Study of the D0 →k-μ+νμ Dynamics and Test of Lepton Flavor Universality with D0 →k- +ν Decays

Belle Collaboration

Результат исследования: Научные публикации в периодических изданияхстатья

9 Цитирования (Scopus)

Аннотация

Using e+e- annihilation data of 2.93 fb-1 collected at center-of-mass energy s=3.773 GeV with the BESIII detector, we measure the absolute branching fraction of D0→K-μ+νμ with significantly improved precision: BD0→K-μ+νμ=(3.413±0.019stat±0.035syst)%. Combining with our previous measurement of BD0→K-e+νe, the ratio of the two branching fractions is determined to be BD0→K-μ+νμ/BD0→K-e+νe=0.974±0.007stat±0.012syst, which agrees with the theoretical expectation of lepton flavor universality within the uncertainty. A study of the ratio of the two branching fractions in different four-momentum transfer regions is also performed, and no evidence for lepton flavor universality violation is found with current statistics. Taking inputs from global fit in the standard model and lattice quantum chromodynamics separately, we determine f+K(0)=0.7327±0.0039stat±0.0030syst and |Vcs|=0.955±0.005stat±0.004syst±0.024LQCD.

Язык оригиналаанглийский
Номер статьи011804
Число страниц8
ЖурналPhysical Review Letters
Том122
Номер выпуска1
DOI
СостояниеОпубликовано - 10 янв 2019

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