Based on e+e− annihilation data collected with the BESIII detector at the BEPCII collider, searches for the (Formula presented.), and (Formula presented.) processes, as well as for the process (Formula presented.), are ffiffi conducted for the first time at √s = 4.750, 4.781, 4.843, 4.918, and 4.951 GeV. As no signals are observed for all the above channels, the upper limits on their Born cross sections at the 90% confidence level are reported. The obtained upper limits of cross sections for e+e− → ΣcΣ̄c are more than 2 orders of magnitude smaller than those for e+e− → Λ+c Λ̄−c near the threshold. In contrast, such suppression is absent in hyperon pair production (e+e− → ΛΛ̄ and ΣΣ̄), suggesting distinct underlying dynamics in charmed baryon production.
Measurements of the cross sections of e + e − → Σc ¯Σc and Λ +c ¯Σ −c near kinematic threshold
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2025-01-01
Abstract
Based on e+e− annihilation data collected with the BESIII detector at the BEPCII collider, searches for the (Formula presented.), and (Formula presented.) processes, as well as for the process (Formula presented.), are ffiffi conducted for the first time at √s = 4.750, 4.781, 4.843, 4.918, and 4.951 GeV. As no signals are observed for all the above channels, the upper limits on their Born cross sections at the 90% confidence level are reported. The obtained upper limits of cross sections for e+e− → ΣcΣ̄c are more than 2 orders of magnitude smaller than those for e+e− → Λ+c Λ̄−c near the threshold. In contrast, such suppression is absent in hyperon pair production (e+e− → ΛΛ̄ and ΣΣ̄), suggesting distinct underlying dynamics in charmed baryon production.| File | Dimensione | Formato | |
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bjr6-rrdc.pdf
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