We search for a CP-odd light Higgs among 102 M $\Upsilon(1S)$ events recorded with the Belle detector at KEKB. Our signal mode is $\Upsilon(1S)\to\gamma A_0;A_0\to \tau^+\tau^-$, where the $\tau$ is detected via its leptonic decay modes. We determine the upper limits on the production rates for a CP-odd light Higgs with a mass between the $\tau^+\tau^-$ threshold and 9.4 GeV/$c^2$. This result puts stringent constraints on theoretical models of low mass NMSSM Higgs bosons.
Dr Karim Trabelsi (KEK)