TY - JOUR

T1 - Extracting the femtometer structure of strange baryons using the vacuum polarization effect

AU - BESIII

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - Финансирование: Финансирующий спонсор Номер финансирования Акроним Science and Technology Facilities Council Просмотр возможностей от STFC Shanghai Key Laboratory for Particle Physics and Cosmology Knut och Alice Wallenbergs Stiftelse Instituto Nazionale di Fisica Nucleare Institute of Nuclear and Particle Physics, Shanghai Jiao Tong University Suranaree University of Technology CAS Center for Excellence in Particle Physics Swedish Foundation for International Cooperation in Research and Higher Education Vetenskapsrådet UK Research and Innovation B16F640076 Chinese Academy of Sciences U1832207 Royal Society DH160214,DH140054 Deutsche Forschungsgemeinschaft 443159800,GRK 2149,CRC 1044,455635585,FOR5327 Deutsche Forschungsgemeinschaft 202301AT070162 National Natural Science Foundation of China 11635010,12192264,12025502,12035013,11935018,11961141012,12192260,11875115,11835012,12225509,12192261,11735014,12192263,12035009,12022510,12192265,11935015,12075250,12165022,11935016,12192262 U.S. Department of Energy DE-FG02-05ER41374, DPT2006K-120470 European Research Council 758462 National Key Research and Development Program of China 2020YFA0406300,2020YFA0406400 Просмотр возможностей от H2020 894790 Narodowe Centrum Nauki 2019/35/O/ST2/02907 Thailand Science Research and Innovation 160355, 200-0605 TSRI

PY - 2024/10/11

Y1 - 2024/10/11

N2 - One of the fundamental goals of particle physics is to gain a microscopic understanding of the strong interaction. Electromagnetic form factors quantify the structure of hadrons in terms of charge and magnetization distributions. While the nucleon structure has been investigated extensively, data on hyperons are still scarce. It has recently been demonstrated that electron-positron annihilations into hyperon-antihyperon pairs provide a powerful tool to investigate their inner structure. We present a method useful for hyperon-antihyperon pairs of different types which exploits the cross section enhancement due to the effect of vacuum polarization at the J/ψ resonance. Using the 10 billion J/ψ events collected with the BESIII detector, this allows a precise determination of the hyperon structure function. The result is essentially a precise snapshot of the Λ ¯ Σ 0 ( Λ Σ ¯ 0 ) transition process, encoded in the transition form factor ratio and phase. Their values are measured to be R = 0.860 ± 0.029(stat.) ± 0.015(syst.), Δ Φ Λ ¯ Σ 0 = ( 1.011 ± 0.094 ( stat. ) ± 0.010 ( syst. ) ) r a d and Δ Φ Λ Σ ¯ 0 = ( 2.128 ± 0.094 ( stat. ) ± 0.010 ( syst. ) ) r a d . Furthermore, charge-parity (CP) breaking is investigated in this reaction and found to be consistent with CP symmetry.

AB - One of the fundamental goals of particle physics is to gain a microscopic understanding of the strong interaction. Electromagnetic form factors quantify the structure of hadrons in terms of charge and magnetization distributions. While the nucleon structure has been investigated extensively, data on hyperons are still scarce. It has recently been demonstrated that electron-positron annihilations into hyperon-antihyperon pairs provide a powerful tool to investigate their inner structure. We present a method useful for hyperon-antihyperon pairs of different types which exploits the cross section enhancement due to the effect of vacuum polarization at the J/ψ resonance. Using the 10 billion J/ψ events collected with the BESIII detector, this allows a precise determination of the hyperon structure function. The result is essentially a precise snapshot of the Λ ¯ Σ 0 ( Λ Σ ¯ 0 ) transition process, encoded in the transition form factor ratio and phase. Their values are measured to be R = 0.860 ± 0.029(stat.) ± 0.015(syst.), Δ Φ Λ ¯ Σ 0 = ( 1.011 ± 0.094 ( stat. ) ± 0.010 ( syst. ) ) r a d and Δ Φ Λ Σ ¯ 0 = ( 2.128 ± 0.094 ( stat. ) ± 0.010 ( syst. ) ) r a d . Furthermore, charge-parity (CP) breaking is investigated in this reaction and found to be consistent with CP symmetry.

KW - cross section

KW - magnetization

KW - physics

KW - polarization

KW - baryon

KW - controlled study

KW - electron

KW - hadron

KW - parity

KW - vacuum

UR - https://www.mendeley.com/catalogue/9a108c17-4607-33ea-8cf6-7bc8c48c9d74/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85206479522&origin=inward&txGid=672dfa29c8879157c0b1deb6b80d2589

UR - https://pubmed.ncbi.nlm.nih.gov/39394218/

U2 - 10.1038/s41467-024-51802-y

DO - 10.1038/s41467-024-51802-y

M3 - Article

C2 - 39394218

VL - 15

SP - 8812

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

IS - 1

M1 - 8812

ER -