Low mass neutralino dark matter in mSUGRA and more general models in the light of LHC data

TL;DR

This paper investigates the compatibility of low mass neutralino dark matter with LHC data, showing that generic models can reconcile both, unlike the constrained mSUGRA model which faces conflicts.

Contribution

It demonstrates that less constrained SUSY models can accommodate low mass neutralino dark matter consistent with LHC and WMAP data, unlike traditional mSUGRA.

Findings

mSUGRA strongly disfavours LMNDM due to LHC constraints

Generic phenomenological models can reconcile LMNDM with LHC data

Proposed models predict observable signals and are testable by dark matter experiments

Abstract

The $b\tau j \etslash$ signal at the ongoing LHC experiments is simulated with Pythia in the mSUGRA and other models of SUSY breaking. Special attention is given on the compatibility of this signature with the low mass neutralino dark matter (LMNDM) scenario consistent with WMAP data. In the mSUGRA model the above signal as well as the LMNDM scenario are strongly disfavoured due to the constraints from the on going SUSY searches at the LHC. This tension, however, originates from the model dependent correlations among the parameters in the strong and electroweak sectors of mSUGRA. That there is no serious conflict between the LMNDM scenario and the LHC data is demonstrated by constructing generic phenomenological models such that the strong sector is unconstrained or mildly constrained by the existing LHC data and parameters in the electroweak sector, unrelated to the strong sector,yield DM relic density consistent with the WMAP data. The proposed models, fairly insensitive to the conventional SUSY searches in the jets + $\etslash$ and other channels, yield observable signal in the suggested channel for $\lum \gsim 1 \ifb$ of data. They are also consistent with the LMNDM scenario and can be tested by the direct dark matter search experiments in the near future. Some of these models can be realized by non-universal scalar and gaugino masses at the GUT scale.