The $\tau$-polarisation test for the $H/A\to\tau^+\tau^-$ signal at the   LHC
  The correlation between the two $\tau$-polarisations is predicted to be opposite $(+-/-+)$ for the $H/A \to \tau^+\tau^-$ 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 $\tau^+\tau^-$ decay channels at the LHC. 
S. Moretti (CERN & Ippp), D.P. Roy (TIFR & Ucr)