Evidence for the Decay Σ + → p μ + μ −

Y C Chen,Mingshyan Huang,T W Jones,D M Kaplan,N Leros,Michael J Longo,Francisco J Lopez,L C Lu,W Luebke,K B Luk,K S Nelson,J P Perroud,D Rajaram,C M Jenkins,C James,A Chakravorty,H A Rubin, J T Volk, Christopher G White,S L White,L M Lederman, P Zyla,R A Burnstein,T Holmstrom, H R Gustafson, G Gidal,Yao Fu, H K Park,J Felix, C Durandet,E C Dukes,K Clark,W S Choong

Physical Review Letters（2005）

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摘要

We report the first evidence for the decay ∑+ → pμ+ μ- from data taken by the HyperCP (E871) experiment at Fermilab. Based on three observed events, the branching ratio is B(∑+ → pμ+ μ-) = [8.6 -5.4 +6.6(stat) ± 5.5(syst)] × 10 -8. The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, ∑+ rarr; pp0, p0 → μ+ μ- with a P0 mass of 214.3 ± 0.5 MeV/c 2 and branching ratio B(∑+ rarr; pp 0, p0 → μ+ μ-) = [3.1-1.9 -2.4(stat) ± 1.5(syst)] × 10 -8. © 2005 The American Physical Society.

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