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Bs→μ+μ-衰变对反常tcZ耦合的限制

发表时间:2013-08-15  浏览量:1236  下载量:338
全部作者: 李新强,杨亚东,袁兴博
作者单位: 河南师范大学物理与电子工程学院;华中师范大学粒子物理研究所,夸克与轻子物理教育部重点实验室
摘 要: 对反常tcZ耦合在纯轻衰变过程Bs→μ+μ-中的效应进行研究。通过对实验数据的分析得到了对有效反常耦合系数XLct的限制,并进一步给出了稀有衰变过程t→cZ的分支比的上限。对于一般的复耦合XLct,给出对Br(t→cZ)的间接限制和目前紧凑μ子线圈(compact muon solenoid,CMS)上直接探测的结果相容。特别地,对于反常耦合XLct为实数的情况,预言的上限为B(t→cZ)<1.0×10-4. 此结果远低于目前CMS给出的上限,但仍在大型强子对撞机(large hadron collider,LHC)的探测范围内。随着LHC实验测量精度的不断提高,t→cZ和Bs→μ+μ-衰变过程之间的关联将更加紧密。
关 键 词: 基本粒子物理学;反常tcZ耦合;数值分析;Bs介子;纯轻衰变;t→cZ
Title: Constraints on anomalous tcZ coupling from Bs→μ+μ- decay
Author: LI Xinqiang, YANG Yadong, YUAN Xingbo
Organization: College of Physics and Electronic Engineering, Henan Normal University; Key Laboratory of Quark & Lepton Physics, Ministry of Education, Institute of Particle Physics, Central China Normal University
Abstract: In this paper, the anomalous tcZ coupling effects in the pure leptonic Bs→μ+μ- decay are analyzed. After exploiting the available experimental data, constraints on the anomalous coupling XLct are derived, which are then used to set the upper limit for the branching ratio of rare t→cZ decay. For a general complex coupling XLct, the predicted upper bounds on B(t→cZ) are compatible with that from the recent compact muon solenoid (CMS) direct search. In particular, for the case of real coupling XLct, the upper bound is Br(t→cZ)<1.0×10-4, which is much lower than the current CMS bound but is still accessible at the large hadron collider (LHC). With improved precision of measurements made at the LHC, the closer correlations between the decays t→cZ and Bs→μ+μ- are expected in the near future.
Key words: elementary particle physics; anomalous tcZ coupling; numerical analysis; Bs meson; pure leptonic decays; t→cZ
发表期数: 2013年8月第15期
引用格式: 李新强,杨亚东,袁兴博. Bs→μ+μ-衰变对反常tcZ耦合的限制[J]. 中国科技论文在线精品论文,2013,6(15):1404-1410.
 
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