Speaker:	Jason Evans (KIAS)
Title:	The Three Pillars of Supersymmetry
Date (JST):	Wed, Feb 07, 2018, 13:30 - 14:30
Place:	Seminar Room A
Abstract:	I will discuss the three main triumphs of supersymmetry: Naturalness, gauge coupling unification, and dark matter, with my focus being on the latter two. Although the naturalness of supersymmetry is a bit strained, gauge coupling unification is still quite good in supersymmetry. With the LHC pushing us to consider masses larger than a TeV, minimal supersymmetric SU(5) models give a sufficiently long lived proton. Since the viability of minimal supersymmetric SU(5) relies heavily on the scale at which supersymmetry is mediated, I will examine how things change if the supersymmetry breaking input scale is pushed beyond M_{GUT}. Although new constraints emerge, viable models can be found. I will also discuss the status of supersymmetric dark matter. With the well tempered neutralino all but ruled out, we must resort to exceptions to get the dark matter density thermally. Coannihilation among superpartners can push the dark matter mass beyond current experimental constraints. Two possible candidates for coannihilation in supersymmetry are the gluino and the stop. The gluino can coannihilate with a Bino of order 8 TeV and giving an acceptable dark matter candidate. Coannihilation with the stop is complicated by the Higgs mass calculation. In this extreme regime, the Higgs mass can not be reliable calculated making the extent of the stop strip unclear. However, sub-GUT models tend to have more stable Higgs masses along the coannihilation strip and so can give a 7 TeV mass Bino dark matter candidates.

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