title: Lepton flavour violating top decays at the LHC.
abstract: We consider lepton-flavour violating decays of the top quark, mediated by 4-fermion operators. We compile constraints on a complete set of SU(3) [Formula: see text] U(1)-invariant operators, arising from their loop contributions to rare decays and from HERA's single-top search. The bounds one-[Formula: see text] flavour change are more restrictive than on [Formula: see text]-[Formula: see text]; nonetheless the top could decay to a jet [Formula: see text] with a branching ratio of order [Formula: see text]. We estimate that the currently available LHC data (20 fb[Formula: see text] at 8 TeV) could be sensitive to [Formula: see text]+ jet) [Formula: see text], and we extrapolate that 100 fb[Formula: see text] at 13 TeV could reach a sensitivity of [Formula: see text].
authors.affiliation: IPNL, CNRS/IN2P3, 4 rue E. Fermi, 69622 Villeurbanne Cedex, France ; Université Lyon 1, Villeurbanne, France ; Université de Lyon, 69622 Lyon, France.
authors.forename: Sacha
authors.initials: S
authors.lastname: Davidson
authors.affiliation: CERN PH-TH, 1211 Geneva 23, Switzerland.
authors.forename: Michelangelo L
authors.initials: ML
authors.lastname: Mangano
authors.affiliation: IPNL, CNRS/IN2P3, 4 rue E. Fermi, 69622 Villeurbanne Cedex, France ; Université Lyon 1, Villeurbanne, France ; Université de Lyon, 69622 Lyon, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Perries
authors.affiliation: IPNL, CNRS/IN2P3, 4 rue E. Fermi, 69622 Villeurbanne Cedex, France ; Université Lyon 1, Villeurbanne, France ; Université de Lyon, 69622 Lyon, France.
authors.forename: Viola
authors.initials: V
authors.lastname: Sordini