Testing the HyperCP anomaly at LHCb: evidence for the ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ decay

Abstract

A search for ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ 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.

arXiv commentProceedings contribution prepared for the International Conference on Kaon Physics 2019

References in corpus (26)

• Secluded U(1) below the weak scale
• Search for a dark photon in e+e- collisions at BABAR
• Search for dark photons produced in 13 TeV $pp$ collisions
• Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Upsilon -> gamma A0
• Mass distributions marginalized over per-event errors
• Search for hidden-sector bosons in $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays
• Search for long-lived scalar particles in $B^{+}\to K^{+}\chi ({\mu }^{+}{\mu }^{-})$ decays
• Evidence for the Decay Sigma+ -> p mu+ mu-
• Search for Light CP-odd Higgs in Radiative Decays of Upsilon(1S)
• Search for NMSSM Higgs bosons in the h->aa->mumu mumu, mumu tautau channels using ppbar collisions at sqrt{s}=1.96 TeV
• Implications of a new particle from the HyperCP data on Σ^+ \to p μ^+ μ^-
• Search for a light exotic particle in J/psi radiative decays
• On sgoldstino interpretation of HyperCP events
• Evidence for the rare decay ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$
• On the Possibility of a New Boson X^0 (214 MeV) in Sigma^+ -> p mu^+ mu^-
• The Decay Sigma^+ -> p l^+ l^- within the Standard Model
• Radiative quarkonium decays and the NMSSM Higgs interpretation of the HyperCP Sigma+ --> p mu+mu- events
• Search for a Low Mass Particle Decaying into mu^+ mu^- in B0-> K*0 X and B0-> rho0 X at Belle
• U-boson and the HyperCP exotic events
• Search for rare $B_{(s)}^0\to {\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$ decays
• Search for a light pseudoscalar particle in the decay $K_L^0\to {\pi }^0{\pi }^{0}X$
• More about sgoldstino interpretation of HyperCP events
• Constraints on the new particle in ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$
• Searching for a particle of unknown mass and lifetime in the presence of an unknown non-monotonic background
• Contributions from SUSY-FCNC couplings to the interpretation of the HyperCP events for the decay Σ^+ \to p μ^+ μ^-
• Search for the Rare Decays KL->pi0pi0mu+mu- and KL->pi0pi0X0->pi0pi0mu+mu-