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.

Search for D*(2007)⁰ → μ⁺μ⁻ in B⁻→ π⁻μ⁺μ⁻ decays

Graverini E.;Punzi G.;
2023-01-01

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.
2023
Aaij, R.; Abdelmotteleb, A. S. W.; Beteta, C. A.; Abudinen, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou, C.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1221752
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