Observation of the W -annihilation decay Ds+ ???+ and evidence for Ds+ ??K+
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Dosyalar
Tarih
2019-05-01
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Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We report the observation of W-annihilation decay Ds+???+ and evidence for Ds+??K+ in a data sample corresponding to an integrated luminosity of 3.19 fb-1 collected with the BESIII detector at a center-of-mass energy s=4.178 GeV. We obtain the branching fractions B(Ds+???+)=(1.77±0.32stat±0.13sys)×10-3 with a significance of 6.7? and B(Ds+??K+)=(0.87±0.24stat±0.08sys)×10-3 with a significance of 4.4?. This measurement provides critical information to determine the nonperturbative W-annihilation amplitudes and shows the potential of searching for CP asymmetry in Ds+??K+.
Açıklama
Anahtar Kelimeler
Kaynak
PHYSICAL REVIEW D
WoS Q Değeri
Q1
