低能超对称中解释W玻色子质量和缪子反常磁矩实验测量结果| Science Bulletin

文章

20

22

速递

Low energy SUSY confronted with new measurements of W-boson mass and muon g−2

Jin-Min Yang, Yang Zhang

Science Bulletin, 2022, 67(14): 1430–1436

doi: 10.1016/j.scib.2022.06.007

简介

最近, CDF合作组利用CDF II数据测量得到的W玻色子质量与标准模型预言值有7个标准偏差(7σ)的偏离, 费米国家加速器实验室和布鲁克海文国家实验室测量的缪子反常磁矩也与标准模型预言有4.2σ的偏离, 这些实验结果强烈地暗示着超出标准模型新物理的存在. 本文通过探索最小超对称模型的参数空间, 研究了这2个实验结果对低能超对称模型的影响. 分析发现, 在考虑较大理论误差的情况下, 最小超对称模型可以在2σ水平的边缘同时解释这2个实验偏离并满足相关的对撞机和暗物质实验限制. 存活参数空间内, 超对称微子和标量陶轻子的质量简并, 标量顶夸克的质量在1 TeV附近, 处于LHC实验将来的探测范围内.

图文导读

Figure 1  The samples showing the exclusion of LHC direct searches. All these samples satisfy the constraints from the new CDF II measurement of , the combined FNAL and BNL muon g−2 results, the B-physics measurements, the SM-like Higgs mass requirement, the upper bound on DM relic density at 95% CL and the DM direct detection 90% CL limits.

Figure 2  The samples satisfying constraints from the combined FNAL and BNL muon g − 2 results, the B-physics measurements, the SM like Higgs mass measurement and the DM detections, with green bullets satisfying , , , , and  , namely the current LHC direct search constraints. We adopt 0.010 and 3 GeV theoretical uncertainties for W-boson mass and SM-like Higss mass calculations.

Figure 3  The samples satisfying constraints from the combined FNAL and BNL muon g − 2 results, the B-physics measurements, the SM-like Higgs mass measurement, the upper bound on DM relic density at 95% CL and the DM direct detection 90% CL limits. The green bullets further satisfy the current LHC direct search constraints. The horizontal and vertical solid, dashed and dot-dashed lines indicate the current experimental central values, 1σ and 2σ ranges of the corresponding observables.

Figure 4  Same as Fig. 1, but showing DM properties. The green samples satisfy all constraints including the LHC SUSY direct searches. The upper bound of color map in the left panel is manually set, and can reach to 200 GeV. In the right panel, the 90% CL exclusion limits from the XENON1T and the projected reach of LZ are also presented, and f indicates the ratio of the predicted relic density to the value observed by Planck.

通讯作者

杨金民 中国科学院理论物理研究所研究员. 主要研究超出标准模型的新物理理论和唯象.

张阳 郑州大学物理学院青年教师. 主要研究方向为超出标准模型的新物理唯象学研究.   

相关阅读

Gerry Bauer, Zhen Hu, Lei Wu, Kai Yi, Jingqing Zhang. High precision W mass measurement from CDF II conflicts with the Standard Model. Science Bulletin, 2022, 67(13):1313–1316， doi：10.1016/j.scib.2022.05.023

Xuewen Liu, Shu-Yuan Guo, Bin Zhu, Ying Li. Correlating gravitational waves with W-boson mass, FIMP dark matter, and Majorana seesaw mechanism. Science Bulletin, 2022, 67(14):1437–1442; doi: 10.1016/j.scib.2022.06.011

栏目介绍

论文 Article

报道具创新性和重要科学意义的最新科研成果(一般不超过10个印刷面，附250字左右摘要，4-6个关键词，图表不超过10个，参考文献不超过60条)。