Probing the supersymmetric inflaton and dark matter link via the CMB, LHC, and XENON1T experiments

Abstract

The primordial inflation dilutes all matter except the quantum fluctuations which we see in the cosmic microwave background (CMB) radiation. Therefore the last phases of inflation must be embedded within a beyond the Standard Model (SM) sector where the inflaton can directly excite the SM quarks and leptons. In this paper we consider two inflaton candidates L L e and u d d whose decay can naturally excite all the relevant degrees of freedom besides thermalizing the lightest supersymmetric particle (LSP) during and after reheating. In particular, we present the regions of the parameter space which can yield successful inflation with the right temperature anisotropy in the CMB, the observed relic density for the neutralino LSP, and the recent Higgs mass constraints from LHC within the MSSM with non-universal Higgs masses -referred to as the NUHM2 model. We found that in most scenarios, the LSP seems strongly mass degenerated with the next to lightest LSP (NLSP) and the branching ratio Bs → µ + µ − very close to the present bound, thus leading to falsifiable predictions. Also the dark matter interactions with XENON nuclei would fall within the projected range for the XENON1T experiment. In the case of a positive signal of low scale supersymmetry at the LHC, one would be able to potentially pin down the inflaton mass by using the associated values for the mass of the stau, the stop and the neutralino.

Naturalness of light neutralino dark matter in pMSSM after LHC, XENON100 and Planck data

“…All these new results have profound implications for a light neutralino scenario within the MSSM, and some of these aspects have already been investigated in a number of recent studies [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. The general conclusion is that light neutralino DM candidates with mass below about 15 GeV are severely constrained in generic MSSM scenarios (without gaugino mass unification).…”

TwInflation

“…2 Furthermore, for sufficiently low inflationary scales, we can have complementary terrestrial particle physics probes of inflation and reheating, such as at current and future collider experiments, see e.g. [35][36][37][38].…”

Light Higgsino dark matter in the MSSM on D-branes

“…One possible exception to this is the hyperbolic branch (HB)/focus point (FP) region of the mSUGRA/ CMSSM parameter space characterized by large m 0 in comparison to m 1 2 where the amount of required EWFT is minimized locally relative to the full parameter space with similar values of m 0 [43][44][45][46][47][48]. Several different groups have recently reassessed the status of mSUGRA/ CMSSM in light of the ∼125 GeV Higgs discovery [49][50][51][52][53][54][55][56][57][58][59][60][61][62] A consensus has built that the mSUGRA/CMSSM parameter space is being strongly constrained by this discovery and pushed into regions which require some degree of fine-tuning [63]. This has motivated the study of extensions of mSUGRA/CMSSM such as the non-universal Higgs mass models (NUHM) where the universality condition on the scalar soft masses of mSUGRA/CMSSM is relaxed such that the Higgs soft masses may be treated as independent parameters [61,[64][65][66][67].…”