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). Search for D∗(2007)0 → μ+μ− in B− → π−μ+μ− decays [journal article - articolo]. In THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. Retrieved from https://hdl.handle.net/10446/284569
Search for D∗(2007)0 → μ+μ− in B− → π−μ+μ− decays
Lupato A.;Redi F.;
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.File | Dimensione del file | Formato | |
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