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 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 mu+mu- and pi-mu+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 BR(D*(2007)0->mu+mu-)<2.6x10-8 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) 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 -> mu+mu- in B--> pi-mu+mu- decays

Bassi G.
Membro del Collaboration Group
;
Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Ribatti R.
Membro del Collaboration Group
;
2023

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 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 mu+mu- and pi-mu+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 BR(D*(2007)0->mu+mu-)<2.6x10-8 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) decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.
2023
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
  
     https://doi.org/10.1140/epjc/s10052-023-11759-6
     https://dx.doi.org/10.1140/epjc/s10052-023-11759-6
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/156563
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