Right-handed sneutrino dark matter and big-bang nucleosynthesis

TL;DR

This paper investigates how the decay of a long-lived MSSM-LSP in a supersymmetric model with right-handed sneutrino dark matter affects primordial element abundances, providing constraints on such models.

Contribution

It introduces a detailed analysis of light-element abundances considering MSSM-LSP decay effects in a right-handed sneutrino dark matter scenario.

Findings

Constraints on MSSM-LSP decay parameters from observed light-element abundances

Identification of non-standard nuclear reactions affecting nucleosynthesis

Implications for supersymmetric models with Dirac neutrino masses

Abstract

We study the light-element abundances in supersymmetric model where the right-handed sneutrino is the lightest superparticle (LSP), assuming that the neutrino masses are purely Dirac-type. In such a scenario, the lightest superparticle in the minimal supersymmetric standard model sector (which we call MSSM-LSP) becomes long-lived, and thermal relic MSSM-LSP may decay after the big-bang nucleosynthesis starts. We calculate the light-element abundances including non-standard nuclear reactions induced by the MSSM-LSP decay, and derive constraints on the scenario of right-handed sneutrino LSP.