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SUMMARY:A study of  nucleon and $\\Delta$ form factors with pion cloud eff
 ect
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261107T204312Z
UID:indico-contribution-6397@cern.ch
DESCRIPTION:Speakers: Yubing Dong (Institute of High Energy Physics\, Chin
 ese Academy of Sciences\, China)\n\\begin{document}\n\n\\title{Understandi
 ng of electromagnetic and gravitational form factors for nucleon and $\\De
 lta$ with pion meson cloud}\n\n\\newcommand{\\email}[1]{\\thanks{\\href{ma
 ilto:#1}{#1}}}\n\n\\author[a\,b]{Jiaqi Wang\\email{jqwang@ihep.ac.cn}}\n\\
 author[c]{Dongyan Fu\\email{fudongyan@impcas.ac.cn}}\n\\author[a\,b]{Yubin
 g Dong\\email{dongyb@ihep.ac.cn}}\n\n\\affil[a]{Institute of High Energy P
 hysics\, Chinese Academy of Sciences\,\nBeijing 100049\, China}\n\\affil[b
 ]{School of Physical Sciences\, University of Chinese Academy\nof Sciences
 \, Beijing 101408\, China}\n\\affil[c]{Southern Center for Nuclear-Science
  Theory (SCNT)\,\n\\authorcr\nInstitute of Modern Physics\, Chinese Academ
 y of Sciences\, Huizhou 516000\, China}\n\n\\maketitle\n\nThe electromagne
 tic and gravitational form factors of the nucleon and $\\Delta(1232)$ reso
 nance are studied\nsimultaneously using a covariant quark-diquark approach
 \, and the pion cloud effect on the form factors is\nexplicitly discussed.
  The calculated electromagnetic form factors of nucleon are compared to th
 e experimental\ndata in order to determine the parameters of our approach.
  Then\, the gravitational form factors of the\nnucleon and $Delta$-isobar 
 are evaluated with the same parameters\, and moreover\, the transition for
 m\nfactors of $N-\\Delta$ are also estimated. The electromagnetic and mech
 anical properties\, such as the\ncharge radii\, magnetic moments\, and mas
 s radii are presented. Moreover\, the D-term\, which is believed to be\nco
 nnected with the internal force inside the baryons\, is also discussed. It
  is found that our results\nare in reasonable agreement with the experimen
 t and lattice results\, and in particular\, our results suggest\nthat the 
 pion cloud contribution plays an indispensable role~\\cite{Wang:2026nlr\, 
 Wang:2024abv}\,\nespecially for the magnetic moments and the D-term of the
  systems\, and therefore the sign problem of the\npositive D-term in our p
 revious model calculations with quark-diquark approach is solved~\\cite{Wa
 ng:2023bjp\, Fu:2023ijy}.\n\n\\begin{thebibliography}{99}\n\\bibitem{Wang:
 2026nlr}\nWang\, Jiaqi and Fu\, Dongyan and Dong\, Yubing\,\n"Form factors
  of $\\Delta$(1232) and the electromagnetic $N-\\Delta$ transition"\, arXi
 v: 2602.19480.\n\n\\bibitem{Wang:2024abv} Wang\, Jiaqi and Fu\, Dongyan an
 d Dong\, Yubing\,\n"A systematic study of nucleon form factors with the pi
 on cloud effect"\, arXiv: 2410.14953\; Eur. Phys. J.  85\n1254 (2025).\n\n
 \\bibitem{Wang:2023bjp} Wang\, JiaQi and Fu\, Dongyan and Dong\, Yubing\, 
 "Form factors of decuplet baryons in\n    a covariant quark{\\textendash}d
 iquark approach"\, arXiv: 2311.07149\; Eur. Phys. J. C84\, 79 (2024).\n\n\
 \bibitem{Fu:2023ijy} Fu\, Dongyan and Wang\, JiaQi and Dong\, Yubing\, "Fo
 rm factors of {\\ensuremath{\\Omega}}-\nin a covariant quark-diquark appro
 ach"\, arXiv: 2306.04869\; Phys. Rev. D 108\, 076023 (2023).\n\n\\end{theb
 ibliography}\n\\end{document}\n\nhttps://indico.particle.mephi.ru/event/62
 6/contributions/6397/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6397/
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