Higgs funnel region of SUSY dark matter for small $\tan\beta$ and renormalization group effects on pseudoscalar Higgs boson with scalar mass non-universality

TL;DR

This paper investigates a non-universal scalar mass SUSY model where specific mass arrangements lead to a light Higgs spectrum and a bino dark matter candidate, compatible with relic density and detectable in future experiments.

Contribution

It introduces a scenario with non-universal scalar masses that naturally yields light Higgs and third-generation squarks, addressing naturalness and detection prospects.

Findings

Light Higgs spectrum due to RGE effects at small 

Bino-like LSP with relic density consistent with WMAP

Potential for detection in upcoming dark matter experiments

Abstract

A non-universal scalar mass supergravity type of model is explored where the first two generation of scalars and the third generation of sleptons may be very massive. Lighter or vanishing third generation of squarks as well as Higgs scalars at the unification scale cause the radiative electroweak symmetry breaking constraint to be less prohibitive. Thus, both FCNC/CP-violation problems as well as the naturalness problem are within control. We identify a large slepton mass effect in the RGE of $m_{H_D}^2$ (for the down type of Higgs) that may turn the later negative at the electroweak scale even for a small $\tan\beta$. A hyperbolic branch/focus point like effect is found for $m_A^2$ that may result in very light Higgs spectra. The lightest stable particle is dominantly a bino that pair annihilates via Higgs exchange, giving rise to a WMAP satisfied relic density region for all $\tan\beta$. Detection prospects of such LSPs in the upcoming dark matter experiments both of direct and indirect types (photon flux) are interesting. The Higgs bosons and the third generation of squarks are light in this scenario and these may be easily probed besides charginos and neutralinos in the early runs of LHC.