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

The LHCb Collaboration

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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.

Original languageEnglish
Article number666
Number of pages14
JournalEuropean Physical Journal C
Issue number7
Publication statusPublished - Jul 2023

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