The very rare D{*}(2007)(0) -> mu(+) mu(-) decay is searched for by analysing B- -> pi (-) mu(+) mu(-) decays. The analysis uses a sample of beautymesons produced in protonproton 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 mu(+) mu(-) and pi(-) mu(+) mu(-) 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) -> mu(+) mu(-)) < 2.6 x 10(-8) at 90\% confidence level. This is the first limit on the branching fraction of D{*}(2007)(0) -> mu(+) mu(-) decays and the most stringent limit on 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.
Search for D{*} (2007)0 → μ+ μ- in B- → π- μ+ μ- decays
Cardinale, R.;Petrolini, A.;Sergi, A.;
2023-01-01
Abstract
The very rare D{*}(2007)(0) -> mu(+) mu(-) decay is searched for by analysing B- -> pi (-) mu(+) mu(-) decays. The analysis uses a sample of beautymesons produced in protonproton 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 mu(+) mu(-) and pi(-) mu(+) mu(-) 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) -> mu(+) mu(-)) < 2.6 x 10(-8) at 90\% confidence level. This is the first limit on the branching fraction of D{*}(2007)(0) -> mu(+) mu(-) decays and the most stringent limit on 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.
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