Search for heavy neutral leptons in W^+rightarrow mu ^{+}mu ^{pm }, text {jet} decays

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doi:10.1140/epjc/s10052-021-08973-5

Abstract

A search is performed for heavy neutrinos in the decay of a W boson into two muons and a jet. The data set corresponds to an integrated luminosity of approximately 3.0, text {fb} ^{-1} of proton–proton collision data at centre-of-mass energies of 7 and 8, text {TeV} collected with the LHCb experiment. Both same-sign and opposite-sign muons in the final state are considered. Data are found to be consistent with the expected background. Upper limits on the coupling of a heavy neutrino with the Standard Model neutrino are set at 95% confidence level in the heavy-neutrino mass range from 5 to 50, text {GeV/}c^2 . These are of the order of 10^{-3} for lepton-number-conserving decays and of the order of 10^{-4} for lepton-number-violating heavy-neutrino decays.

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