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

  • Author(s): Aaij, R
  • Abellán Beteta, C
  • Adeva, B
  • Adinolfi, M
  • Affolder, A
  • Ajaltouni, Z
  • Akar, S
  • Albrecht, J
  • Alessio, F
  • Alexander, M
  • Ali, S
  • Alkhazov, G
  • Alvarez Cartelle, P
  • Alves, AA
  • Amato, S
  • Amerio, S
  • Amhis, Y
  • An, L
  • Anderlini, L
  • Anderson, J
  • Andreassi, G
  • Andreotti, M
  • Andrews, JE
  • Appleby, RB
  • Aquines Gutierrez, O
  • Archilli, F
  • d'Argent, P
  • Artamonov, A
  • Artuso, M
  • Aslanides, E
  • Auriemma, G
  • Baalouch, M
  • Bachmann, S
  • Back, JJ
  • Badalov, A
  • Baesso, C
  • Baldini, W
  • Barlow, RJ
  • Barschel, C
  • Barsuk, S
  • Barter, W
  • Batozskaya, V
  • Battista, V
  • Bay, A
  • Beaucourt, L
  • Beddow, J
  • Bedeschi, F
  • Bediaga, I
  • Bel, LJ
  • Bellee, V
  • Belloli, N
  • Belyaev, I
  • Ben-Haim, E
  • Bencivenni, G
  • Benson, S
  • Benton, J
  • Berezhnoy, A
  • Bernet, R
  • Bertolin, A
  • Bettler, MO
  • van Beuzekom, M
  • Bifani, S
  • Billoir, P
  • Bird, T
  • Birnkraut, A
  • Bizzeti, A
  • Blake, T
  • Blanc, F
  • Blouw, J
  • Blusk, S
  • Bocci, V
  • Bondar, A
  • Bondar, N
  • Bonivento, W
  • Borghi, S
  • Borisyak, M
  • Borsato, M
  • Bowcock, TJV
  • Bowen, E
  • Bozzi, C
  • Braun, S
  • Britsch, M
  • Britton, T
  • Brodzicka, J
  • Brook, NH
  • Buchanan, E
  • Burr, C
  • Bursche, A
  • Buytaert, J
  • Cadeddu, S
  • Calabrese, R
  • et al.
Abstract

© 2016 CERN for the benefit of the LHCb Collaboration. 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-1of proton-proton collisions at centre-of-mass energies of 7TeV and 8TeV, collected by the LHCb experiment. Candidate D0mesons 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 normalization channel. No significant excess of D0→e±μ∓candidates over the expected background is seen, and a limit is set on the branching fraction, B(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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