The decays B → Ψ(2S)π(K), ηc(2S)π(K) in the pQCD approach beyond the leading-order

被引：5

作者：

Zhang, Zhi-Qing ^{[1
]}

机构：

[1] Henan Univ Technol, Dept Phys, Zhengzhou 450052, Henan, Peoples R China

来源：

PHYSICS LETTERS B | 2017年 / 772卷

基金：

中国国家自然科学基金;

关键词：

QCD FACTORIZATION; CP VIOLATION; MESON;

D O I：

10.1016/j.physletb.2017.07.049

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Two body B meson decays involving the radially excited meson Psi(2S)/eta(c)(2S) in the final states are studied by using the perturbative QCD (pQCD) approach. We find that: (a) The branching ratios for the decays involving a K meson are predicted as Br(B+ -> Psi(2S)K+)=(5.37(-2.22)(+1.85)) x10(-4), Br(B-0 -> Psi(2S)K-0)=(4.98(-2.06)(+1.71)) x10(-4), Br(B+ -> eta(c)(2S)K+)=(3.54(-3.09)(+3.18)) x10(-4), which are consistent with the present data when the next-to-leading-order (NLO) effects are included. Here the NLO effects are from the vertex corrections and the NLO Wilson coefficients. The large errors in the decay B+ -> eta(c)(2S)K+ are mainly induced by using the decay constant f(eta c)(2S)= 0.243(-)(+0.079) (0.111) GeV with large uncertainties. (b) While there seems to be some room left for other higher order corrections or the non-perturbative long distance contributions in the decays involving a pi meson, Br(B+ -> Psi(2S)pi(+))=(1.17(-0.50)(+0.42)) x10(-5), Br(B-0 -> Psi(2S)pi(0)) = 0.54(-0.23)(+0.20)x10(-5), which are smaller than the present data. The results for other decays can be tested via running LHCb and forthcoming Super-B experiments. (c) There is no obvious evidence of the direct CP violation being seen in the decays B -> Psi(2S)pi(K),eta(c)(2S)pi(K) in the present experiments, which is supported by our calculations. If a few percent value is confirmed in the future, this would definitely indicate the existence of new physics. (C) 2017 The Author(s). Published by Elsevier B.V.

引用

页码：719 / 724

页数：6

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