The 7 TeV LHC Reach for MSSM Higgs Bosons

TL;DR

This paper evaluates the Large Hadron Collider's potential to discover MSSM Higgs bosons at 7 TeV, focusing on low and high mass regions, and explores alternative search strategies and scenarios with enhanced detection prospects.

Contribution

It provides a detailed analysis of the LHC's reach for MSSM Higgs bosons at 7 TeV, including alternative search channels and scenarios with enhanced signals.

Findings

LHC can probe high Higgs mass regions (>140 GeV) effectively.

Low mass Higgs detection is challenging but possible with combined strategies.

Certain MSSM scenarios may enhance the Higgs detection rate in upcoming runs.

Abstract

The search for the Higgs boson is entering a decisive phase. The Large Hadron Collider experiments have collected more than 1 fb$^{-1}$ of data and are now capable of efficiently probing the high Higgs mass region, $m_H > 140$ GeV. The low mass region is more challenging at the LHC, but if the Higgs has Standard Model (SM)-like properties, the LHC should find evidence for it by the end of next year. In low energy supersymmetric extensions of the SM, the situation is similar for large values of the CP-odd Higgs mass $m_A$, but more interesting for lower values of $m_A$. The ($\sqrt{s}$ =7 TeV) LHC searches for a low-mass Standard Model Higgs boson predominantly in the $h\rightarrow \gamma\gamma,WW$ decay modes, which may be suppressed by an increase in the $h\rightarrow b\bar{b}, \tau^+ \tau^-$ partial widths (and thus the total $h$ width) for $m_A\lesssim 500$ GeV. Although $h\rightarrow b\bar{b}, \tau^+ \tau^-$ are sought at the LHC, these channels are not powerful enough to fully counter this suppression in the first year of running. We consider two alternative possibilities for probing the low $m_A$ region: nonstandard Higgs boson searches at the LHC, and a statistical combination with the Tevatron, where $Vh\rightarrow b\bar{b}$ is the primary search channel for light $h$. We also study an MSSM scenario in which the $h\rightarrow\gamma\gamma$ rate is enhanced at low $m_A$ to the point where discovery is possible in the near future.