Document Type

Article

Publication Date

1-18-2005

Abstract

We report the first evidence for the decay Σ+→pμ+μ- from data taken by the HyperCP (E871) experiment at Fermilab. Based on three observed events, the branching ratio is B(Σ+→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, Σ+→pP0,P0→μ+μ- with a P0 mass of 214.3±0.5  MeV/c2 and branching ratio B(Σ+→pP0,P0→μ+μ-)=[3.1-1.9+2.4(stat)±1.5(syst)]×10-8.

DOI

10.1103/PhysRevLett.94.021801

Version

Publisher's PDF

Comments

© 2005 The American Physical Society. The original publication is available at http://link.aps.org/doi/10.1103/PhysRevLett.94.021801.

Original Citation

Phys. Rev. Lett. 94, 021801 (2005)

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Physics Commons

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