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Measurements of Σ+ and Σ− time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV.
- Source :
-
Physics Letters B . Mar2021, Vol. 814, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- The Born cross sections of the e + e − → Σ + Σ ¯ − and e + e − → Σ − Σ ¯ + 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, | G E / G M | , 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANGULAR distribution (Nuclear physics)
*HYPERONS
*CENTER of mass
Subjects
Details
- Language :
- English
- ISSN :
- 03702693
- Volume :
- 814
- Database :
- Academic Search Index
- Journal :
- Physics Letters B
- Publication Type :
- Academic Journal
- Accession number :
- 148880730
- Full Text :
- https://doi.org/10.1016/j.physletb.2021.136110