Splitting the Wino Multiplet by Higher-Dimensional Operators in Anomaly Mediation

TL;DR

This paper explores how higher-dimensional operators in anomaly-mediated supersymmetry breaking can significantly increase the Wino mass splitting from the minimal 170 MeV to a few GeV, revealing potential insights into high-scale physics.

Contribution

It demonstrates that within AMSB models, higher-dimensional operators can induce a much larger Wino mass splitting, linking it to the scale of new physics near the gravitino mass.

Findings

Wino mass splitting can reach a few GeV due to higher-dimensional operators.

The scale of new physics is comparable to the gravitino mass in these models.

Potential for experimental detection of larger mass gaps in Wino multiplets.

Abstract

In a class of AMSB models, the splitting in the Wino multiplet turns out to be very small, such as the often-quoted 170 MeV in minimal AMSB, which originates from MSSM loops. Such a small mass gap is potentially a window into higher scale physics, as it may be sensitive to higher-dimensional operators. We show that still within AMSB one can get a much larger splitting in the Wino multiplet--a few GeV--if the scale of the new physics is comparable to the gravitino mass (which is indeed often the scale of new physics in anomaly mediation).