A search for the rare decay Σ^+→pμ^+μ^- is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies sqrt[s]=7 and 8 TeV, corresponding to an integrated luminosity of 3  fb^-1. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ^+→pμ^+μ^- branching fraction is (2.2_-1.3^+1.8)×10^-8, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.

Evidence for the Rare Decay Σ^+→pμ^+μ^-

Veltri, M;
2018-01-01

Abstract

A search for the rare decay Σ^+→pμ^+μ^- is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies sqrt[s]=7 and 8 TeV, corresponding to an integrated luminosity of 3  fb^-1. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ^+→pμ^+μ^- branching fraction is (2.2_-1.3^+1.8)×10^-8, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2666817
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