Bound States of Right-handed Sneutrino Dark Matter

TL;DR

This paper investigates how right-handed sneutrino dark matter can form bound states via light B-L Higgs exchange, leading to a Sommerfeld effect that ensures its relic abundance aligns with observations, making it a viable dark matter candidate up to 1.5 TeV.

Contribution

It demonstrates that non-perturbative effects significantly impact the relic abundance of right-handed sneutrino dark matter in B-L models, extending its viability as a dark matter candidate.

Findings

Bound states form through light B-L Higgs exchange.

Sommerfeld effect enhances relic abundance calculations.

Right-handed sneutrino remains viable dark matter up to 1.5 TeV.

Abstract

The relic abundance of the lightest right-handed sneutrino dark matter in supersymmetric B-L extension of the standard model is revisited. We argue that it can form a bound state through the exchange of light B-L Higgs boson and a large non-perturbative Sommerfeld effect is obtained. We emphasized that with this effect the relic abundance of right-handed sneutrino will lie within the observational limits and the right-handed sneutrino will remain a viable dark matter candidate of mass order up to 1.5 TeV.