Two ultimate tests of constrained supersymmetry

TL;DR

This paper explores how measurements of rare B-meson decays and future dark matter detection experiments can test and distinguish between different supersymmetric models, especially the CMSSM and NUHM, beyond current collider capabilities.

Contribution

It identifies the potential of combining rare decay measurements and dark matter searches to constrain supersymmetric models and differentiate their favored regions.

Findings

Improved BR(Bs->) measurements can disfavor the A-funnel region in CMSSM.

Future dark matter detectors can test most CMSSM regions, revealing the nature of the neutralino.

NUHM shows less sensitivity to BR(Bs->) but can be constrained by dark matter signals.

Abstract

We examine the prospects of using two alternative and complementary ways to explore the regions that are favored by global constraints in two simple unified supersymmetric models: the CMSSM and the NUHM. First, we consider BR(Bs->\mu\mu), which has recently been for the first time measured by LHCb. In the CMSSM we show that ultimate, but realistic, improvement in the determination of the observable to about 5-10% around the Standard Model value would strongly disfavor the A-funnel region, while not affecting much the other favored regions. Second, we show that all the favored regions of the CMSSM will be, for the most part, sensitive to direct dark matter searches in future one-tonne detectors. A signal at low WIMP mass (<=450 GeV) and low spin-independent cross section would then strongly favor the stau coannihilation region while a signal at higher WIMP mass (~800 GeV to ~1.2 TeV) would clearly point to the region where the neutralino is higgsino-like with mass ~1 TeV. A nearly complete experimental testing of the CMSSM over multi-TeV ranges of superpartner masses, far beyond the reach of direct SUSY searches at the LHC, can therefore be achievable. In the NUHM, in contrast, similar favored regions exist but a sample study reveals that even a precise determination of BR(Bs->\mu\mu) would have a much less constraining power on the model, including the A-funnel region. On the other hand, this could allow one to, by detecting in one-tonne detectors a signal for 500 GeV<m_{\chi}<800 GeV, strongly disfavor the CMSSM.