Do new data on [B+ -> tau+ nu_tau] decays point to an early discovery of supersymmetry at the LHC?

TL;DR

Recent measurements of B+ to tau+ nu_tau decays suggest potential early signs of supersymmetry at the LHC, constraining models and indicating specific parameter regions that could produce observable signals.

Contribution

The paper analyzes how new B+ to tau+ nu_tau decay data impacts supersymmetric models, identifying parameter regions compatible with observations and predicting early LHC signals.

Findings

Significant deviation from Standard Model in B+ to tau+ nu_tau measurements.

A small parameter space in the MSSM remains consistent with all constraints.

Predicted observable SUSY signals at early LHC runs, possibly at 7 TeV.

Abstract

The recent Belle and BaBar measurements of the branching ratio of $B^+ \to \tau^+ \nu_\tau$ indicate a significant deviation from the Standard Model prediction. We demonstrate that this measurement has a serious impact on models with minimal flavor violation involving a charged Higgs boson, ruling out a large portion of the currently-allowed parameter space. In the constrained minimal supersymmetric standard model, this creates a tension between the measurements of $B^+ \to \tau^+ \nu_\tau$ and the anomalous magnetic moment of the muon, unless $\tan\beta$ is small, $\mu > 0$, and $A_0$ takes a large negative value. In fact, a very small region of the parameter space of this model, with small values of $m_0$ and $m_{1/2}$, survives all the constraints at 95% C.L.. It is remarkable that this specific region is still consistent with the lightest supersymmetric particle as the dark matter. Moreover, it predicts observable SUSY signals in the early runs of the LHC, even perhaps at 7 TeV. We also show that a consistent explanation for the deviation of the $B^+ \to \tau^+ \nu_\tau$ branching ratio from the Standard Model can be achieved in a non-universal Higgs mass model, which could also predict early signals of supersymmetry at the LHC.