Evidence for the decay Sigma+ ---> p mu+ mu-
We report the first evidence for the decay {Sigma}{sup +} {yields} p{mu}{sup +}{mu}{sup -} from data taken by the HyperCP (E871) experiment at Fermilab. Based on three observed events, the branching ratio is {Beta}({Sigma}{sup +} {yields} p{mu}{sup +}{mu}{sup -}) = [8.6{sub -5.4}{sup +6.6}(stat) {+-} 5.5(syst)] x 10{sup -8}. The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, {Sigma}{sup +} {yields} pP{sup 0},P{sup 0} {yields} {mu}{sup +}{mu}{sup -} with a P{sup 0} mass of 214.3 {+-} 0.5 MeV/c{sup 2} and branching ratio {Beta}({Sigma}{sup +} {yields} pP{sup 0}, P{sup 0} {yields} {mu}{sup +}{mu}{sup -}) = [3.1{sub -1.9}{sup +2.4}(stat) {+-} 1.5(syst)] x 10{sup -8}.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 15017313
- Report Number(s):
- FERMILAB-PUB-05-006-E; PRLTAO; arXiv eprint number hep-ex/0501014; TRN: US200606%%494
- Journal Information:
- Physical Review Letters, Vol. 94; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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