Global fits of the Non-Universal Higgs Model

TL;DR

This paper performs comprehensive global fits of the Non-Universal Higgs Model, mapping parameter spaces and observables, highlighting regions with bino-like and higgsino-like dark matter, and discussing experimental distinguishability from the CMSSM.

Contribution

It provides the first detailed global probability and profile likelihood maps for the NUHM, identifying the origin of higgsino-like regions and comparing observational signatures with the CMSSM.

Findings

Higgsino-like dark matter near 1 TeV with specific scattering cross sections identified.

Parameter space regions favoring bino-like or higgsino-like neutralinos mapped.

Most observational consequences are similar to the CMSSM, complicating experimental differentiation.

Abstract

We carry out global fits to the Non-Universal Higgs Model (NUHM), applying all relevant present-day constraints. We present global probability maps for the NUHM parameters and observables (including collider signatures, direct and indirect detection quantities), both in terms of posterior probabilities and in terms of profile likelihood maps. We identify regions of the parameter space where the neutralino dark matter in the model is either bino-like, or else higgsino-like with mass close to 1 TeV and spin-independent scattering cross section ~ 10^{-9}-10^{-8} pb. We trace the occurrence of the higgsino-like region to be a consequence of a mild focusing effect in the running of one of the Higgs masses, the existence of which in the NUHM we identify in our analysis. Although the usual bino-like neutralino is more prominent, higgsino-like dark matter cannot be excluded, however its significance strongly depends on the prior and statistics used to assess it. We note that, despite experimental constraints often favoring different regions of parameter space to the Constrained MSSM, most observational consequences appear fairly similar, which will make it challenging to distinguish the two models experimentally