Interplay of Electroweak Precision Observables and B Physics Observables

TL;DR

This paper combines electroweak and B physics observables to constrain the scale of supersymmetry breaking within the CMSSM, finding a preference for a relatively low SUSY-breaking scale but noting some tension between different measurements.

Contribution

It performs a comprehensive chi^2 fit of CMSSM parameters using recent experimental data, integrating multiple observables to refine SUSY scale constraints.

Findings

Preference for a low SUSY-breaking scale consistent with dark matter data

Some tension observed between electroweak and B physics observables

Constraints support the viability of CMSSM with universal SUSY-breaking parameters

Abstract

Indirect information about the possible scale of supersymmetry (SUSY) breaking is provided by B physics observables (BPO) as well as electroweak precision observables (EWPO). We review the combination of the constraints imposed by recent measurements of the BPO BR(b -> s gamma), BR(B_s -> mu+ mu-), BR(B_u -> tau nu_tau) and Delta M_{B_s} with those obtained from the experimental measurements of the EWPO M_W, sin^2 theta_eff, Gamma_Z, (g-2)_mu and M_h. We perform a chi^2 fit to the parameters of the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which the SUSY-breaking parameters are universal at the GUT scale. Assuming that the lightest supersymmetric particle (LSP) provides the cold dark matter density preferred by WMAP and other cosmological data, we confirm the preference found previously for a relatively low SUSY-breaking scale, though there is some slight tension between the EWPO and the BPO.