Smuon contribution to muon g-2 in Grand Unified supersymmetric theories

Li, Weichao; Qiao, Haoxue; Wang, Kun; Zhu, Jingya

Smuon contribution to muon g-2 in Grand Unified supersymmetric theories

Dec 29, 2023

12 pages

e-Print:

2312.17523 [hep-ph]

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Abstract: (arXiv)

In GUT-scale constrained (GUTc) supersymmetric (SUSY) models, the mass of smuon

\tilde{\mu}_1

is typically heavier than that of stau

\tilde{\tau}_1

, and stau co-annihilation is a typical annihilation mechanism of dark matter. However, light smuon is more favored by the muon

g-2

anomaly, thus smuon-neutralino loop contribution to muon

g-2

is usually smaller than that of sneutrino-chargino. Inspired by the latest muon

g-2

results, we take the GUTc- Next-to-Minimal Supersymmetric Model (NMSSM) as an example, where the gaugino (Higgs) masses are not unified to the usual parameter

M_{1/2}

(

M_0

), exploring its possibility of light smuon and its contribution to muon

g-2

. After complicated calculations and discussions, we conclude that in GUTc-NMSSM the smuon can be lighter than stau. In this light-smuon scenario, the contribution of smuon-neutralino loop to the muon

g-2

can be larger than that of the sneutrino-chargino loop. The annihilation mechanisms of dark matter are dominated by multiple slepton or chargino co-annihilation. In our calculations, we consider also other latest related constraints like Higgs data, SUSY searches, dark matter relic density and direct detections, etc.

Note:

12 pages, 5 figures

new physics
grand unified theory
supersymmetry
minimal supersymmetric standard model
muon: magnetic moment
magnetic moment: anomaly
smuon: mass
stau: mass
dark matter: relic density
dark matter: annihilation

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