Search for the lepton-flavour violating decay D0→e±μ∓

Abstract : A search for the lepton-flavour violating decay D0→e±μ∓ is made with a dataset corresponding to an integrated luminosity of 3.0 fb−1 of proton-proton collisions at centre-of-mass energies of 7 TeV and 8 TeV, collected by the LHCb experiment. Candidate D0 mesons are selected using the decay D∗+→D0π+ and the D0→e±μ∓ branching fraction is measured using the decay mode D0→K−π+ as a normalisation channel. No significant excess of D0→e±μ∓ candidates over the expected background is seen, and a limit is set on the branching fraction, (D0→e±μ∓)<1.3×10−8, at 90 % confidence level. This is an order of magnitude lower than the previous limit and it further constrains the parameter space in some leptoquark models and in supersymmetric models with R-parity violation.
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http://hal.in2p3.fr/in2p3-01236676
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Submitted on : Wednesday, December 2, 2015 - 9:52:55 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Search for the lepton-flavour violating decay D0→e±μ∓. Physics Letters B, Elsevier, 2016, 754, pp. 167-175. ⟨10.1016/j.physletb.2016.01.029⟩. ⟨in2p3-01236676⟩

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