:Speakers: Fedor Martynenko (Samara University)\nThe processes 
 of leptonium production in Z-boson decay are investigated. Various decay m
 echanisms are examined\, and relativistic decay amplitudes are constructed
 \, taking into account the relative momenta of leptons. Decay widths are c
 alculated for various mechanisms in the nonrelativistic approximation and 
 taking into account relativistic corrections.\n\nhttps://indico.particle.m
 ephi.ru/event/626/contributions/6170/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6170/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiative corrections of order alpha(Z alpha)^6 in the energy spec
 trum of muonic hydrogen
DTSTART;VALUE=DATE-TIME:20261030T153000Z
DTEND;VALUE=DATE-TIME:20261030T154500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6171@cern.ch
DESCRIPTION:Speakers: Nikita Kochetkov (Samara National Research Universit
 y)\nRadiative QED corrections of order alpha(Z alpha)^6 to the energy spec
 trum of muonic hydrogen have been calculated. They are determined by the a
 mplitudes of the three-photon exchange interaction involving one radiative
  photon. Nuclear structure effects arising from the expansion of electroma
 gnetic form factors have been taken into account. An interparticle interac
 tion potential is constructed for each QED amplitude\, and its contributio
 n to the atomic energy spectrum is obtained.\n\nhttps://indico.particle.me
 phi.ru/event/626/contributions/6171/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6171/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Longitudinal beta-decay vector coupling of nucleons and nuclear is
 ospin doublets
DTSTART;VALUE=DATE-TIME:20261030T150000Z
DTEND;VALUE=DATE-TIME:20261030T151500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6172@cern.ch
DESCRIPTION:Speakers: Nikita Levashko (National Research Center "Kurchatov
  Institute")\nWe study the longitudinal vector component of the weak vecto
 r current in nucleon and nuclear isospin doublets in order to determine th
 e remaining last unknown longitudinal vector coupling $g_s$ of the $\\beta
 $-decay vertex. Using the Ward identity\, we establish relationships betwe
 en the longitudinal form factors and the experimentally known Dirac form f
 actors. These relations involve the scalar form factor of the particle\, w
 hich encodes its scalar charge and scalar mean-square radius. For nucleons
 \, these quantities are evaluated within the MIT bag model and the nonrela
 tivistic oscillator quark model. The approach is then extended to nuclear 
 isospin doublets\, where scalar densities are calculated using the Deforme
 d Relativistic Hartree–Bogoliubov model in the continuum (DRHBc). The re
 sulting scalar charges and radii allow to evaluate the coupling $g_s$ for 
 nucleons and nuclei.\n\nhttps://indico.particle.mephi.ru/event/626/contrib
 utions/6172/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6172/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark photon production in pion-proton collisions: bremsstrahlung v
 s Drell–Yan mechanisms
DTSTART;VALUE=DATE-TIME:20261030T151500Z
DTEND;VALUE=DATE-TIME:20261030T153000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6173@cern.ch
DESCRIPTION:Speakers: Ekaterina Kriukova (INR RAS\, ITMP MSU)\nThe study i
 nvestigates the production of dark photons in pion-proton collisions throu
 gh two mechanisms: inelastic pion bremsstrahlung and Drell–Yan-like proc
 ess in the mass range 0.4–3.5 GeV.\n\nThe factorization method\, previou
 sly applied to proton bremsstrahlung processes\, is adapted for pion beams
  to overcome the limitations of chiral perturbation theory at high energie
 s. The splitting function for pion bremsstrahlung is derived\, linking the
  dark photon production cross section to the inclusive inelastic pion-prot
 on scattering cross section.\n \nFor the Drell–Yan process\, both leadin
 g- and next-to-leading-order contributions within perturbative QCD are con
 sidered.\n\nThe results show that pion bremsstrahlung dominates dark photo
 n production for masses 0.4–1.3 GeV\, while the Drell–Yan process beco
 mes dominant in the 1.3–3.5 GeV range. Mean energies of produced dark ph
 otons are estimated for pion momenta relevant to T2K\, DUNE\, and SHiP exp
 eriments.\n\nThese findings provide crucial inputs for dark photon searche
 s in fixed-target experiments\, particularly NA64h at CERN SPS.\n\nhttps:/
 /indico.particle.mephi.ru/event/626/contributions/6173/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6173/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Code for simulations of light nucleus-nucleus elastic interactions
DTSTART;VALUE=DATE-TIME:20261030T141500Z
DTEND;VALUE=DATE-TIME:20261030T143000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6174@cern.ch
DESCRIPTION:Speakers: Aida Galoyan (Joint Institute for Nuclear Research)\
 nAt future NICA/SPD experiment\,  polarized and un-polarized proton-proton
   (pp)\, deuteron-deuteron (dd)\, and\, possible\, helium-helium (HeHe) in
 teractions will be investigated. Therefore\, Monte Carlo simulations of li
 ght nucleus-nucleus inelastic and elastic collisions are needed for design
 ing and physical program development of the SPD experiment.\nOur work is a
 imed to create a code for simulations of elastic interactions of light nuc
 lei\, especially of dd-scatterings.  At the beginning\, we used Geant4 mod
 els for elastic scattering’s modeling  – ElasticDIFF and ElasticCHIPS.
   It was observed that Geant4 elastic models can describe the elastic inte
 ractions at low four-momentum transfer (t) and low energies. However\, the
 y are not applicable to the elastic dd interactions at higher energies. \n
 Then\, we have applied codes based on the Glauber theoretical model to ela
 stic dd interactions.  Quite good results have been obtained when comparin
 g experimental data on dd elastic interactions at high energies and our ca
 lculations based on these codes. Earlier\, codes based on Glauber approach
  were written in FORTRAN. Using these in frameworks  of NICA experiments i
 s cumbersome. Thus\, we have created a new C++ code based on Glauber model
 \, starting from the old FORTRAN codes. Some results obtained with the new
  C++ code will be presented in our report. The new code allows also to cal
 culate elastic interactions of light nuclei like pp\, dd\, HeHe\, and pHe.
 \n\nhttps://indico.particle.mephi.ru/event/626/contributions/6174/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6174/
END:VEVENT
BEGIN:VEVENT
SUMMARY:P\, T-violating effects in interactions with light particles in mo
 lecules
DTSTART;VALUE=DATE-TIME:20261030T154500Z
DTEND;VALUE=DATE-TIME:20261030T160000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6176@cern.ch
DESCRIPTION:Speakers: Anna Zakharova (Saint-Petersburg State University)\n
 Currently\, a new generation of parity-violation searching experiments is 
 planned with laser-cooled polyatomic molecules\, such as the triatomic mol
 ecule RaOH. In this talk\, we will examine the sensitivity of these triato
 mic molecules to the interactions of electrons with nuclei and electrons w
 ith electrons through single-loop exchange processes of relatively light (
 less than 100 keV) fermions. \n\nThe work was supported by the Russian Sci
 ence Foundation (grant number № 26-72-00029).\n\nhttps://indico.particle
 .mephi.ru/event/626/contributions/6176/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6176/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Double longitudinal spin asymmetry of direct photons in collisions
  of longitudinally polarized protons in the NLO approximation taking into 
 account electromagnetic corrections
DTSTART;VALUE=DATE-TIME:20261030T083000Z
DTEND;VALUE=DATE-TIME:20261030T084500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6161@cern.ch
DESCRIPTION:Speakers: Dmitry Kruashvili (Peter the Great St.Petersburg Pol
 ytechnic University)\nThis paper presents a comparative analysis of the va
 rious contributions of subprocesses to the double longitudinal spin asymme
 try of direct photons produced in collisions of polarized protons at PHENI
 X and SPD energies in the NLO approximation\, which has not been considere
 d previously. The contributions of each subprocess and all subprocesses to
 gether are presented at energies of 510 and 27 GeV. A comparison of the ca
 lculated and experimental results at 510 GeV is presented\, demonstrating 
 good agreement. The results obtained at 27 GeV can be considered as a pred
 iction for the SPD experiment.\n\nThe work was carried out within the fram
 ework of the State assignment for conducting fundamental research (topic c
 ode FSEG-2025-0009).\n\nhttps://indico.particle.mephi.ru/event/626/contrib
 utions/6161/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6161/
END:VEVENT
BEGIN:VEVENT
SUMMARY:T-even Angular Coefficients in the Drell–Yan Process with $\\gam
 ma/Z^0$ Interference
DTSTART;VALUE=DATE-TIME:20261030T084500Z
DTEND;VALUE=DATE-TIME:20261030T090000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6162@cern.ch
DESCRIPTION:Speakers: Iurii Anikin (JINR\, MIPT)\nWe investigate the trans
 verse momentum dependence of the angular distribution in the Drell-Yan pro
 cess\, incorporating $\\gamma/Z^0$ interference in the dilepton decay. Our
  partonic-level analytical calculations are performed in perturbative QCD 
 using collinear factorization at order $\\alpha_s$. We analytically calcul
 ate the partonic-level T-even helicity structure functions and subsequentl
 y convolve them numerically with parton distribution functions to obtain h
 adronic-level observables\, including angular coefficients and the forward
 -backward asymmetry.\n\nhttps://indico.particle.mephi.ru/event/626/contrib
 utions/6162/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6162/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy neutrinos in $e^+e^- \\to W^+W^-$: future colliders constrai
 nts
DTSTART;VALUE=DATE-TIME:20261030T100000Z
DTEND;VALUE=DATE-TIME:20261030T101500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6163@cern.ch
DESCRIPTION:Speakers: Georgy Chachava (MIPT)\nWe study the sensitivity of 
 future lepton colliders to heavy neutral leptons implemented within the se
 esaw type-I model through precision measurements of $e^+e^- \\to W^+W^-$. 
 Heavy–light neutrino mixing modifies the angular distribution and total 
 cross section of $W$-pair production. We derive prospective 95% C. L. cons
 traints for CEPC\, FCC-ee\, ILC\, CLIC\, and muon colliders\, including th
 e dependence on the heavy neutrino mass. We find that central angular regi
 on measurements can significantly improve the sensitivity for masses above
  the collider energy. At the same time we show that low energy precise mea
 surement is competitive to high energy measurement.  \n\nBased on paper pu
 blished in Physical Review D 114 (2026)\, 055001\, DOI:\nhttps://doi.org/1
 0.1103/p5nw-316c\n\nhttps://indico.particle.mephi.ru/event/626/contributio
 ns/6163/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6163/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leptonic Angular Coefficients in J/psi Production within the Parto
 n Reggeization Approach
DTSTART;VALUE=DATE-TIME:20261030T090000Z
DTEND;VALUE=DATE-TIME:20261030T091500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6164@cern.ch
DESCRIPTION:Speakers: Kirill Shilyaev (Samara University)\nThe process of 
 $J/\\psi$ production is an important probe for investigation of gluon part
 on distribution functions (PDFs) in proton. Though the charmonium producti
 on cross section and spectra can be satisfactorily calculated in various f
 rameworks\, another observables\, such as angular coefficients in leptonic
  decay of $J/\\psi$\, do not have consistent description yet. In the prese
 nt work\, we obtain estimations for three leptonic angular coefficients in
  the high-energy factorisation (HEF) formalism [1] as it is formulated in 
 the Parton Reggeization Approach (PRA) [2]. We use the nonrelativistic QCD
  (NRQCD) as a hadronisation model for charmonium hadronisation [3]. Firstl
 y\, we made calculations for unpolarised $J/\\psi$ cross section and compa
 red them with the existing experimental data. Then we obtained results for
  leptonic angular coefficients in kinematics of the PHENIX and HERA-B expe
 riments and made predictions for the future SPD NICA experiment.\n\nRefere
 nces:\n\n[1] J. C. Collins and R. K. Ellis\, Nucl. Phys. B360\, 3 (1991)\;
  S. Catani and F. Hautmann\, Nucl. Phys. B427\, 475 (1994)\; L. V. Gribov\
 , E. M. Levin\, and M. G. Ryskin\, Phys. Rep. 100\, 1 (1983)\;\n\n[2] M. A
 . Nefedov\, V. A. Saleev\, and A. V. Shipilova\, Phys. Rev. D 87\, 094030 
 (2013)\; A. V. Karpishkov\, M. A. Nefedov\, and V. A. Saleev\, Phys. Rev. 
 D 96\, 096019 (2017)\; M. A. Nefedov and V. A. Saleev\, Phys. Rev. D 102\,
  114018 (2020)\;\n\n[3] G. T. Bodwin\, E. Braaten\, and G. P. Lepage\, Phy
 s. Rev. D 51\, 1125 (1995).\n\nhttps://indico.particle.mephi.ru/event/626/
 contributions/6164/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6164/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Angular distributions of $D$-meson in the $D\\bar D-$pair producti
 on at high energy
DTSTART;VALUE=DATE-TIME:20261030T091500Z
DTEND;VALUE=DATE-TIME:20261030T093000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6165@cern.ch
DESCRIPTION:Speakers: Lev Alimov (Samara University)\nThe process of $D$-m
 eson production is usually considered an important probe for investigating
  gluon parton distribution functions in the proton\, as well as the heavy 
 quark hadronization mechanism in QCD. In this report\, we demonstrate that
  studying the angular distribution of the $D$-meson in the $D\\bar{D}$-pai
 r production can be used to check the applicability of different factoriza
 tion approaches\, such as the collinear parton model (CPM)[1]\, TMD-factor
 ization (TMD)[2]\, and high-energy factorization (HEF)[3]. First\, angular
  distributions are sensitive to the ratio $r=p_T/M$\, where $p_{T}$ is the
  $D\\bar{D}$-pair  transverse momentum and $M$ is its invariant mass. Sign
 ificantly different azimuthal angle spectra were found in two regions\, $r
  \\ll 1$ and $r \\gg 1$\, which correspond to the applicability regions of
  TMD and CPM\, respectively. At large $r \\gg 1$\, where TMD is inapplicab
 le\, we found different angular distributions predicted by the fixed-order
  NLO CPM and by HEF\, where all-order resummation is applied using uninteg
 rated parton distribution functions in the proton [4].\n\nReferences:\n\n[
 1] J. Collins\, Foundations of Perturbative QCD (Cambridge\nUniversity Pre
 ss\, Cambridge\, 2011).\n\n[2] J. C. Collins\, D. E. Soper\, and G. F. Ste
 rman\,  Adv. Ser. Dir. High Energy Phys.\n5\, 1 (1989).\n\n[3] J. C. Colli
 ns and R. K. Ellis\, Nucl. Phys. B360\, 3 (1991).\nS. Catani and F. Hautma
 nn\, Nucl. Phys. B427\, 475 (1994)\; L.V. Gribov\, E. M. Levin\, and M. G.
  Ryskin\, Phys. Rep. 100\, 1 (1983)\;\n\n[4] M. A. Nefedov\, V. A. Saleev\
 , and A. V. Shipilova\, Phys. Rev. D 87\, 094030 (2013)\; A. V. Karpishkov
 \, M. A. Nefedov\, and V. A. Saleev\, Phys. Rev. D 96\, 096019 (2017)\; M.
 A. Nefedov and V.A. Saleev\, Phys. Rev. D102 (2020)\, 114018\;\n\nhttps://
 indico.particle.mephi.ru/event/626/contributions/6165/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6165/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy neutrinos in $e^+e^- -> W^+W^-$: exact and linearized mixing
DTSTART;VALUE=DATE-TIME:20261030T094500Z
DTEND;VALUE=DATE-TIME:20261030T100000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6166@cern.ch
DESCRIPTION:Speakers: Sergey Godunov (LPI)\nWe study the process $e^+e^- \
 \to W^+W^-$ in case of seesaw type-I with two implementations of heavy-lig
 ht neutrino mixing: a linearized mixing approximation applied in popular m
 odels and an exact unitary mixing scheme. We conclude that the approximate
  realization leads to physically incorrect results for this process\, whil
 e exact unitary mixing provides some signatures that can be experimentally
  checked at future $e^+e^-$-colliders.\n\nhttps://indico.particle.mephi.ru
 /event/626/contributions/6166/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6166/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Indirect Searches for Heavy $Z'$ Bosons at ILC\, CLIC\, and MuC
DTSTART;VALUE=DATE-TIME:20261030T101500Z
DTEND;VALUE=DATE-TIME:20261030T103000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6167@cern.ch
DESCRIPTION:Speakers: Dmitry Sinegribov (Sukhoi Gomel State Technical Univ
 ersity\, Skorina Gomel State University)\nThis talk will present a common 
 framework for indirect searches\nfor heavy neutral gauge bosons at the Int
 ernational Linear\nCollider (ILC)\, the Compact Linear Collider (CLIC)\, a
 nd a muon\ncollider (MuC)\, considering their different energy stages.\nTh
 e analysis will focus on virtual $Z'$ exchange in\nfermion-pair production
  at energies below the resonance\,\nusing a linear parametrization of devi
 ations from\nStandard Model angular distributions in terms of\nhelicity-am
 plitude parameters. The talk will demonstrate\nhow model trajectories in h
 elicity-parameter space can be\nused to investigate the structure of the n
 ew interaction.\nExpected lower limits on the $Z'$ mass will be compared\n
 for selected benchmark models using a binned $\\chi^2$\nanalysis of Standa
 rd Model Asimov data.\n\nhttps://indico.particle.mephi.ru/event/626/contri
 butions/6167/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6167/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The double longitudinal-spin asymmetry in the neutral pion product
 ion
DTSTART;VALUE=DATE-TIME:20261030T093000Z
DTEND;VALUE=DATE-TIME:20261030T094500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6168@cern.ch
DESCRIPTION:Speakers: Vladislav Bondarev (Самарский национ
 альный исследовательский университет и
 мени академика С.П. Королева)\nWe studied the produ
 ction of an inclusive $\\pi^0$ meson within the kinematic range\,\nrelevan
 t to the RHIC and the LHC colliders. We calculated the double longitudinal
 -spin asymmetry (DLSA)\n$\nA_{LL} =\n\\frac{d\\sigma^{++} - d\\sigma^{+-}}
 \n     {d\\sigma^{++} + d\\sigma^{+-}}\n$\nfor the production of neutral p
 ions in $pp$-collisions. This observable\nprovides reliable information on
  the spin-dependent gluon distribution functions of the polarized\nproton.
  For this study we used well-known helicity matrix elements obtained in th
 e collinear parton model at leading order in the strong coupling constant 
 [Babcock\, Monsay\, Sivers\, 1979]. The formation of pions\nwas described 
 by two different sets of fragmentation functions: Kniehl-Kramer-Potter [Kn
 iehl\, Kramer\, Pötter\, 2001]\nand NNFF1.0 [Bertone\, Carrazza\, Hartlan
 d\, Nocera\, Rojo\, 2017]. The results were compared with data from the PH
 ENIX and STAR collaboration at RHIC.\nFinally\, we provided predictions of
  the DLSA for the planned SPD experiment at NICA to estimate the expected 
 magnitude of this quantity. The predictions for the $A_{LL}$ have been don
 e recently for charmonium [Karpishkov\, Saleev\, 2026] and direct photon [
 Saleev\, Shipilova\, 2023]\n\nhttps://indico.particle.mephi.ru/event/626/c
 ontributions/6168/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6168/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rare four-leptonic decays of charged B-mesons with three charged l
 eptons in the final state
DTSTART;VALUE=DATE-TIME:20261030T071500Z
DTEND;VALUE=DATE-TIME:20261030T073000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6154@cern.ch
DESCRIPTION:Speakers: Dmitrii Ostapovich (P.N. Lebedev Physics Institute)\
 nWe revisit the decays $B^- \\to \\ell^+ \\ell^- \\bar{\\nu}_{\\ell'} \\el
 l'^-$ in both $\\ell \\neq \\ell'$ and $\\ell = \\ell'$ cases. Compared to
  our previous works\, new contributions to decay parameters are investigat
 ed. Non-zero lepton masses and interference terms are fully taken into acc
 ount. Excited resonances are included. The calculations are performed usin
 g the orthogonal amplitudes technique. Updated theoretical predictions for
  branching ratios and differential distributions are presented.\n\nhttps:/
 /indico.particle.mephi.ru/event/626/contributions/6154/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6154/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectroscopy of doubly bottom tetraquarks
DTSTART;VALUE=DATE-TIME:20261030T063000Z
DTEND;VALUE=DATE-TIME:20261030T064500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6155@cern.ch
DESCRIPTION:Speakers: Elena Savchenko (Federal Research Center ”Computer
  Science and Control”\, Russian Academy of Sciences  (FRC CSC RAS)\; Fac
 ulty of Physics\, Lomonosov Moscow State University (MSU))\nTetraquarks co
 ntaining two bottom quarks are studied in the framework of the relativisti
 c quark model based on the quasipotential approach and QCD. The tetraquark
  is considered as a bound state of a diquark and an antidiquark. The inter
 action quasipotential includes both spin-dependent and spin-independent re
 lativistic contributions. The finite size of the diquark is explicitly tak
 en into account. The obtained tetraquark masses are compared with the thre
 sholds of strong fall-apart decays into two mesons. States that may appear
  as narrow resonances in suppressed decay channels are identified.\n\nhttp
 s://indico.particle.mephi.ru/event/626/contributions/6155/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6155/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Correction to $CP$-asymmetry in $\\Upsilon(4S)$ decays due to the 
 admixture of $B^0 \\bar B^0$ in a $C$-even state
DTSTART;VALUE=DATE-TIME:20261030T070000Z
DTEND;VALUE=DATE-TIME:20261030T071500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6156@cern.ch
DESCRIPTION:Speakers: Natalia Panchenko ()\n$BB$ pairs from $\\Upsilon(4S)
 \\to BB$ decays are in $C$-odd state. However\, there is a small admixture
  of the $C$-even state and it modifies the time dependent $CP$-asymmetry. 
 The $C$-even component appears due to soft photon emission\, breaking the 
 pure $C$-odd nature of the initial state. Using the two-particle wave func
 tion formalism\, we derive analytical expressions for $CP$-asymmetry in bo
 th pure and mixed $C$-parity states. We emphasize the strong energy depend
 ence of the admixture magnitude.\n\nhttps://indico.particle.mephi.ru/event
 /626/contributions/6156/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6156/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum field-theoretic framework for neutrino decoherence
DTSTART;VALUE=DATE-TIME:20261030T073000Z
DTEND;VALUE=DATE-TIME:20261030T074500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6157@cern.ch
DESCRIPTION:Speakers: Konstantin Stankevich (Moscow State University)\nNeu
 trino oscillations probe quantum coherence over macroscopic distances and 
 are therefore sensitive to possible environmental and beyond-Standard-Mode
 l effects. While neutrino decoherence is often introduced phenomenological
 ly through Lindblad-type equations\, its microscopic origin requires a con
 sistent quantum field-theoretic treatment.\n\nWe present an open-system fr
 amework for neutrino propagation in which generalized master equations for
  the neutrino density matrix are derived from neutrino interactions with e
 xternal degrees of freedom. The formalism incorporates momentum-changing t
 ransitions and reproduces the standard Lindblad equation in suitable limit
 s. We consider three mechanisms of neutrino quantum decoherence: neutrino 
 decay\, elastic scattering in a medium\, and propagation in a fluctuating 
 classical axion-like-particle field. For neutrino decay\, the dissipative 
 terms are related to decay and inverse-decay widths\, allowing phenomenolo
 gical decoherence bounds to be translated into constraints on neutrino lif
 etimes. For elastic scattering\, the framework describes decoherence\, qua
 ntum-Zeno-like suppression of oscillations\, and possible effects of non-s
 tandard interactions or dark-sector particles. \n\nThe talk is based on ou
 r recent results\n\n[1] K.Stankevich\, A.Studenikin\, M.Vyalkov\, Quantum 
 field-theoretic framework for neutrino decoherence from scattering in a me
 dium\, Phys.Rev.D 114 (2026) 4.\n[2] A.Lichkunov\, K.Stankevich\, A.Studen
 ikin\, Neutrino quantum decoherence in a fluctuating ALPs field\, Phys.Rev
 .D 112 (2025) 12.\n[3] K.Stankevich\, A.Studenikin\, M.Vyalkov\, Generaliz
 ed Lindblad master equation for neutrino evolution\, Phys.Rev.D 111 (2025)
  3.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6157/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6157/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nonleptonic decays of Υ mesons
DTSTART;VALUE=DATE-TIME:20261030T064500Z
DTEND;VALUE=DATE-TIME:20261030T070000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6158@cern.ch
DESCRIPTION:Speakers: Ivan Sukhanov (Faculty of Physics\, M.V.Lomonosov Mo
 scow State University\; Federal Research Center "Computer Science and Cont
 rol"\, Russian Academy of Sciences)\nRecently the number of experimentally
  observed Υ mesons significantly increased. This opens the possibility to
  observe their weak decays. In this talk semi- and non-leptonic Υ decays 
 are studied within the framework of the relativistic quark model based on 
 the quasipotential approach and quantum chromodynamics. The form factors a
 re obtained and their dependence on the square of the transferred momentum
  is explicitly determined in the accessible kinematic range. On the basis 
 of these form factors and factorization approximation\, semi- and non-lept
 onic decay rates of the Υ mesons are calculated. The detailed comparison 
 with other theoretical results is given.\n\nhttps://indico.particle.mephi.
 ru/event/626/contributions/6158/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6158/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Open quantum systems approach in quantum field theory
DTSTART;VALUE=DATE-TIME:20261030T074500Z
DTEND;VALUE=DATE-TIME:20261030T080000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6160@cern.ch
DESCRIPTION:Speakers: Vladislav Motovilov (Lomonosov Moscow State Universi
 ty\, Faculty of Physics)\nThe standard paradigm of neutrino oscillations a
 ssumes that neutrinos propagate as a coherent superposition of mass eigens
 tates. However\, in a number\nof physical scenarios — including wave pac
 ket spreading\, quantum gravity effects\, spacetime fluctuations\, or inte
 ractions with a hot or dense medium —\nthis coherence can be violated\, 
 leading to the phenomenon of neutrino decoherence. Decoherence manifests i
 tself as an exponential damping of the interference\nterms in the oscillat
 ion probability and\, consequently\, can modify predictions\nfor oscillati
 on experiments. Searches for such effects are actively pursued using\ndata
  from reactor experiments (KamLAND\, Daya Bay\, RENO) and accelerator expe
 riments (MINOS/MINOS+\, T2K\, NOvA)\, and are also part of the\nphysics pr
 ogramme of future facilities such as JUNO and DUNE. The theoretical descri
 ption of decoherence naturally fits within the open quantum systems\nframe
 work\, where neutrinos are treated as a subsystem interacting with a quant
 um environment.\n\nIn this work\, the open quantum systems formalism is ap
 plied to the dynamics\nof neutrinos in a thermal bath of bosons at finite 
 temperature. Within the\nMarkov and secular approximations\, a reduced kin
 etic equation for the neutrino\ndensity matrix is derived from the von Neu
 mann equation for the total ”neutrino\n+ environment” system\, yieldin
 g a Lindblad-type master equation. It is shown\nthat the resulting equatio
 n naturally unifies coherent and dissipative processes:\nthe commutator te
 rm governs the unitary evolution\, including corrections to the\nHamiltoni
 an\, while the dissipative part describes incoherent processes associated\
 nwith neutrino decay and its inverse process in the medium.\n\nhttps://ind
 ico.particle.mephi.ru/event/626/contributions/6160/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6160/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon photon searches. VMD and mixing
DTSTART;VALUE=DATE-TIME:20261029T064500Z
DTEND;VALUE=DATE-TIME:20261029T070000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6148@cern.ch
DESCRIPTION:Speakers: Ivan Maslakov (Nikolaevich)\nWe investigate a model 
 with a gauge boson of the baryonic U(1)_B group.\n\nRelevance: Problems of
  dark matter and baryon asymmetry of the Universe\n\nObjectives:\n-Constru
 ction of the Lagrangian for baryon‑photon interactions with hadrons at e
 nergy scales typical of current detectors.\n-Calculation of the baryon‑p
 hoton production cross section in the main channels.\n-Estimation of the p
 arameters of visible decays.\n-Estimation of the sensitivity of current de
 tectors.\n\nMethods:\n-We derive the mixing form factors of the baryon‑p
 hoton with vector mesons from the chiral sigma model.\n-Low‑energy theor
 y (TiMoFey detector): within chiral theory\, we take into account resonanc
 es that contribute at the characteristic energy scale. We calculate the ba
 ryon‑photon production cross section in the main channels (πN and NN co
 llisions).\n-High‑energy theory: to calculate the production cross secti
 on in pp collisions at a higher energy scale\, we use the tensor pomeron e
 xchange notation. \n\nResults:\n-We determine the sensitivity of the TiMoF
 ey detector. \n-Also we consider general vector and axial vector particle 
 (coresponding to arbitrary U(1) group\, but not only baryon). We obtained 
 decay channels and nucleon vertexes for such models.\n\nPlans:\n-The sensi
 tivity of high-energy detectors will be determined in the near future with
  the approach of the interference exchange.\n\nhttps://indico.particle.mep
 hi.ru/event/626/contributions/6148/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6148/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brief review of using exact results of axial anomaly for studying 
 $\\gamma\\gamma^{(*)}$ and $\\gamma Z^{0}$ processes
DTSTART;VALUE=DATE-TIME:20261029T070000Z
DTEND;VALUE=DATE-TIME:20261029T071500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6149@cern.ch
DESCRIPTION:Speakers: Sergey Khlebtsov (NRC "Kurchatov Institute")\nIn thi
 s talk an overview is presented of a method based on the use of exact axia
 l anomaly relations for investigating transition form factors $\\pi^0\,\\e
 ta\,\\eta'\\rightarrow\\gamma\\gamma^{(*)}$ in the both space- and time-li
 ke regions. This method allows to examine the nonperturbative gluon matrix
  element $\\langle 0 |G\\tilde{G}|\\gamma\\gamma^{(*)} \\rangle$ and obtai
 n and describe main features of this matrix element. This method can be ap
 plied to study another processes\, like $\\pi^{0}\,\\eta\\rightarrow \\nu 
 \\bar{\\nu} \\gamma$ Dalitz decays.\n\nhttps://indico.particle.mephi.ru/ev
 ent/626/contributions/6149/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6149/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractal dimensions of nucleon\, nuclei and pion
DTSTART;VALUE=DATE-TIME:20261029T071500Z
DTEND;VALUE=DATE-TIME:20261029T073000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6150@cern.ch
DESCRIPTION:Speakers: Mikhail Tokarev ()\nA brief review of the z-scaling 
 concept for the analysis of hadron production over a wide range of hadron 
 and nuclear collision energies is given. The concept is based on the funda
 mental principles of self-similarity\, locality\, and the fractality of ha
 dron interactions. The notion of the fractal dimension of hadrons and nucl
 ei\, which is an important ingredient of the z-scaling concept\, is discus
 sed in the context of searching for new physics at small scales. In the z-
 scaling approach\, the hadron spectrum is described by the scaling functio
 n Ψ(z) as a function of the self-similarity variable z. This variable is 
 expressed via the momentum fractions of colliding particles and scattered 
 constituents fragmented to produce inclusive particles\, the structural an
 d fragmentation fractal dimensions\, the multiplicity density of negative 
 particles\, and a model parameter interpreted as the specific heat of the 
 produced medium. Properties of Ψ(z) including its energy\, angular\, mult
 iplicity\, and flavor independence\, are discussed. The shape of the scali
 ng function reveals a power law at low and high z. A microscopic scenario 
 of hadron production in terms of fractalons was given. The z-scaling schem
 e is used to study the dependence of momentum fractions and recoil mass on
  the collision energy\, transverse momentum\, and mass of the produced inc
 lusive particle.\n\nhttps://indico.particle.mephi.ru/event/626/contributio
 ns/6150/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6150/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New Solutions of RG Equations for α_s and y_{top}
DTSTART;VALUE=DATE-TIME:20261029T074500Z
DTEND;VALUE=DATE-TIME:20261029T080000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6152@cern.ch
DESCRIPTION:Speakers: Artur Fedoruk (MIPT)\nWe construct simple analytical
  solutions of RG equations for the running couplings $\\alpha_s$ and $y_{t
 op}$  in the asymptotic regime. These solutions have explicit form\, conta
 in only logarithms and no special functions and subsequently sum up the le
 ading\, subleading\, etc logarithms  in all orders of PT.  While the effec
 t of $y_{top}$ on the running of $\\alpha_s$ happens to be negligible\, th
 e role of $\\alpha_s$ on the running of $y_{top}$ is essential\, the accou
 nt of higher orders gives a noticeable  contribution.\n\nhttps://indico.pa
 rticle.mephi.ru/event/626/contributions/6152/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6152/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluon nature of multiparticle production
DTSTART;VALUE=DATE-TIME:20261029T063000Z
DTEND;VALUE=DATE-TIME:20261029T064500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6145@cern.ch
DESCRIPTION:Speakers: Elena Kokoulina (JINR)\nMultiparticle production sti
 ll attracts our attention. Simulation by using Monte Carlo event generator
 s is performed before planning any experiment. But it often overestimates 
 (or underestimates) experimental data.\nOf all multiparticle processes\, $
 e^+e^-$ annihilation is the theoretically cleanest\, proceeding via an int
 ermediate virtual photon or $Z^0$-boson followed by $q\\bar q$ pair creati
 on. QCD describes well the development of\n$q\\bar q$ cascade as marcovian
  branching process.\nThe transformation of quarks and gluons into observab
 le hadrons occurs at hadronization\, to which perturbation theory is no lo
 nger applicable. The choice of a scheme for it is based on experimental da
 ta. Convolution of cascade and hadronization allowed us to describe the mu
 ltiplicity. This model is called the gluon dominance model.\nSeveral decad
 es have passed since a series of e+e− annihilation experiments were\ncar
 ried out. The hadron and heavy ion research revealed many new results.\nTh
 at is why it appeared necessary to analyze multiplicity n e+e−-annihilat
 ion again\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6145
 /
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6145/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Development of a method for computing approximate solutions to lin
 ear evolution equations with application to the calculation of the heat ke
 rnel
DTSTART;VALUE=DATE-TIME:20261028T060000Z
DTEND;VALUE=DATE-TIME:20261028T061500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6137@cern.ch
DESCRIPTION:Speakers: Vyacheslav Guba ()\nWe propose a new method for comp
 uting approximate solutions of linear evolution equations with slowly vary
 ing coefficients. Using this method\, we obtain an expansion of the heat k
 ernel. We refer to this expansion as a derivative expansion because each s
 ubsequent term contains derivatives of the slowly varying coefficients of 
 a higher order than the previous one does. We also propose a new operator 
 approach for calculating the small-time asymptotic expansion of the heat k
 ernel. It is possible to derive a non-diagonal small-time expansion up to 
 an arbitrary order with this operator method. We explicitly obtain analyti
 cal expressions up to the second order in the time variable.\n\nhttps://in
 dico.particle.mephi.ru/event/626/contributions/6137/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6137/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Test of the Classicality Concept in Entangled States of Neutral Ps
 eudoscalar Mesons with the Aid of Three-Time Wigner Inequalities
DTSTART;VALUE=DATE-TIME:20261028T061500Z
DTEND;VALUE=DATE-TIME:20261028T063000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6138@cern.ch
DESCRIPTION:Speakers: Nikolai Nikitin (M.V.Lomonosov Moscow State Universi
 ty)\nThe classicality concept is formulated. It is used to derive Wigner i
 nequalities dependent on three instants. The possibility of testing experi
 mentally violations of these inequalities in pure and mixed flavor states 
 of a pair of neutral pseudoscalar mesons is studied. Within the Werner bac
 kground model\, it is shown that a violation of time-dependentWigner inequ
 alities may be observed even at a 50% fraction of background processes.\n\
 nhttps://indico.particle.mephi.ru/event/626/contributions/6138/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6138/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cutting equation is strong-field QED
DTSTART;VALUE=DATE-TIME:20261028T063000Z
DTEND;VALUE=DATE-TIME:20261028T064500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6139@cern.ch
DESCRIPTION:Speakers: Yuriy Selivanov ()\nThe cutting technique for Feynma
 n diagrams is a powerful tool for extracting implications of unitarity. It
  is widely used and referred to in various areas of quantum field theory\,
  including strong-field QED. However\, to the best of our knowledge\, no p
 roof of the cutting technique in the presence of a classical background fi
 eld has been published. In our presentation\, we follow M. Veltman's origi
 nal proof for self-acting scalar field theory and extend it to strong-fiel
 d QED with a stable vacuum. We also demonstrate the cutting equation on th
 e example of the second-order trident pair creation process and discuss pr
 ospects of it's future applications to non-perturbative strong-field QED.\
 n\nhttps://indico.particle.mephi.ru/event/626/contributions/6139/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6139/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized stress-tensor form factors in N = 4 SYM and dual confo
 rmal symmetry
DTSTART;VALUE=DATE-TIME:20261028T064500Z
DTEND;VALUE=DATE-TIME:20261028T070000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6140@cern.ch
DESCRIPTION:Speakers: Ekaterina Voropaeva (MIPT)\nWe compute the NMHV form
  factors of two stress-tensor operators in N=4 SYM at tree and one-loop le
 vel using unitarity methods. At tree level\, we analyze the general case u
 sing the BCFW recursion and identify dual conformal symmetry properties of
  such form factors. In addition\, we calculate the three-point form factor
 s by the CSW recursion and perform a numerical cross-check in Mathematica\
 , finding agreement up to machine precision. At one-loop level\, the three
 -point form factor is expressed in terms of triangle and box integrals. Ou
 r results expose dual conformal symmetry properties of such generalized fo
 rm factors in planar N=4 SYM\, which opens up the possibility for all loop
  analysis using integrability methods.\n\nhttps://indico.particle.mephi.ru
 /event/626/contributions/6140/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6140/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monopole dominance under influence of external magnetic fields
DTSTART;VALUE=DATE-TIME:20261028T070000Z
DTEND;VALUE=DATE-TIME:20261028T071500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6141@cern.ch
DESCRIPTION:Speakers: Masayasu Hasegawa (JINR\, BLTP)\nMonopoles and insta
 ntons play crucial roles in understanding quark confinement and chiral sym
 metry breaking in quantum chromodynamics. However\, their relationship rem
 ains unclear. In this research\, we perform Monte Carlo simulations in lat
 tice gauge theory to identify signatures of monopoles under the influence 
 of magnetic fields\, for example\, those generated in heavy-ion collision 
 experiments.\n\nIn collaboration with a research group at the University o
 f Pisa\, we set the parameters for the quark masses to the physical pion m
 ass and generate gauge field configurations with $N_{f}$ = 2 + 1 flavor qu
 arks in SU(3). We apply a uniform external magnetic field to the configura
 tions and vary its intensity.\n\nIn our previous study\, we reported on th
 e influence of the external magnetic field on monopoles\, quark confinemen
 t\, instantons\, chiral symmetry breaking\, and the eta-prime meson mass u
 sing these configurations.\n\nIn this study\, we define three contribution
 s — abelian\, monopole\, and photon — and construct three types of con
 figurations of the gauge fields corresponding to these contributions by su
 bjecting the configurations to Abelian projection after transforming the m
 atrices under the condition of the maximal Abelian gauge. These configurat
 ions are prepared for both the quark confinement phase and the quark decon
 finement phase.\n\nWe then calculate the low-lying eigenvalues and eigenve
 ctors of overlap fermions using the configurations. The overlap fermion re
 presents a quark formulation that preserves the exact chiral symmetry in l
 attice gauge theory.\n\nFinally\, we demonstrate that monopole dominance\,
  that is\, the numerical results of observables computed from the configur
 ations of the monopole contribution\, reasonably agree with the results co
 mputed from the normal configurations\, which are not transformed under an
 y gauge condition\, even in the presence of external magnetic fields.\n\nI
 n my presentation\, I will present the preliminary results.\n\nhttps://ind
 ico.particle.mephi.ru/event/626/contributions/6141/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6141/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inhomogeneous phases in phase diagram of various models
DTSTART;VALUE=DATE-TIME:20261028T071500Z
DTEND;VALUE=DATE-TIME:20261028T073000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6142@cern.ch
DESCRIPTION:Speakers: Roman Zhokhov (IHEP Protvino\, IZMIRAN Troitsk)\nThe
  QCD phase diagram at high baryon density and moderate temperature is expe
 cted to exhibit a rich phase structure beyond the possible first-order tra
 nsition. Inhomogeneous phases\, i. e. phases characterized by spatially mo
 dulated condensates\, is one of the most intriguing options. These phases\
 , such as the chiral density wave or crystalline condensates are studied a
 s a rule using model calculations\, for example\, in the framework of Namb
 u–Jona-Lasinio and quark-meson models. The studies indicate that the inh
 omogeneous region potentially covers the putative critical endpoint and co
 nnects the hadronic and quark-matter phases. Their presence can significan
 tly alter the phase structure and its experimental implications. The statu
 s of inhomogeneous phases will be briefly reviewed and new results in quar
 k matter with isospin and chiral imbalance will be discussed. The studies 
 in effective models have their own problems. So the study of low-dimension
 al models is critical in this context owing to their relative simplicity a
 nd renormalizability. The inhomogeneous phases are thoroughly studied in (
 1+1)-dimensional models. The search for such phases in (2+1)-dimensional m
 odels is a recent endeavor\, and current evidence suggests they are absent
 . We check this implication and then discuss (2+1)-dimensional models with
  one compactified spatial coordinate and study inhomogeneous phases in the
  crossover regime between these two low-dimensional models and found in wh
 at conditions the inhomogeneous phase is realized.\n\nhttps://indico.parti
 cle.mephi.ru/event/626/contributions/6142/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6142/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fermion AMM Contribution to Photon Polarization Operator in Extern
 al Electromagnetic Field
DTSTART;VALUE=DATE-TIME:20261028T073000Z
DTEND;VALUE=DATE-TIME:20261028T074500Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6143@cern.ch
DESCRIPTION:Speakers: Alexander Parkhomenko (P.G. Demidov Yaroslavl State 
 University)\nA tensor fermionic current is the part of the Pauli Lagrangia
 n density describing the electromagnetic interaction of fermions through t
 heir anomalous magnetic moment (AMM) induced by New Physics. Two-point vec
 tor-tensor and tensor-tensor correlators of fermionic currents are calcula
 ted in a constant homogeneous electromagnetic field background. Under assu
 mption that this interaction enters the effective QED Lagrangian\, the con
 tribution induced by AMM to the photon polarization operator is calculated
  and its impact is discussed.\n\nhttps://indico.particle.mephi.ru/event/62
 6/contributions/6143/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6143/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vogel Universality in 2D Yang–Mills Theory
DTSTART;VALUE=DATE-TIME:20261028T074500Z
DTEND;VALUE=DATE-TIME:20261028T080000Z
DTSTAMP;VALUE=DATE-TIME:20261023T110506Z
UID:indico-contribution-313-6144@cern.ch
DESCRIPTION:Speakers: Mikhail Sharov (Institute for Nuclear Research of th
 e Russian Academy of Sciences)\nWe study adjoint Wilson loops in two-dimen
 sional Yang--Mills theory for classical\, exceptional\, and $\\mathfrak{os
 p}(1|2n)$ Lie (super)algebras. The Wilson loops are evaluated numerically 
 using the Migdal representation-sum formula and compared across different 
 Lie families within Vogel's parametrization. Our main goal is to investiga
 te whether this observable admits a universal description on Vogel's plane
 \, including its large-rank expansion. We find substantial agreement betwe
 en different series at leading order in the algebra rank and obtain a comm
 on Vogel-based continuation that gives a good description of many exceptio
 nal-group results. Moreover\, the subleading corrections for different ser
 ies can be jointly parametrized by functions of the Vogel parameters. Thes
 e results provide evidence for a nontrivial Vogel-universal structure of a
 djoint Wilson loops\, at least in the large-rank limit.\n\nhttps://indico.
 particle.mephi.ru/event/626/contributions/6144/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6144/
END:VEVENT
END:VCALENDAR