Testing the HyperCP anomaly at LHCb: evidence for the $Σ^+ \to p μ^+ μ^-$ decay

preprint2019arXivOpen access

A search for $Σ^+ \to p μ^+ μ^-$ decays with LHCb Run 1 data is presented, yielding an evidence for this decay and a measurement of a branching fraction compatible with the Standard Model. The HyperCP anomaly in the dimuon invariant mass distribution is not confirmed, and its branching fraction central value is excluded at 95\% CL. Prospects for the future of this measurement in LHCb are also presented.

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Testing the HyperCP anomaly at LHCb: evidence for the $Σ^+ \to p μ^+ μ^-$ decay

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Testing the HyperCP anomaly at LHCb: evidence for the Σ+→pμ+μ−Σ^+ \to p μ^+ μ^-Σ+→pμ+μ− decay

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Testing the HyperCP anomaly at LHCb: evidence for the $Σ^+ \to p μ^+ μ^-$ decay