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

We constrain the light CP-odd Higgs A(1)(0) in NMSSM via the rare decay pi(0) -> e(+)e(-). It is shown that the possible 3 sigma discrepancy between theoretical predictions and the recent KTeV measurement of B(pi(0) -> e(+)e(-)) cannot be resolved when the constraints from gamma -> gamma A(1)(0), a(mu) and pi(0) -> gamma gamma are combined. Furthermore, the combined constraints also exclude the scenario involving m(A1)(0) = 214.3 MeV, which is invoked to explain the anomaly in the Sigma(+) -> p mu(+)mu(-) decay found by the HyperCP Collaboration. (C) 2009 Elsevier B.V. All rights reserved.