Search for BSM Higgs bosons in the mumu decay channel with the ATLAS experiment

Two searches for BSM Higgs bosons decaying in two muons are presented. Neutral MSSM Higgs searches $h/A/h\rightarrow\mu\mu$ have been performed using 4.8 $fb^{-1}$ of 2011 data collected with the ATLAS detector at the LHC. Searches for the NMSSM decay $a_{1}\rightarrow\mu\mu$ have been performed on 39 $pb^{-1}$ of 2010 data. No excess of events compared to the Standard Model expectations is observed in both searches. Exclusion limits have been evaluated at the 95% confidence level.