Observation of Λc+ → Λa0 (980)+ and Evidence for ς (1380)+ in Λc+ → Λπ+η
Küçük Resim Yok
Tarih
2025
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Based on 6.1 fb-1 of e+e- annihilation data collected at center-of-mass energies from 4.600 to 4.843 GeV with the BESIII detector at the BEPCII collider, a partial wave analysis of Λc+→Λπ+η is performed, and branching fractions and decay asymmetry parameters of intermediate processes are determined. The process Λc+→Λa0(980)+ is observed for the first time, and evidence for the pentaquark candidate ς(1380)+ decaying into Λπ+ is found with statistical significance larger than 3σ with mass and width fixed to theoretical predictions. The branching fraction product B[Λc+→Λa0(980)+]B[a0(980)+→π+η] is determined to be (1.05±0.16stat±0.05syst±0.07ext)%, which is larger than theoretical calculations by 1-2 orders of magnitude. Here the third (external) systematic is from B(Λc+→Λπ+η). Finally, we precisely obtain the absolute branching fraction B(Λc+→Λπ+η)=(1.94±0.07stat±0.11syst)%. © 2025 authors. Published by the American Physical Society.
Açıklama
Anahtar Kelimeler
Asymmetry Parameter, Branching Fractions, Center-of-mass Energies, Statistical Significance, Theoretical Calculations, CenE+e- Annihilation
Kaynak
Physical Review Letters
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
134
Sayı
2
Künye
Ablikim, M., Achasov, M. N., Adlarson, P., Afedulidis, O., Ai, X. C., Aliberti, R., ... & Huang, K. X. (2025). Observation of Λ c+→ Λ a 0 (980)+ and Evidence for Σ (1380)+ in Λ c+→ Λ π+ η. Physical Review Letters, 134(2), 021901.
