Direct CP violation in Λb decays

被引：56

作者：

Hsiao, Y. K. ^{[1
,2
]}

Geng, C. Q. ^{[1
,2
,3
]}

机构：

[1] Natl Ctr Theoret Sci, Div Phys, Hsinchu 300, Taiwan

[2] Natl Tsing Hua Univ, Dept Phys, Hsinchu 300, Taiwan

[3] Chongqing Univ Posts & Telecommun, Chongqing 400065, Peoples R China

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.91.116007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study direct CP-violating asymmetries (CPAs) in the two-body Lambda(b) decays of Lambda(b) -> pM(V) with M(V) = K-(K*(-)) and pi(-)(rho(-)) based on the generalized factorization method in the standard model (SM). After simultaneously explaining the observed decay branching ratios of Lambda(b) -> (pK(-), p pi(-)) with R-pi K equivalent to B(Lambda(b) -> p pi(-))/B(Lambda(b) -> pK(-)) being 0.84 +/- 0.09, we find that their corresponding direct CPAs are (5.8 +/- 0.2, -3.9 +/- 0.2)%, in comparison with (-5(-5)(+26),-31(-1)(+43))% based on the perturbative QCD calculation and (-10 +/- 8 +/- 4, 6 +/- 7 +/- 3)% from the CDF experiment, respectively. For Lambda(b) -> (pK*(-), p rho(-)), the decay branching ratios and CPVs are predicted to be (2.5 +/- 0.5, 11.4 +/- 2.1) x 10(-6) with R-rho K* = 4.6 +/- 0.5 and (19.6 +/- 1.6, -3.7 +/- 0.3)%, respectively. The uncertainties for the CPAs in these decay modes as well as R-pi K,R-rho K*- mainly arise from the quark mixing elements and nonfactorizable effects, whereas those from the hadronic matrix elements are either totally eliminated or small. We point out that the large CPA for Lambda(b) -> pK*(-) is promising to be measured by the CDF and LHCb experiments, which is a clean test of the SM.

引用

页数：5

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