Long-lived Charginos in the Focus-point Region of the MSSM Parameter Space

TL;DR

This paper investigates the conditions under which long-lived charginos can exist in the MSSM, focusing on the focus-point region where higgsino-like particles are nearly degenerate, leading to potential LHC signatures.

Contribution

It identifies the focus-point region of the MSSM parameter space as a viable area for long-lived charginos, highlighting the necessary mass degeneracy and fine-tuning conditions.

Findings

Long-lived charginos occur near the focus-point boundary in MSSM.

Production cross-sections at the LHC can reach a few tenths of pb.

Mass degeneracy of higgsino-like particles is essential for longevity.

Abstract

We analyse the possibility to get light long-lived charginos within the framework of the MSSM with gravity mediated SUSY breaking. We find out that this possibility can be realized in the so-called focus-point region of parameter space. The mass degeneracy of higgsino-like chargino and two higgsino-like neutralinos is the necessary condition for a long lifetime. It requires the fine-tuning of parameters, but being a single additional constraint in the whole parameter space it can be fulfilled in the Constrained MSSM along the border line where radiative electroweak symmetry breaking fails. In a narrow band close to the border line the charginos are long-lived particles. The cross-sections of their production and co-production at the LHC via electroweak interaction reach a few tenth of pb.