Can electron and muon g-2 anomalies be jointly explained in SUSY?

被引：0

作者：

Li, Song ^{[1
,2
]}

Xiao, Yang ^{[1
,2
]}

Yang, Jin Min ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL C | 2022年 / 82卷 / 03期

基金：

中国国家自然科学基金;

关键词：

DARK-MATTER; HIGGS PHENOMENOLOGY; COMPUTATIONAL TOOL; MAGNETIC-MOMENT; PROGRAM; FLAVOR; MSSM; EXTENSIONS; SPHENO; MODEL;

D O I：

10.1140/epjc/s10052-022-10242-y

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The FNAL+BNL measurements for muon g - 2 is 4.2 sigma above the SM prediction, and the Berkeley Cs-133 measurement for the fine-structure constant alpha(em) leads to the SM prediction for electron g - 2 which is 2.4 sigma above the experimental value. Hence, a joint explanation of both anomalies requires a positive contribution to muon g - 2 and a negative contribution to electron g - 2, which is rather challenging. In this work we explore the possibility of such a joint explanation in the minimal supersymmetric standard model (MSSM). Assuming no universality between smuon and selectron soft masses, we find out a part of parameter space for a joint explanation at 2 sigma level, i.e., mu M-1, mu M-2 < 0, m(L1), m(E2) < 200 GeV, m(L2) being much larger than the soft masses of other sleptons, vertical bar M-1 vertical bar < 125 GeV and mu < 400 GeV. This part of parameter space can survive LHC and LEP constraints, but gives an over-abundance for dark matter if the bino-like lightest neutralino is assumed to be the dark matter candidate. With the assumption that the dark matter candidate is a superWIMP (say a pseudo-goldstino in multisector SUSY breaking scenarios, whose mass can be as light as GeV and produced from the late-decay of the thermally freeze-out lightest neutralino), the dark matter problem can be avoided. So, we conclude that the MSSM may give a joint explanation for the muon and electron g - 2 anomalies at 2 sigma level (the muon g - 2 anomaly can be even ameliorated to l sigma).

引用

页数：9

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