当前实验对受限超对称模型中最轻希格斯玻色子质量的限制.docVIP

当前实验对受限超对称模型中最轻希格斯玻 色子质量的限制 曹俊杰1,2*，衡朝霞1，李东玮1，杨金民3 1 河南师范大学物理与信息工程学院，新乡　 453007 2 北京大学高能物理研究中心，北京　 100871 3 中国科学院理论物理研究所，北京 100190 摘要：本文在系统考虑各种实验限制条件下，研究一些受限超对称模型中最轻 Higgs 粒子的质 量。考虑的实验限制包括暗物质残留密度、暗物质直接探测实验结果（XENON100 实验）、来 自 LEP、Tevatron 和 LHC 寻找 Higgs 及超对称粒子的实验结果、μ 的反常磁矩以及低能味物 理限制。对于味物理过程 Bs → μ+μ?，分别考虑两种限制条件：1、LHCb 的直接观测结果； Br(Bs→μ+μ?)/Br(Bμ→τ ντ ) Br(Ds→τ ντ )/Br(D→τ μτ ) 和 NUHM2 模型中最轻的希格斯玻色子 (h) 的质量上限均为 124GeV，并且在这些模型中， LHC 上希格斯玻色子的双光子信号相较于标准模型的预言值都被压低了，而超顶夸克的质量 下限则随希格斯质量增加而抬高，当 mh = 124 GeV，达到 600GeV。 关键词：希格斯质量；受限的最小超对称；LHC 中图分类号： O572.25 Current experimental constraints on the lightest Higgs boson mass in the constrained MSSM CAO Jun-Jie1,2*, HENG Zhao-Xia1, LI Dong-Wei1,YANG Jin-Min3 1 2 Department of Physics, Henan Normal University, Xinxiang 453007,China Center for High Energy Physics, Peking University, Beijing 100871,China 3 State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Academia Sinica, Beijing 100190,China Abstract: In this work , the parameter space of the constrained MSSM is examined by considering various experimental constraints. For the dark matter sector, the neutralino dark matter is required to account for the relic density measured by the WMAP and satisfy the XENON limits on its scattering rate with the nucleon. For the collider constraints, all relevant direct and indirect limits has been considered,such as from LEP, Tevatron and LHC as well as the muon anomalous magnetic moment. Especially, for the limits from Bs → μ+μ?, its branching ratio is either directly considered with the latest LHC data or alternatively considered the double ratio of the purely leptonic decays de?ned by Br(Bs→μ+μ?)/Br(Bμ→τ ντ ) Br(Ds→τ ντ )/Br(D→τ μτ ) 。 基金项目： NNSFC Foundation ，SRFDP Foundation (20104104110001) 作者简介： Cao Jun-Jie（1974-），male，professor，major research direction：Collider Physics. -1- Under these constraints, the lightest Higgs boson (h) in the CMSSM and NUHM2 is upper bounded by 124 GeV. For thes