Positively deflected anomaly mediation in the light of the Higgs boson discovery

TL;DR

This paper explores a modified anomaly-mediated supersymmetry breaking model that addresses the tachyonic slepton problem, aligns with the Higgs boson discovery, and predicts dark matter properties consistent with upcoming detection experiments.

Contribution

It introduces a positively deflected AMSB scenario that solves the tachyonic slepton issue and analyzes its phenomenological viability post-Higgs discovery.

Findings

Dark matter neutralino is Higgsino-like in most allowed regions.

Elastic scattering cross section is within future experimental reach.

Colored sparticles are heavy, making LHC detection challenging.

Abstract

Anomaly-mediated supersymmetry breaking (AMSB) is a well-known mechanism for flavor-blind transmission of supersymmetry breaking from the hidden sector to the visible sector. However, the pure AMSB scenario suffers from a serious drawback, namely, the tachyonic slepton problem, and needs to be extended. The so-called (positively) deflected AMSB is a simple extension to solve the problem and also provides us with the usual neutralino lightest superpartner as a good candidate for dark matter in the Universe. Motivated by the recent discovery of the Higgs boson at the Large Hadron Collider (LHC) experiments, we perform the parameter scan in the deflected AMSB scenario by taking into account a variety of phenomenological constraints such as the dark matter relic density and the observed Higgs boson mass around 125-126 GeV. We identify the allowed parameter region and list benchmark mass spectra. We find that in most of the allowed parameter regions, the dark matter neutralino is Higgsino-like and its elastic scattering cross section with nuclei is within the future reach of the direct dark matter search experiments, while (colored) sparticles are quite heavy and their discovery at the LHC is challenging.