Improved measurement of the decays ?? ??+?-?+ (0)?- (0) and search for the rare decay ?? ?4?0
Küçük Resim Yok
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Using a sample of 10 billion J/? events collected with the BESIII detector, the decays ????+?-?+?-, ????+?-?0?0 and ???4?0 are studied via the process J/?????. The branching fractions of ????+?-?+?- and ????+?-?0 ?0 are measured to be (8.56±0.25(stat)±0.23(syst))×10-5 and (2.12±0.12(stat)±0.10(syst))×10-4, respectively, which are consistent with previous measurements but with improved precision. No significant ???4?0 signal is observed, and the upper limit on the branching fraction of this decay is determined to be less than 1.24×10-5 at the 90% confidence level. In addition, an amplitude analysis of ????+?-?+?- is performed to extract the doubly virtual isovector form factor ? for the first time. The measured value of ?=1.22±0.33(stat)±0.04(syst), is in agreement with the prediction of the vector meson dominance model. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
Açıklama
Anahtar Kelimeler
Kaynak
Physical Review D
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
109
Sayı
3
