Neutralino Dark Matter and Higgs mediated Lepton Flavor Violation in the Minimal Supersymmetric Standard Model

TL;DR

This paper investigates the potential for detecting Higgs-mediated lepton flavor violation in the minimal supersymmetric standard model with neutralino dark matter, considering experimental constraints and prospects at colliders and direct detection experiments.

Contribution

It provides a comprehensive analysis of LFV signals in the MSSM with large tanβ, heavy squarks, and heavy Higgs bosons, incorporating various experimental constraints and exploring detection prospects.

Findings

LFV rates are likely too small for future detection if relic density and g-2 are strictly enforced.

Relaxing relic density and g-2 constraints improves detection prospects.

Neutralino-nucleon cross section is just below current CDMS limits, with XENON100 probing significant parameter space.

Abstract

We consider the minimal supersymmetric standard model within a scenario of large $\tan\beta$ and heavy squarks and gluinos, with masses of the heavy neutral Higgs bosons below the TeV scale. We allow for the presence of a large, model independent, source of lepton flavor violation (LFV) in the slepton mass matrix in the $\tau-\mu$ sector by the mass insertion approximation. We constrain the parameter space using the $\tau$ LFV decays together with the $B$-mesons physics observables, the anomalous magnetic moment of the muon and the dark matter relic density. We further impose the exclusion limit on spin-independent neutralino-nucleon scattering from CDMS and the recent CDF limit from direct search of the heavy neutral Higgs at the TEVATRON. We re-examine the prospects for the detection of Higgs mediated LFV at LHC, at a photon collider and in LFV decays of the $\tau$ such as $\tau\to\mu\eta$, $\tau\to\mu\gamma$. We find rates probably too small to be observed at future experiments if models have to accommodate for the relic density measured by WMAP and explain the $(g-2)_{\mu}$ anomaly: better prospects are found if these two constraints are applied only as upper bounds. The spin-independent neutralino-nucleon cross section in the studied constrained parameter space is just below the present CDMS limit and the running XENON100 experiment will cover the region of the parameter space where the lightest neutralino has large gaugino-higgsino mixing.