Long-lived particles decaying to e±μ∓ν, with masses between 7 and 50GeV/c2 and lifetimes between 2 and 50ps, are searched for by looking at displaced vertices containing electrons and muons of opposite charges. The search is performed using 5.4fb-1 of pp collisions collected with the LHCb detector at a centre-of-mass energy of s=13TeV. Three mechanisms of production of long-lived particles are considered: the direct pair production from quark interactions, the pair production from the decay of a Standard-Model-like Higgs boson with a mass of 125GeV/c2, and the charged current production from an on-shell W boson with an additional lepton. No evidence of these long-lived states is obtained and upper limits on the production cross-section times branching fraction are set on the different production modes.
Aaij, R., Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Search for long-lived particles decaying to e± μ∓ ν. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(3) [10.1140/epjc/s10052-021-08994-0].
Search for long-lived particles decaying to e± μ∓ ν
Borsato M.;Calvi M.Membro del Collaboration Group
;Capelli S.;Carniti P.Membro del Collaboration Group
;Fazzini D.Membro del Collaboration Group
;Gotti C.Membro del Collaboration Group
;Martinazzoli L.Membro del Collaboration Group
;Martinelli M.Membro del Collaboration Group
;Meloni S.Membro del Collaboration Group
;Petruzzo M.Membro del Collaboration Group
;Shields E. B.Membro del Collaboration Group
;
2021
Abstract
Long-lived particles decaying to e±μ∓ν, with masses between 7 and 50GeV/c2 and lifetimes between 2 and 50ps, are searched for by looking at displaced vertices containing electrons and muons of opposite charges. The search is performed using 5.4fb-1 of pp collisions collected with the LHCb detector at a centre-of-mass energy of s=13TeV. Three mechanisms of production of long-lived particles are considered: the direct pair production from quark interactions, the pair production from the decay of a Standard-Model-like Higgs boson with a mass of 125GeV/c2, and the charged current production from an on-shell W boson with an additional lepton. No evidence of these long-lived states is obtained and upper limits on the production cross-section times branching fraction are set on the different production modes.
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