Gaugino masses from gravitino at one loop

TL;DR

This paper calculates the one-loop quantum effects of the gravitino on gaugino masses within supergravity, revealing a universal contribution that can alter mass relations and constrain gravitino mass.

Contribution

It provides a novel one-loop calculation of gravitino contributions to gaugino masses, highlighting their universality and impact on supersymmetry breaking models.

Findings

Gravitino contribution to gaugino masses is universal and independent of SM gauge couplings.

Gravitino effects can significantly modify gaugino mass relations.

Gravitino mass is constrained by gaugino mass measurements.

Abstract

The N=1 supergravity coupled to chiral and Yang-Mills superfields is regarded as the ultraviolet theory of the supersymmetric Standard Model. The gravitino acquires a mass from the hidden sector and participate in mediating supersymmetry breaking to the visible sector. We consider the quantum effects of the gravitino and evaluate its contribution to the gaugino masses at one loop level, which turns out to be irrespective of the SM gauge couplings. Due to the universality of gravitino, its contribution to the gaugino masses can significantly modify the gaugino mass relations of other supersymmetry breaking mechanisms depending on the gravitino mass. For a given gaugino mass the gravitino mass cannot be arbitrarily large even when other supersymmetry breaking mechanisms are dominant.