A comprehensive analysis of hadronic b → s transitions in a family non-universal Z′ model

被引：25
作者：
Chang, Qin [1 ,2 ,3 ]
Li, Xin-Qiang [2 ,3 ,4 ]
Yang, Ya-Dong [2 ,3 ]
机构：
[1] Henan Normal Univ, Inst Particle & Nucl Phys, Xinxiang 453007, Henan, Peoples R China
[2] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China
[3] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Hubei, Peoples R China
[4] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100080, Peoples R China
来源：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2014年 / 41卷 / 10期
基金：
中国国家自然科学基金; 高等学校博士学科点专项科研基金;
关键词：
B-physics; rare decays; beyond standard model; QCD FACTORIZATION; LAMBDA-L(+)L(-) DECAY; CP-VIOLATION; CONSTRAINTS; POLARIZATION; DIFFERENCE; PHI-PI(0); LAMBDA(B); SYMMETRY; E(+)E(-);
D O I：
10.1088/0954-3899/41/10/105002
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Motivated by the latest improved measurements of B-meson decays, we make a comprehensive analysis of the impact of a family non-universal Z' boson on B-s - (B) over bar (s) mixing and two-body hadronic B-meson decays, all being characterized by the quark-level b -> s transition. Explicitly 22 decay modes and the related 52 observables are considered, and some interesting correlations between them are also carefully examined. Firstly, the allowed oases of b - s - Z' coupling parameters |B-sb(L, R)| and phi(L, R)(s) are extracted from B-s - (B) over bar (s) mixing. Then, in the 'SM limit' (i.e., no new types of Z'-induced four-quark operators arise compared to the SM case), we study the Z' effects on B -> pi K, pi K* and rho K decays. It is found that a new weak phase phi(L)(s) similar to - 90 degrees is crucial for resolving the observed 'pi K CP puzzle' and the allowed cases of the other Z' coupling parameters are also strongly restricted. Moreover, the Z' effects on (B) over bar (s) -> KK, KK* and pi(0)phi decays, being induced by the same quark-level b -> sq (q) over bar (q = u, d) transitions, are also investigated. In particular, it is found that the decay (B) over bar (s) -> pi(0)phi, once measured, would play a key role in revealing the observed 'pi K CP puzzle' and probing possible new physics hints. Finally, to check the non-universality of Z' couplings to light-quark pairs, we have studied the B -> phi K decays in detail and found that the left-handed s - s - Z' coupling is different from the d - d - Z' one, which is due to the large A(CP)(dir)(B- -> phi K-) reported by the BaBar Collaboration.
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页数：29
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