The analysis of the latest most accurate experimental data on neutron decay for the possibility of the existence of a right vector boson $W_R$ was carried out. As a result of the analysis, it was found that there is an indication of the existence of a right vector boson $W_R$ with a mass of $M_{W_R }= 304_{-22}^{+28}$ GeV and a mixing angle with $W_L: \zeta = -0.038\pm{0.014}$. This result...
The SHiP (Search for Hidden Particles) experiment is a new fixed-target experiment to be installed at the CERN SPS ring with a 400 GeV proton beam energy. The primary goal of the experiment is to detect signals from the Hidden Sector particles, introduced to describe dark matter, baryon asymmetry, and small neutrino masses. To suppress background, an iron magnetized hadron absorber and a muon...
Search for Dark Matter (DM) particles is one of the most interesting problem in modern physics. Light dark matter particles may be produced in decays of the Higgs boson that would appear invisible to the detector.
"Higgs portal" models predict decay of Standard Model Higgs boson into pair of WIMP particles, which are strong candidates for DM. The production of Higgs Boson in vector boson...
Dark SHINE is a fixed-target experiment initiative at SHINE (Shanghai high repetition rate XFEL and extreme light facility, being the 1st hard X-ray FEL in China) under construction targeting completion in 2026. Dark SHINE aims to search for the new mediator, Dark Photon, bridging the Dark sector and the ordinary matter. In this work and presentation, we present the idea of this new project...
The goal of the Troitsk nu-mass experiment is a search for sterile neutrinos in the tritium beta decay. The decay electrons are produced in the windowless gaseous tritium source, WGTS. The magnetic field in the source is formed by a set of solenoids. Electrons produced at large pitch angles to the magnet axis are trapped. Electrons at small angles can leave the WGTS for the spectrometer or in...
Nuclotron complex gives the unique opportunity to study spin effects using polarized deuteron and proton beams from new polarized ion source. Recent results on the spin effects in deuteron-proton and proton-proton elastic scattering are discussed. The data on the deuteron analyzing powers Ay, Ayy and Axx obtained at large transverse momenta in the energy range 400-1800 MeV demonstrate...
Direct photons produced in quark-gluon and quark-antiquark interactions are planned to be studied in detail in the upcoming SPD experiment at the NICA collider. Direct photons serve as important probes for understanding the dynamics of interactions in high-energy nuclear collisions.
An important aspect for understanding the production of direct photons are parton distribution functions...
The first results on the polarization of inclusively produced $\Lambda$-hyperons in the $K^{-}$- and $\pi^{-}$-beams and $\bar{\Lambda}$-hyperons in the $\pi^{-}$-beam with a momentum of 26.5 GeV/$c$ were obtained at the SPASCHARM facility at the U-70 accelerator complex in Protvino. For the data on the $K^{-}$-meson beam, a noticeable positive polarization is observed in the region of large...
The ALICE collaboration is committed towards strongly interacting matter studies in proton-proton and heavy ion collisions at LHC, one of the characteristic observables of which are systematic measurements of quarkonia production with the future experiment of ALICE 3. Fast simulations for ALICE 3 showed that studies of charmonia states 1S ($J/\psi \to e^+e^-$) and 1P ($\chi_{cJ} \to J/\psi...
Indirect searches for new physics are possible through studies of Flavor-changing-neutral-current (FCNC) transitions in heavy flavor decays. Several recent results based on 13 TeV (Run-2) and 13.6 TeV (Run-3) pp collisions at the CMS experiment are reported.
CMS results on R(Jpsi) lepton flavor universality observable are reported using two channels of reconstruction of the tau lepton. The measurements use 13 TeV pp collision data from the LHC Run 2.
The narrow resonant-like structures were discovered by three main LHC collaborations (LHCb, ATLAS, CMS) in the di-Jpsi, Jpsi-Psi2S invariant mass spectra suggesting existence of the fully-heavy tetraquarks with a ccc(bar)c(bar) configuration. These new exotic resonances require detailed theoretical and experimental investigation. In this review, the latest experimental results and several...
A high statistics search for the $K^+\rightarrow\pi^0\pi^0\pi^0e^+\nu$ decay is performed by the OKA collaboration. No signal
is observed. Two other decays are also studied: $K^+\rightarrow\pi^0e^+\nu$ for normalization and $K^+\rightarrow\pi^0\pi^0e^+\nu$ for the
cross-check. The upper limit set is $BR(K^+\rightarrow\pi^0\pi^0\pi^0e^+\nu)<4.4\times 10^{-8}$ 90% CL, 80 times lower than the...
Stage 3 of ALICE experiment considers construction of fully new detector based on the novel silicon technologies. New apparatus will widen area of studies of hot and dense QCD matter produced in relativistic heavy-ion collisions for ALICE collaboration. Besides this it will highly improve precision of already obtained results also giving opportunity for differential studies. And one of the...
We present measurements of charmonia production cross sections in e+e- annihilation at center-of-mass energies from 3.81 GeV to 4.95 GeV at BESIII. The number of observed vector states in this energy region exceeds that of the predicted vector charmonium states. These features suggest that some of these supernumerary vector states are candidates of an exotic nature. To clarify the nature of...
A study of the hadrons production in $e^+e^-$ annihilation at low energies provides important information about interactions of light quarks and spectroscopy of their bound states.
Precise measurements of the total hadronic cross section, characterized by the ratio R, is needed for the calculation of the contribution of the hadronic vacuum polarization to the muon anomalous magnetic moment....
The Belle and Belle II experiments have collected a unique sample of data at centre-of-mass energies above the $\Upsilon(\text{4S})$ resonance. We present several results related to hadronic transitions between bottomonium states such as $\Upsilon(\text{5S}) \to \Upsilon(\text{1S,2S})\eta$, $\Upsilon(\text{5S, 10753}) \to \Upsilon(\text{1S,2S})\pi^+\pi^-$, $\Upsilon(\text{5S}) \to...
Latest CMS results on spectroscopy of beauty strange baryons are reported, including new decay modes and studies of excited states. The analyses use pp collision data at 13 TeV.
Decays of $B_c^+$ meson involving a charmonium resonance are studied. Both Run-2 and Run-3 pp collision data are used to improve the sensitivity and accuracy of the measurements.
Ref. arXiv:2404.15937 [hep-ph]
Neutral triple gauge couplings (nTGCs) are absent in the Standard Model (SM) and at the dimension-6 level in the Standard Model Effective Field Theory (SMEFT), arising first from dimension-8 operators. As such, they provide a unique window for probing new physics beyond the SM. These dimension-8 operators can be mapped to nTGC form factors whose structure is...
The main goal of modern experiments in high-energy-physics area is to find deviations from the Standard Model (SM), which describe data well but is expected to be extended to a more general theory. Anomalous coupling approach provides a possibility to look for a wide range of new physics effects in different experimental signatures thanks for its model-independence. In this work the neutral...
The most successful theory describing elementary particles, Standard Model (SM), can not explain some already observed phenomena, so it needs an extension. Any new observed manifestation of the new physics phenomenon brings the construction of a more general theory closer, since it provides new necessary information. The study reported in this talk contains an indirect model-independent way,...
Rare processes which occur via the electroweak interactions play a very important role among the vector boson production processes. Such processes are of interest both from the perspective of precision tests of the Standard Model, in particular for the investigation of the mechanism of electroweak symmetry breaking, and from the perspective of search for physics beyond the Standard Model via...
for the CPP/NPP collaboration
The electric and magnetic polarizabilities of a particle describe its
response to external electric and magnetic fields. The values of electric (alpha) and magnetic (beta) polarizabilities depend on the "stiffness" of the particle's constituent bonds and provide important information about its internal structure. As the lightest bound state of QCD, the pion's...
The muon component of the extensive atmospheric showers (EAS) is widely used in high-energy physics as a tool to study the processes of nucleus-nucleus interactions and decays of secondary particles. Information about muons with energies above 100 TeV can carry information about cosmic ray sources, as well as elements of “new physics”, so the task of measuring the energy spectrum of such muons...
The Highly Granular Neutron Detector (HGND) is designed for the BM@N experiment to study neutron emission in heavy ion collisions at beam energies up to 4A GeV. This detector allows the identification of neutrons and the reconstruction of their energies using time-of-flight method, facilitating the assessment of neutron yields and azimuthal flow. The challenging neutron energy range of $0.5-4$...
BM@N (Baryonic Matter at Nuclotron) is the first fixed target experiment collecting data at the NICA accelerator. The goal of BM@N physics program is a study of highly compressed nuclear matter in heavy ion beams. The Nuclotron provides heavy ion beams with energies from 2.3 to 4.5 AGeV, which is suitable for studies of strange mesons and multi–strange hyperons produced in nucleus-nucleus...
The Multi-Purpose Detector (MPD), currently under construction at the NICA complex at JINR, is designed to be the primary experiment for studying heavy-ion collisions in the energy range of $\sqrt{s_{NN}}$ =4−11 GeV. The MPD aims to explore the baryon-rich region of the QCD phase diagram to investigate the possible existence of a first-order phase transition and a critical end-point. The...
In high-energy hadronic collisions neutral meson spectra can be measured with high precision in a wide range of transverse momenta, providing valuable input for the nucleon structure functions parametrization and for studying in great detail the cold and hot matter effects.
The ALICE experiment at the LHC provides the possibility to measure photons in large acceptance EMCAL or precise PHOS...
