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(Seminar) The dark matter implications of two scenarios with light scalars within the MSSM
2019-07-25  【 】【打印】【關閉

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Seminar

Title

題目

The dark matter implications of two scenarios with light scalars within the MSSM

Speaker

報告人

Christopher Kelso

Affiliation

所在單位

University of North Florida,  USA

Date

日期

2019年7 月 25 日(周四)下午 4:00

Venue

地點

ITP South Building 6620

Abstract

摘要

Experimental results from the LHC have placed strong constraints on the masses of colored superpartners. The MSSM parameter space is also constrained by the measurement of the Higgs boson mass, and the requirement that the relic density of lightest neutralinos be consistent with observations. Although large regions of the MSSM parameter space can be excluded by these combined bounds, leptophilic versions of the MSSM can survive these constraints. We consider a scenario in which the requirements of minimal flavor violation, vanishing CP-violation, and mass universality are relaxed, specifically focusing on scenarios with light sleptons. We find a large region of parameter space, analogous to the original bulk region, for which the lightest neutralino is a thermal relic with an abundance consistent with that of dark matter. We find that these leptophilic models are constrained by measurements of the magnetic and electric dipole moments of the electron and muon, and that these models have interesting signatures at a variety of indirect detection experiments.  We also consider a related scenario in which dark matter is bino-like and darkmatter-nucleon spin-independent scattering occurs via the exchange of light squarks which exhibit left-right mixing. We show that direct detection experiments such as LUX and SuperCDMS will be sensitive to a wide class of such models through spin-independent scattering. Moreover, these models exhibit properties, such as isospin violation, that are not typically observed for the MSSM LSP if scattering occurs primarily through Higgs exchange. The dominant nuclear physics uncertainty is the quark content of the nucleon, particularly the strangeness content.

Contact Person

所內聯系人

杨金民  李田军

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