Determination of f(+)(pi)(0) or extraction of |V-cd| from semileptonic D decays
文献类型：期刊论文
| 作者 | Rong G(荣刚) ; Fang Y(方易); Ma HL(马海龙); Zhao JY(赵静宜); Rong, G; Fang, Y; Ma, HL; Zhao, JY
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| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2015 |
| 卷号 | 743页码:315-324 |
| 通讯作者 | 荣刚 |
| 英文摘要 | By globally analyzing all existing measured branching fractions for D --> pi e(+)nu(e) decays, partial decay rates in different four-momentum transfer-squared q(2) bins, as well as products of the decay form factor f(+)(pi)(q(2)) and the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix element \V-cd\, we obtain f(+)(pi)(0)\V-cd\ = 0.1428 +/- 0.0019(-0.0011)(+0.0019). This product, in conjunction with the \V-us\ determined from (semi-)leptonic Kdecays and the relation of \V-cd\ = \V-us\ = lambda from the unitarity of the CKM matrix, implies a value for the D --> pi semileptonic form factor f(+)(pi)(0) = 0.634(-0.010)(+0.012) +/- 0.002, which is consistent within error with those calculated in theory based on quantum chromodynamics (QCD). Alternately, using this product together with the most accurate form factor calculated in Lattice QCD (LQCD), we find \V-cd\(D-->pi e+nu e) = 0.2144(-0.0033)(+0.0040) +/- 0.0093. Combining this \V-cd\(D-->pi e+nu e) with \V-cd\(D+ --> mu+nu mu) = 0.2160 +/- 0.0049 +/- 0.0014 extracted from both the BESIII and CLEO-c measurements of D+ --> mu(+)nu(mu) decays, we find the most precisely extracted \V-cd\ to be \V-cd\ = 0.2157 +/- 0.0045 up to date. From these determined quantities we find [m(D+)f(+)(pi)(0)/f(D+)](exp) = 5.81 +/- 0.17, which is in excellent agreement with [m(D+)f(+)(pi)(0)/f(D+)](LQCD) = 5.85 +/- 0.26 calculated in LQCD, indicating that the LQCD approach to the charm quark sector is excellent. Using this \V-cd\ together with the PDG'2014 \V-ud\ and \V-td\, we check for the first column unitarity and find \V-ud\(2) + \V-cd\(2) + \V-td\(2) - 1 = -0.004 +/- 0.002, which deviates from unitarity by 2 sigma. (C) 2015 The Authors. Published by Elsevier B.V. |
| 学科主题 | Astronomy & Astrophysics; Physics |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields |
| 收录类别 | SCI ; CA |
| WOS记录号 | WOS:000352147500049 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/228315]  |
| 专题 | 高能物理研究所_实验物理中心 |
| 推荐引用方式 GB/T 7714 | Rong G,Fang Y,Ma HL,et al. Determination of f(+)(pi)(0) or extraction of |V-cd| from semileptonic D decays[J]. PHYSICS LETTERS B,2015,743:315-324. |
| APA | 荣刚.,方易.,马海龙.,赵静宜.,Rong, G.,...&Zhao, JY.(2015).Determination of f(+)(pi)(0) or extraction of |V-cd| from semileptonic D decays.PHYSICS LETTERS B,743,315-324. |
| MLA | 荣刚,et al."Determination of f(+)(pi)(0) or extraction of |V-cd| from semileptonic D decays".PHYSICS LETTERS B 743(2015):315-324. |
入库方式： OAI收割
来源：高能物理研究所
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