Updated measurement of the branching fraction of Ds+??+??, via ?+ ? ?+(?)over-bar?
Küçük Resim Yok
Tarih
2023
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Amer Physical Soc
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This paper reports the study of D-s(+)->tau(+)nu(tau), via tau(+) -> pi(+)(nu) over bar (tau) using a boosted decision tree method, with 7.33 fb(-1) of e(+)e(-) collision data collected by the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV. The branching fraction of D-s(+)->tau(+)nu(tau) is determined to be (5.44 +/- 0.17(stat) +/- 0.13(syst))%. The product of the D-s(+) decay constant f(Ds+) and the Cabibbo-Kobayashi-Maskawa matrix element |V-cs| is f(Ds+) |V-cs| = (248.3 +/- 3.9(stat) +/- 3.1(syst) +/- 1.0(input) ) MeV. Combining with the |V-cs| value obtained from the Standard Model global fit or the f(Ds+) from the lattice quantum chromodynamics, we determine |V-cs| = 0.993 +/- 0.015(stat) +/- 0.012(syst) +/- 0.004(input) and f(Ds+) = (255.0 +/- 4.0(stat) +/- 3.2(syst) +/- 1.0(input) ) MeV. The first uncertainty is statistical, the second one is systematic and the third one is due to the input parameters, mainly the lifetime of Dthorns. All results obtained in this work supersede the BESIII previous results based on 6.32 fb(-1) of e(+)e(-) collision data taken at center-of-mass energies between 4.178 and 4.226 GeV.
Açıklama
Anahtar Kelimeler
Tof
Kaynak
Physical Review D
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
108
Sayı
9
