Determination of f(+)(K) (0) and extraction of vertical bar V-cs vertical bar from semileptonic D decays

	Determination of f(+)(K) (0) and extraction of vertical bar V-cs vertical bar from semileptonic D decays
	Fang Y(方易); Rong G(荣刚); Ma HL(马海龙); Zhao JY(赵静宜); Fang, Y; Rong, G; Ma, HL; Zhao, JY
刊名	EUROPEAN PHYSICAL JOURNAL C
	2015
卷号	75 期号:1 页码:10
通讯作者	方易
英文摘要	By globally analyzing all existing measured branching fractions and partial rates in different four momentum transfer-squared q(2) bins of D -> Ke+v(e) decays, we obtain the product of the form factor and magnitude of Cabibbo-Kobayashi-Maskawa matrix element V-cs to be f(+)(K) (0)vertical bar V-cs vertical bar = 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 vertical bar V-cs vertical bar 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 chromo-dynamics (LQCD) recently, we extract vertical bar V-cs vertical bar (D -> Ke+ve) = 0.962 +/- 0.005 +/- 0.014, where the error is still dominated by the uncertainty of the form factor calculated in LQCD. Combining the vertical bar V-cs vertical bar(Ds+-> l+vl) = 1.012 +/- 0.015 +/- 0.009 extracted from all existing measurements of D-s(+) -> l(+)v(e) decays and vertical bar V-cs vertical bar(D -> Ke+ve) = 0.962 +/- 0.005 +/- 0.014 together, we find the most precisely determined vertical bar V-cs vertical bar to be vertical bar V-cs vertical bar = 0.983 +/- 0.011, which improves the accuracy of the PDG'2014 value vertical bar V-cs vertical bar(PDG/2014) = 0.986 +/- 0.016 by 45 %.
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
收录类别	SCI ; CA
WOS记录号	WOS:000348991600008
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228147]
专题	高能物理研究所_实验物理中心
推荐引用方式 GB/T 7714	Fang Y,Rong G,Ma HL,et al. Determination of f(+)(K) (0) and extraction of vertical bar V-cs vertical bar from semileptonic D decays[J]. EUROPEAN PHYSICAL JOURNAL C,2015,75(1):10.
APA	方易.,荣刚.,马海龙.,赵静宜.,Fang, Y.,...&Zhao, JY.(2015).Determination of f(+)(K) (0) and extraction of vertical bar V-cs vertical bar from semileptonic D decays.EUROPEAN PHYSICAL JOURNAL C,75(1),10.
MLA	方易,et al."Determination of f(+)(K) (0) and extraction of vertical bar V-cs vertical bar from semileptonic D decays".EUROPEAN PHYSICAL JOURNAL C 75.1(2015):10.