Rare decay π0→e+e− constraints on the light CP-odd Higgs in NMSSM

We constrain the light CP-odd Higgs A10 in NMSSM via the rare decay π0→e+e−. It is shown that the possible 3σ discrepancy between theoretical predictions and the recent KTeV measurement of B(π0→e+e−) cannot be resolved when the constraints from ϒ→γA10, aμ and π0→γγ are combined. Furthermore, the combined constraints also exclude the scenario involving mA10=214.3 MeV, which is invoked to explain the anomaly in the Σ+→pμ+μ− decay found by the HyperCP Collaboration.