Non-Universalities in Pure Gravity Mediation

TL;DR

This paper explores how relaxing the assumption of universal Higgs soft masses in pure gravity mediation models broadens the parameter space, potentially enabling lower gravitino masses and new phenomenological signatures.

Contribution

It generalizes pure gravity mediation by introducing non-universality in Higgs soft masses, expanding viable parameter ranges and implications for low-energy signals.

Findings

Broader nd in n  eta with non-universal Higgs masses.

Viable solutions with lower gravitino masses become possible.

Connections to Higgs as Nambu-Goldstone bosons or no-scale structures.

Abstract

The simplest model of pure gravity mediation contains only two free parameters: the gravitino mass and \tan\beta. Scalar masses are universal at some high energy renormalization scale and gaugino masses are determined through anomalies and depend on the gravitino mass and the gauge couplings. This theory requires a relatively large gravitino mass (m_{3/2}\gtrsim 300\,TeV) and a limited range in \tan \beta \simeq 1.7--2.5. Here we generalize the theory to allow for non-universality in the Higgs soft masses. This introduces zero, one or two new free parameters associated with Higgs soft masses. This generalization allows us to greatly increase the allowed range in \tan \beta and it allows one to find viable solutions with lower m_{3/2}. The latter is important if we hope to find a low energy signal from gluinos. Some special cases of these non-universalities are suggestive of Higgs bosons as Nambu-Goldstone bosons or a partial no-scale structure for the Higgs doublets. Thus, we probe signatures at the weak scale and structures at the GUT and/or Planck scale.