Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar
文献类型：期刊论文
| 作者 | Li, ZH; Zhu, N; Fan, XJ; Huang, T;黄涛(理)
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| 刊名 | JOURNAL OF HIGH ENERGY PHYSICS
 |
| 出版日期 | 2012 |
| 期号 | 5页码:160 |
| 关键词 | QCD Phenomenology NLO Computations |
| 英文摘要 | We present a QCD study on B, D -> pi semileptonic transitions at zero momentum transfer and an estimate of magnitudes of the associated CKM matrix elements. Light cone sum rules (LCSRs) with chiral correlator are applied to calculate the form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0). We show that there is no twist-3 and-5 component involved in the light-cone expansions such that the resulting sum rules have a good convergence and offer an understanding of these form factors at twist-5 level. A detailed O(alpha(s)) computation is carried out in leading twist-2 approximation and the (MS) over bar masses are employed for the underlying heavy quarks. With the updated inputs and experimental data, we have f(+)(B ->pi)(0) = 0.28(-0.02)(+0.05) and vertical bar V-ub vertical bar = (3.4(-0.6)(+0.2)+/- 0.1 +/- 0.1) x 10(-3); f(+)(D ->pi)(0) = 0.62 +/- 0.03 and vertical bar V-cd vertical bar = 0.244 +/- 0.005 +/- 0.003 +/- 0.008. As a by-product, a numerical estimate for the decay constant f(D) is yielded as f(D) = 190(-11)(+12) MeV. |
| 学科主题 | Physics |
| 收录类别 | SCI |
| WOS记录号 | WOS:000305238600080 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/224437]  |
| 专题 | 高能物理研究所_理论物理室 |
| 推荐引用方式 GB/T 7714 | Li, ZH,Zhu, N,Fan, XJ,et al. Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar[J]. JOURNAL OF HIGH ENERGY PHYSICS,2012(5):160. |
| APA | Li, ZH,Zhu, N,Fan, XJ,&Huang, T；黄涛.(2012).Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar.JOURNAL OF HIGH ENERGY PHYSICS(5),160. |
| MLA | Li, ZH,et al."Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar".JOURNAL OF HIGH ENERGY PHYSICS .5(2012):160. |
入库方式： OAI收割
来源：高能物理研究所
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