In:
The European Physical Journal C, Springer Science and Business Media LLC, Vol. 83, No. 7 ( 2023-07-26)
Abstract:
The very rare $${{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} $$ D ∗ ( 2007 ) 0 → μ + μ - decay is searched for by analysing $${{{B} ^-}} \!\rightarrow {{\pi } ^-} {\mu ^+\mu ^-} $$ 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 $$\text {\,fb} ^{-1}$$ \,fb - 1 . The signal signature corresponds to simultaneous peaks in the $${\mu ^+\mu ^-} $$ μ + μ - and $${{\pi } ^-} {\mu ^+\mu ^-} $$ 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 $$\mathcal{B}({{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} ) 〈 2.6\times 10^{-8}$$ B ( D ∗ ( 2007 ) 0 → μ + μ - ) 〈 2.6 × 10 - 8 at $$90\%$$ 90 % confidence level. This is the first limit on the branching fraction of $${{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} $$ D ∗ ( 2007 ) 0 → μ + μ - decays and the most stringent limit on $${{D} ^*} (2007)^0$$ D ∗ ( 2007 ) 0 decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.
Type of Medium:
Online Resource
ISSN:
1434-6052
DOI:
10.1140/epjc/s10052-023-11759-6
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2023
detail.hit.zdb_id:
1397769-6
detail.hit.zdb_id:
1459069-4
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