Measurements of Σ+ and Σ time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV

BESIII Collaboration

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2 Scopus citations

Abstract

The Born cross sections of the e+e→Σ+Σ¯ and e+e→ΣΣ¯+ processes are determined for center-of-mass energy from 2.3864 to 3.0200 GeV with the BESIII detector. The cross section lineshapes can be described properly by a pQCD function and the resulting ratio of effective form factors for the Σ+ and Σ is consistent with 3. In addition, ratios of the Σ+ electric and magnetic form factors, |GE/GM|, are obtained at three center-of-mass energies through an analysis of the angular distributions. These measurements, which are studied for the first time in the off-resonance region, provide precision experimental input for understanding baryonic structure. The observed new features of the Σ± form factors require more theoretical discussions for the hyperons.

Original languageEnglish (US)
Article number136110
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume814
DOIs
StatePublished - Mar 10 2021
Externally publishedYes

Bibliographical note

Funding Information:
The BESIII collaboration thanks the staff of BEPCII and the IHEP computing center and the supercomputing center of USTC for their strong support. This work is supported in part by National Key Research and Development Program of China under Contracts Nos. 2020YFA0406300 , 2020YFA0406400 ; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11625523 , 11635010 , 11605196 , 11605198 , 11705192 , 11735014 , 11822506 , 11835012 , 11935015 , 11935016 , 11935018 , 11961141012 , 12022510 , 12035013 , 11950410506 , 12061131003 ; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U1732263 , U1832103 , U1832207 , U2032111 ; CAS Key Research Program of Frontier Sciences under Contract No. QYZDJ-SSW-SLH040 ; 100 Talents Program of CAS ; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology ; ERC under Contract No. 758462 ; European Union Horizon 2020 research and innovation programme under Contract No. Marie Sklodowska-Curie grant agreement No 894790 ; German Research Foundation DFG under Contracts Nos. 443159800 , Collaborative Research Center CRC 1044 , FOR 2359 , FOR 2359 , GRK 214 ; Istituto Nazionale di Fisica Nucleare , Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470 ; National Science and Technology fund ; Olle Engkvist Foundation under Contract No. 200-0605 ; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157 ; The Royal Society , UK under Contracts Nos. DH140054 , DH160214 ; The Swedish Research Council ; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374 , DE-SC-0012069 .

Funding Information:
The BESIII collaboration thanks the staff of BEPCII and the IHEP computing center and the supercomputing center of USTC for their strong support. This work is supported in part by National Key Research and Development Program of China under Contracts Nos. 2020YFA0406300, 2020YFA0406400; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11625523, 11635010, 11605196, 11605198, 11705192, 11735014, 11822506, 11835012, 11935015, 11935016, 11935018, 11961141012, 12022510, 12035013, 11950410506, 12061131003; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U1732263, U1832103, U1832207, U2032111; CAS Key Research Program of Frontier Sciences under Contract No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union Horizon 2020 research and innovation programme under Contract No. Marie Sklodowska-Curie grant agreement No 894790; German Research Foundation DFG under Contracts Nos. 443159800, Collaborative Research Center CRC 1044, FOR 2359, FOR 2359, GRK 214; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; Olle Engkvist Foundation under Contract No. 200-0605; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK under Contracts Nos. DH140054, DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374, DE-SC-0012069.

Publisher Copyright:
© 2021 The Author(s)

Keywords

  • BESIII
  • Cross section
  • Electromagnetic form factor
  • Σ hyperon

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