The $τ$-polarisation test for the $H/A\toτ^+τ^-$ signal at the LHC

Abstract

The correlation between the two $τ$-polarisations is predicted to be opposite $(+-/-+)$ for the $H/A \to τ^+τ^-$ signal, while it corresponds to the same sign combinations for the Drell-Yan $(++/--)$ and $t \bar t$ $(--)$ backgrounds. We show that this correlation can serve as a distinctive test to confirm the presence of the MSSM Higgs bosons $H$ and $A$ in their hadronic $τ^+τ^-$ decay channels at the LHC.