Evidence for the decay sigma+ --> pmu+ mu- |
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| Authors: | Park H K,Burnstein R A,Chakravorty A,Chen Y C,Choong W S,Clark K,Dukes E C,Durandet C,Felix J,Fu Y,Gidal G,Gustafson H R,Holmstrom T,Huang M,James C,Jenkins C M,Jones T,Kaplan D M,Lederman L M,Leros N,Longo M J,Lopez F,Lu L C,Luebke W,Luk K B,Nelson K S,Perroud J-P,Rajaram D,Rubin H A,Volk J,White C G,White S L,Zyla P HyperCP Collaboration |
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| Affiliation: | University of Michigan, Ann Arbor, Michigan 48109, USA. |
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| Abstract: | We report the first evidence for the decay Sigma(+)-->pmu(+)mu(-) from data taken by the HyperCP (E871) experiment at Fermilab. Based on three observed events, the branching ratio is B(Sigma(+)-->pmu(+)mu(-))=[8.6(+6.6)(-5.4)(stat)+/-5.5(syst)]x10(-8). The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, Sigma(+)-->pP(0),P0-->mu(+)mu(-) with a P0 mass of 214.3+/-0.5 MeV/c(2) and branching ratio B(Sigma(+)-->pP(0),P0-->mu(+)mu(-))=[3.1(+2.4)(-1.9)(stat)+/-1.5(syst)]x10(-8). |
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