2018/09/20 by Park, Jae-hyeon
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.1809.07774
In the high-scale (split) MSSM, the measured Higgs mass sets an upper bound on the supersymmetric scalar mass scale MSUSY around 1011 (108) GeV, for tanβ in the standard range and the central value of the top quark mass mt. This article discusses how maximal MSUSY is affected by negative threshold corrections to the quartic Higgs coupling arising from the sbottom and stop trilinear couplings. In the high-scale MSSM with very high tanβ, the electroweak vacuum decay due to the large bottom Yukawa coupling rules out the possibility of raising MSUSY beyond the above limit. In cases with large Ab or At, MSUSY as a common mass of the extra fermions and scalars can be as high as 1017 GeV remaining consistent with mh and the vacuum longevity if mt is smaller than the central value by 2σ. For the central value of mt, the upper limit on MSUSY does not change very much owing to the metastability, which is the case also in the split MSSM even with ± 2σ variations in mt.