Evidence for the Decay Sigma+ -> p mu+ mu-

2005/01/07 by H.K. Park, H. K. Park, R. A. Burnstein +40 · 1 voice · 7 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.94.021801

published as Phys.Rev.Lett.94:021801,2005 · As published in PRL

openalex publication_date 2005/01/18 · arxiv created 2005/01/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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/c**2 and branching ratio B(Sigma+ -> p P0; P0 -> mu+ mu-) = [3.1 +2.4,-1.(stat) +/-1.5(syst)] x 10**-8.

Cited by

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• DecayΣ+→pℓ+ℓ−within the standard model
• Search for Dimuon Decays of a Light Scalar Boson in Radiative TransitionsΥ→γA0
• A NEW EXPERIMENT TO STUDY HYPERON CP VIOLATION AND THE CHARMONIUM SYSTEM
• Search for RareB(s)0→μ+μ−μ+μ−Decays

Discussions

• 20 years ago the HyperCP experiment at @fermilab.bsky.social announced evidence for a very rare decay of the strange Σ baryon, Σ⁺→pμ⁺μ⁻. They had 3 events with effectively no background. arxiv.org/abs [bsky, 9 points, 2 comments]

Related

• Hints of New Physics in the Decay Sigma-plus -> proton + mu-plus + mu-minus
• Sigma to p mu+ mu-: Standard Model or New Particle?
• K+ -> pi+ mu+ mu- in E865 at BNL
• The B_s --> mu+mu- and B_d --> mu+mu- Decays: Standard Model and Beyond
• Observation of the very rare Σ⁺ → p μ⁺ μ^- decay