Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-11-09
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 3 figures, submitted to Physical Review Letters
Scientific paper
Using a data sample containing 1.06x10^8 psi' events collected with the BESIII detector at the BEPCII electron-positron collider, we search for a light Higgs-like boson A^0 in the process psi' -> pi^+ pi^- J/psi, J/psi -> gamma A^0, A^0 -> mu^+ mu^-. Particles of this type are predicted in the next-Minimal supersymmetric extension of the Standard Model. The HyperCP experiment observed three anomalous Sigma^+ -> p mu^+ mu^- events, with mu+ mu- masses clustered around 214.3 +- 0.5 MeV/c^2. In this analysis, we find no evidence for any mu^+ mu^- mass peak between the mass threshold and 3.0 GeV/c^2. We set 90% confidence level upper limits on the product branching fractions for J/psi -> gamma A^0, A^0 -> mu^+ mu^- that range from 4x10^{-7}$ to 2.1x10^{-5}, depending on the mass of A^0, for M(A^0)< 3.0 GeV/c^2. Only one event is seen in the mass region below 255 MeV/c^2 and this has a mu^+ mu^- mass of 213.3 MeV/c^2 and the product branching fraction upper limit 5x10^{-7}.
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