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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 ;
Date:	7 Dec 2004
Journal:	Phys.Rev.Lett. 94 (2005) 021801
Subject:	hep-ex
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/c2 and branching ratio B(Sigma+ -> p P0; P0 -> mu+ mu-) = [3.1 +2.4,-1.(stat) +/-1.5(syst)] x 10**-8.
Source:	arXiv, hep-ex/0501014
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