Observation of the Leptonic Decay D+ ??+??
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Dosyalar
Tarih
2019-11-22
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We report the first observation of D+??+?? with a significance of 5.1?. We measure B(D+??+??)=(1.20±0.24stat±0.12syst)×10-3. Taking the world average B(D+??+??)=(3.74±0.17)×10-4, we obtain R?/?=?(D+??+??)/?(D+??+??)=3.21±0.64stat±0.43syst., which is consistent with the standard model expectation of lepton flavor universality. Using external inputs, our results give values for the D+ decay constant fD+ and the Cabibbo-Kobayashi-Maskawa matrix element |Vcd| that are consistent with, but less precise than, other determinations.
Açıklama
Anahtar Kelimeler
Kaynak
Physical Review Letters
WoS Q Değeri
Q1
