A Heavy SM-like Higgs and a Light Stop from Yukawa-Deflected Gauge Mediation

TL;DR

This paper explores a modified gauge mediation framework with Yukawa interactions that can naturally produce a 125 GeV Higgs, a light stop, and consistent electroweak symmetry breaking, reducing fine-tuning in supersymmetric models.

Contribution

It introduces a Yukawa-deflected gauge mediation model with Higgs-messenger couplings that achieves large stop mixing and a light stop while maintaining minimal flavor violation.

Findings

Yukawa mediation can generate large -A_t and stop mixing.

Minimal H-YGMSB struggles with electroweak symmetry breaking due to large m_{H_u}^2.

Modifications with strong gauge dynamics or (10,10_bar) messengers resolve the issues.

Abstract

To obtain a SM-like Higgs boson around 125 GeV in the Minimal Supersymmetric Standard Model with minimal gauge mediation of supersymmetry breaking (GMSB), a heavy stop at multi-TeV level is needed and incurs severe fine-tuning, which can be ameliorated in the framework of the deformed GMSB with visible-hidden direct Yukawa interactions (YGMSB). We examine some general features of the YGMSB and focus on the scenario with Higgs-messenger couplings (H-YGMSB) which can automatically maintain the minimal flavor violation (MFV). It turns out that such a Yukawa mediation scenario can give a large -A_t and -m_{stop_L,R}^2, leading to a maximal stop mixing, and thus can readily give a light stop (stop_1) below the TeV scale. However, we find that in the minimal H-YGMSB scenario, m_{H_u}^2 is too large and then the electroweak symmetry breaking is inconsistent with the large stop mixing. To solve this problem, we modify the hidden sectors in two ways, adding a new strong gauge dynamics or introducing the (10,10_bar) messengers. For each case we present some numerical study.