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arXiv · hep-ex/0501014

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·W. Luebke·K. B. Luk·K. S. Nelson·J. -P. Perroud·D. Rajaram·H. A. Rubin·J. Volk·C. G. White·S. L. White·P. Zyla
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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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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, W. Luebke, K. B. Luk, K. S. Nelson, J. -P. Perroud, D. Rajaram, H. A. Rubin, J. Volk, C. G. White, S. L. White, P. Zyla. 2005-01-24. Evidence for the Decay Sigma+ -> p mu+ mu-. https://doi.org/10.1103/physrevlett.94.021801

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