MSSM scenarios with a light CP-odd Higgs boson

Abstract

The possibility of the presence of a light pseudoscalar with the mass of 28 GeV in the MSSM Higgs sector extended by dimension-six operators is analyzed. The perturbative unitarity and vacuum stability constraints are discussed. Tree-level production cross sections of a light pseudoscalar in the process gg → µµbb−, and cross sections of a light pseudoscalar production in the topquark decay are evaluated for suitable benchmark points.

How heavy can dark matter be? Constraining colourful unitarity with SARAH

“…Unitarity of scattering amplitudes has long been used to constrain the masses and couplings of thermal relic dark matter (DM) particles [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. More generally, it is applied to constrain new physics Beyond the Standard Model such as Z couplings [5,13,[16][17][18], and most often (and relevant for this work) scalar couplings [10][11][12]14,15,[44][45][46][47][48][49] (including some one-loop calculations [44,[50][51][52]). Unitarity famously limits the maximum possible crosssection for dark-matter annihilation, and thus gives an upperbound on the mass of DM particles.…”