2014/09/30 by Y. Fang, G. Rong, H. L. Ma +2 · 2 citations
Chemistry · Mathematics · Physics and Astronomy · #Analytical Chemistry (journal) #Cabibbo–Kobayashi–Maskawa matrix #Chemistry #Combinatorics #Electron #Geometry #High-Energy Particle Collisions Research #Lepton #Mathematics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Product (mathematics) #Quantum Chromodynamics and Particle Interactions #Quark #Semileptonic decay #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-014-3226-3
published as Eur. Phys. J. C (2015) 75:10
arxiv created 2014/12/12 · openalex publication_date 2015/01/01 · arxiv updated 2015/01/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
By globally analyzing all existing measured branching fractions and partial rates in different four momentum transfer-squared q2 bins of D→ Ke+ν e decays, we obtain the product of the form factor and magnitude of Cabibbo–Kobayashi–Maskawa matrix element Vcs to be f+K(0)|Vcs|=0.717± 0.004 . With this product, we determine the D→ K semileptonic form factor f+K(0)=0.737± 0.004± 0.000 in conjunction with the value of |Vcs| determined from the standard model global fit. Alternately, with the product together with the input of the form factor f+K(0) calculated in lattice quantum chromodynamics (LQCD) recently, we extract |Vcs|D→ Ke+ν e=0.962± 0.005± 0.014 , where the error is still dominated by the uncertainty of the form factor calculated in LQCD. Combining the |Vcs|Ds+→ ℓ +ν _ℓ =1.012± 0.015± 0.009 extracted from all existing measurements of D+s→ ℓ +ν _ℓ decays and |Vcs|D→ Ke+ν e=0.962± 0.005± 0.014 together, we find the most precisely determined |Vcs| to be |Vcs|=0.983± 0.011 , which improves the accuracy of the PDG’2014 value |Vcs|PDG'2014=0.986± 0.016 by 45 % .