Search for a CP-odd light Higgs boson in J/ψ → γA0

Using J/psi radiative decays from 9.0 billion J/psi events collected by the BESIII detector, we search for di-muon decays of a CP-odd light Higgs boson (A(0)), predicted by many new physics models beyond the Standard Model, including the next-to-minimal supersymmetric Standard Model. No evidence for the CP-odd light Higgs production is found, and we set 90% confidence level upper limits on the product branching fraction B(J/psi -> gamma A(0)) x B(A(0) -> mu(+)mu(-)) in the range of (1.2 - 778.0) x 10(-9) for 0.212 <= m(A0) <= 3.0 GeV/c(2). The new measurement is a 6-7 times improvement over our previous measurement, and is also slightly better than the BABAR measurement in the low-mass region for tan beta = 1.

Automated summary

In this study, J/psi radiative decays were analyzed to search for di-muon decays of a CP-odd light Higgs boson. No evidence of such decays was found, and upper limits on the product branching fraction were set.