Evidence for the Decay Sigma+ -> p mu+ mu-
H.K. Park, R.A. Burnstein, A. Chakravorty, Y.C. Chen, W.S. Choong, K., Clark, E.C. Dukes, C. Durandet, J. Felix, Y. Fu, G. Gidal, H.R. Gustafson, T., Holmstrom, M. Huang, C. James, C. M. Jenkins, T. Jones, D.M. Kaplan, L.M., Lederman, N. Leros, M.J. Longo, F. Lopez, L.C. Lu
TL;DR
This paper presents the first evidence for the rare decay Sigma+ -> p mu+ mu- observed in Fermilab data, suggesting a possible intermediate neutral state with specific mass, and estimates its branching ratio.
Contribution
It reports the first experimental evidence for the decay Sigma+ -> p mu+ mu- and proposes a potential intermediate particle based on dimuon mass analysis.
Findings
Observation of three decay events supporting Sigma+ -> p mu+ mu-
Estimated branching ratio of approximately 8.6 x 10^-8
Indication of a neutral intermediate state with mass 214.3 MeV/c^2
Abstract
We report the first evidence for the decay Sigma+ -> p mu+ mu- from data taken by the HyperCP experiment(E871) at Fermilab. Based on three observed events, the branching ratio is B(Sigma+ -> p,mu+,mu-) = [8.6 +6.6,-5.4(stat) +/-5.5(syst)] x 10**-8. The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, Sigma+ -> p P0, P0 -> mu+ mu-, with a P0 mass of 214.3 +/- 0.5 MeV/c**2 and branching ratio B(Sigma+ -> p P0; P0 -> mu+ mu-) = [3.1 +2.4,-1.(stat) +/-1.5(syst)] x 10**-8.
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