Peccei-Quinn violating minimal supergravity and a 126 GeV Higgs

TL;DR

This paper explores how Peccei-Quinn extensions of supergravity can enhance Higgs decay to photons and prefers axino dark matter over neutralino in light of collider and cosmological data.

Contribution

It provides a Bayesian analysis comparing three Peccei-Quinn supergravity scenarios, highlighting the viability of axino dark matter in these models.

Findings

Enhanced Higgs to gamma gamma rate in PQ-extended models

PQ-violating scenarios with axino dark matter are favored

Neutralino dark matter scenario is less viable under current constraints

Abstract

In a Peccei-Quinn extension of supergravity the h --> \gamma\gamma detection rate can be significantly enhanced due to the reduction of the total Higgs decay width. To assess the viability of various Peccei-Quinn extensions of minimal supergravity we perform a Bayesian analysis on three such scenarios. The main constraints on these models come from the currently observed Higgs boson like state by the Large Hadron Collider and from the WMAP observation of dark matter abundance. Our comparative study reveals that under these constraints the PQ violating scenarios with axino dark matter are clearly preferred over the minimal supegravity model with the lightest neutralino as a dark matter candidate.