Search for the decay D0 to π+ π- μ+ μ-
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
name: Ajaltouni, Z.
name: Albrecht, J.
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name: Cartelle, P. Alvarez
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name: Appleby, R. B.
name: Gutierrez, O. Aquines
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name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Baalouch, M.
name: Bachmann, S.
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name: Bencivenni, G.
name: Benson, S.
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name: Berezhnoy, A.
name: Bernet, R.
name: Bettler, M. -O.
name: van Beuzekom, M.
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name: Bird, T.
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name: Bjørnstad, P. M.
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name: Bocci, V.
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name: Borghi, S.
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name: Bozzi, C.
name: Brambach, T.
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name: Calvi, M.
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name: Perez, D. Campora
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name: Carranza-Mejia, H.
name: Carson, L.
name: Akiba, K. Carvalho
name: Casse, G.
name: Garcia, L. Castillo
name: Cattaneo, M.
name: Cauet, Ch.
name: Cenci, R.
name: Charles, M.
name: Charpentier, Ph.
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Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A search for the D0 to π+ π- μ+ μ- 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 π+ π- ϕ(to μ+ μ-), under the assumption of a phase-space model, is found to be B(D0 to π+ π- mu+ mu-)/B(D0 to π+ π- ϕ(to μ+ μ-)) &lt; 0.96 at the 90% confidence level. The upper limit on the absolute branching fraction is evaluated to be B(D0 to π+ π- μ+ μ-) &lt; 5.5 x 10-7 at 90% confidence level. This is the most stringent to date.