Long-lived bino and wino in supersymmetry with heavy scalars and higgsinos

TL;DR

This paper identifies a parameter space in supersymmetry with heavy scalars and higgsinos where bino and wino particles become long-lived, leading to unique collider signatures due to their small mixings and extended lifetimes.

Contribution

It introduces a new parameter region in supersymmetry where bino and wino are long-lived due to heavy higgsinos, providing decay formulas and collider implications.

Findings

Heavy higgsinos suppress bino and wino mixing.

Bino and wino can have extended lifetimes in this scenario.

Distinct collider signatures arise from long-lived electroweak gauginos.

Abstract

We point out that there is a parameter region in supersymmetry with heavy scalars and higgsinos, in which the heavier of bino and wino becomes long-lived as a consequence of the heavy higgsinos. In this region these electroweak gaugino sectors are secluded from each other with very small mixings that are inversely proportional to the higgsino mass. We revisit the bino and bino decays and provide simple formulae for the partial decay rates and the lifetimes in the limit of heavy higgsinos. We discuss the collider signatures of the long-lived binos and winos in this scenario.