Sleptonic SUSY: from UV framework to IR phenomenology

Journal of High Energy Physics

Regular Article - Theoretical Physics

Raman Sundrum¹  Kaustubh Agashe¹  Zhen Liu²  Majid Ekhterachian³ 

[1] Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, 20742, College Park, MD, USA;School of Physics and Astronomy, University of Minnesota, 55455, Minneapolis, MN, USA;Theoretical Particle Physics Laboratory (LPTP), Institute of Physics, EPFL, Lausanne, Switzerland;

关键词: Supersymmetry;    Grand Unification;    Hierarchy Problem;    Models for Dark Matter;   

DOI  :  10.1007/JHEP09(2022)142

 received in 2022-04-05, accepted in 2022-08-28,  发布年份 2022

来源: Springer

【 摘 要 】

We study an attractive scenario, “Sleptonic SUSY”, which reconciles the 125 GeV Higgs scalar and the non-observation of superpartners thus far with potentially pivotal roles for slepton phenomenology: providing viable ongoing targets for LHC discovery, incorporating a co-annihilation partner for detectable thermal relic dark matter, and capable of mediating the potential muon g − 2 anomaly. This is accomplished by a modestly hierarchical spectrum, with sub-TeV sleptons and electroweakinos and with multi-TeV masses for the other new states. We study new elements in the UV MSSM realization of Sleptonic SUSY based on higher-dimensional sequestering and the synergy between the resulting gaugino-mediation, hypercharge D-term mediation and Higgs-mediation of SUSY-breaking, so as to more fully capture the range of possibilities. This framework stands out by harmoniously solving the flavor, CP and μ − Bμ problems of the supersymmetric paradigm. We discuss its extension to orbifold GUTs, including gauge-coupling and b-tau unification. We also develop a non-minimal model with extra Higgs fields, in which the electroweak vacuum is more readily cosmologically stable against decay to a charge-breaking vacuum, allowing a broader range of sleptonic spectra than in the MSSM alone. We survey the rich set of signals possible at the LHC and future colliders, covering both R-parity conservation and violation, as well as for dark matter detection. While the multi-TeV squarks imply a Little Hierarchy Problem, intriguingly, small changes in parameter space to improve naturalness result in dramatic phase transitions to either electroweak-preservation or charge-breaking. In a Multiverse setting, the modest unnaturalness may then be explained by the “principle of living dangerously”.

【 授权许可】

Unknown   
© The Author(s) 2022

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