Search for ηc (2S) →π+π-ηc and ηc (2S) →π+π- KS0 K±π∓ decays
Yükleniyor...
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American physical society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Based on (27.12 +/- 0.14) x 10(8) psi(2S) events collected by the BESIII detector, we search for the decay eta(c)(2S) -> pi(+)pi(-)eta(c) via psi(2S) -> gamma eta(c)(2S). No significant signal is observed, and the upper limit on the product branching fraction B(psi(2S) -> gamma eta(c) (2S)) x B(eta(c) (2S) -> pi(+)pi(-)eta(c)) is determined to be 2.21 x 10(-5) at the 90% confidence level. In addition, the eta(c)(2S) -> pi(+)pi(-KSK +/-)-K-0 pi(-/+) decay is studied via psi(2S) -> gamma eta(c)(2S) and is observed with a statistical significance of 10 sigma for the first time. The branching fraction of eta(c)(2S) -> pi(+)pi(-KSK +/-)-K-0 pi(-/+) is determined to be (1.33 +/- 0.11 +/- 0.40 +/- 0.95)x10(-2), where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the quoted B(psi(2S) -> gamma eta(c)(2S)).
Açıklama
Anahtar Kelimeler
Kaynak
Physical review d
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
109
Sayı
7
Künye
Ablikim, M., Achasov, M. N., Adlarson, P., Afedulidis, O., Ai, X. C., Aliberti, R., ... & Huang, G. S. (2024). Search for η c (2 S)→ π+ π-η c and η c (2 S)→ π+ π-KS 0 K±π∓ decays. Physical Review D, 109(7), 072017.
