MSSM in view of PAMELA and Fermi-LAT

TL;DR

This paper explores the MSSM as a comprehensive low-energy theory including neutrino masses, analyzing how astrophysical data from PAMELA and Fermi-LAT constrain superpartner masses and the gravitino as dark matter.

Contribution

It provides a detailed analysis of MSSM parameter space consistent with astrophysical observations, linking neutrino physics, dark matter, and collider constraints.

Findings

Gravitino is the only viable dark matter candidate in this scenario.

Slepton masses can range from 500 TeV to 10^6 TeV to fit PAMELA data.

Fermi-LAT data suggest superpartners are too heavy for LHC detection.

Abstract

We take the MSSM as a complete theory of low energy phenomena, including neutrino masses and mixings. This immediately implies that the gravitino is the only possible dark matter candidate. We study the implications of the astrophysical experiments such as PAMELA and Fermi-LAT, on this scenario. The theory can account for both the realistic neutrino masses and mixings, and the PAMELA data as long as the slepton masses lie in the $500-10^6 $TeV range. The squarks can be either light or heavy, depending on their contribution to radiative neutrino masses. On the other hand, the Fermi-LAT data imply heavy superpartners, all out of LHC reach, simply on the grounds of the energy scale involved, for the gravitino must weigh more than 2 TeV. The perturbativity of the theory also implies an upper bound on its mass, approximately $6-7 $TeV.