Precision gaugino mass measurements as a probe of large trilinear soft terms at ILC

TL;DR

This paper explores how precise measurements of gaugino masses at the ILC can reveal the presence of large trilinear soft SUSY breaking terms, which are linked to the Higgs mass and naturalness.

Contribution

It demonstrates that high-precision electroweak-inos mass measurements at ILC can serve as indirect probes of large trilinear soft SUSY breaking parameters.

Findings

Gaugino mass measurements at ILC can reach percent-level precision.

Such measurements can indirectly indicate large A-terms in SUSY models.

The approach assumes gaugino mass unification.

Abstract

In supersymmetric models with radiatively-driven naturalness, higgsino-like electroweak-inos (EW-inos) are expected to lie in a mass range 100--300 GeV, the lighter the more natural. Such states can be pair-produced at high rates at ILC where their masses are nearly equal to the value of the superpotential mu parameter while their mass splittings depend on the gaugino masses M_1 and M_2. The gaugino masses in turn depend on trilinear soft terms---the A parameters, which are expected to lie in the multi-TeV range owing to the 125 GeV Higgs mass---via two-loop contributions to renormalization group running. We examine the extent to which ILC is sensitive to large A-terms via precision EW-ino mass measurement. Extraction of gaugino masses at the percent level should allow for interesting probes of large trilinear soft SUSY breaking terms under the assumption of unified gaugino masses.