A search for the very rare D 0 → μ + μ − decay is performed using data collected by the LHCb experiment in proton-proton collisions at √ s = 7 , 8, and 13 TeV, corresponding to an integrated luminosity of 9     fb − 1 . The search is optimized for D 0 mesons from D * + → D 0 π + decays but is also sensitive to D 0 mesons from other sources. No evidence for an excess of events over the expected background is observed. An upper limit on the branching fraction of this decay is set at B ( D 0 → μ + μ − ) < 3.1 × 10 − 9 at a 90% C.L. This represents the world’s most stringent limit, constraining models of physics beyond the standard model.

Search for Rare Decays of D0 Mesons into Two Muons

Audurier, B.;Belin, S.;Brundu, D.;Bursche, A.;Cardini, A.;Chen, S.;Dettori, F.;Dordei, F.;Fabiano, F.;Lampis, A.;Litvinov, R.;Manca, G.;Muzzetto, P.;Oldeman, R.;Saitta, B.;Sun, J.;
2023-01-01

Abstract

A search for the very rare D 0 → μ + μ − decay is performed using data collected by the LHCb experiment in proton-proton collisions at √ s = 7 , 8, and 13 TeV, corresponding to an integrated luminosity of 9     fb − 1 . The search is optimized for D 0 mesons from D * + → D 0 π + decays but is also sensitive to D 0 mesons from other sources. No evidence for an excess of events over the expected background is observed. An upper limit on the branching fraction of this decay is set at B ( D 0 → μ + μ − ) < 3.1 × 10 − 9 at a 90% C.L. This represents the world’s most stringent limit, constraining models of physics beyond the standard model.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/371243
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