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.
2025
112
9
1
16
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Ban, Y.; Bao, H.-R.; Batozskaya, V.; Beg...espandi
File in questo prodotto:
File Dimensione Formato  
bjr6-rrdc.pdf

Accesso aperto

Dimensione 1.14 MB
Formato Adobe PDF
1.14 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2117915
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact