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Search for the decay D0 to \pi+ \pi- \mu+ \mu-

Abstract : A search for the D0 to \pi+ \pi- \mu+ \mu- decay, where the muon pair does not originate from a resonance, is performed using proton-proton collision data corresponding to an integrated luminosity of 1.0 fb-1 recorded by the LHCb experiment at a centre-of-mass energy of 7 TeV. No signal is observed and an upper limit on the relative branching fraction with respect to the resonant decay mode D0 to \pi+ \pi- \phi(to \mu+ \mu-), under the assumption of a phase-space model, is found to be B(D0 to \pi+ \pi- mu+ mu-)/B(D0 to \pi+ \pi- \phi(to \mu+ \mu-)) < 0.96 at the 90% confidence level. The upper limit on the absolute branching fraction is evaluated to be B(D0 to \pi+ \pi- \mu+ \mu-) < 5.5 x 10-7 at 90% confidence level. This is the most stringent to date.
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Submitted on : Thursday, October 10, 2013 - 11:20:42 AM
Last modification on : Sunday, June 26, 2022 - 11:59:51 AM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Search for the decay D0 to \pi+ \pi- \mu+ \mu-. Physics Letters B, Elsevier, 2014, 728, pp.234-243. ⟨10.1016/j.physletb.2013.11.053⟩. ⟨in2p3-00871699⟩



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