The very rare D∗(2007)0→μ+μ- decay is searched for by analysing B-→π-μ+μ- decays. The analysis uses a sample of beauty mesons produced in proton–proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 \,fb - 1 . The signal signature corresponds to simultaneous peaks in the μ+μ- and π-μ+μ- invariant masses. No evidence for an excess of events over background is observed and an upper limit is set on the branching fraction of the decay at B(D∗(2007)0→μ+μ-)<2.6×10-8 at 90 % confidence level. This is the first limit on the branching fraction of D∗(2007)0→μ+μ- decays and the most stringent limit on D∗(2007) decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.

Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Search for D∗(2007) → μ+μ- in B-→ π-μ+μ- decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(7) [10.1140/epjc/s10052-023-11759-6].

Search for D∗(2007) → μ+μ- in B-→ π-μ+μ- decays

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Gotti C.;Martinazzoli L.;Martinelli M.;Mauri A.;Meloni S.;Minotti A.;Petruzzo M.;Pizzichemi M.;Salomoni M.;Shields E. B.;
2023

Abstract

The very rare D∗(2007)0→μ+μ- decay is searched for by analysing B-→π-μ+μ- decays. The analysis uses a sample of beauty mesons produced in proton–proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 \,fb - 1 . The signal signature corresponds to simultaneous peaks in the μ+μ- and π-μ+μ- invariant masses. No evidence for an excess of events over background is observed and an upper limit is set on the branching fraction of the decay at B(D∗(2007)0→μ+μ-)<2.6×10-8 at 90 % confidence level. This is the first limit on the branching fraction of D∗(2007)0→μ+μ- decays and the most stringent limit on D∗(2007) decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.
Articolo in rivista - Articolo scientifico
Branching fractions; Charm+; Confidence levels; Final state; Integrated luminosity; Invariant mass; Meson decays; Proton proton collisions; Stringents; Upper limits
English
26-lug-2023
2023
83
7
666
open
Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Search for D∗(2007) → μ+μ- in B-→ π-μ+μ- decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(7) [10.1140/epjc/s10052-023-11759-6].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/466525
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