Search for the lepton-flavour violating decays B-0 -> K*0 tau(+/-)mu -/+

A first search for the lepton-flavour violating decays B-0 -> K*0 tau(+/-)mu -/+ is presented. The analysis is performed using a sample of proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13TeV between 2011 and 2018, corresponding to an integrated luminosity of 9 fb(-1). No significant signal is observed, and upper limits on the branching fractions are determined to be B(B-0 -> K*0 tau(+)mu(-)) < 1.0 (1.2) x 10(-5) and B(B-0 -> K*0 tau(-)mu(+)) < 8.2 (9.8) x 10(-6) at the 90% (95%) confidence level.

Automated summary

A search for lepton-flavour violating decays B-0 -> K*0 tau(+/-)mu(-/+) is conducted using data from proton-proton collisions collected by the LHCb detector at energies of 7, 8, and 13TeV between 2011 and 2018. No significant signal is observed, and upper limits on the branching fractions are determined at the 90% (95%) confidence level to be B(B-0 -> K*0 tau(+)mu(-)) < 1.0 (1.2) x 10(-5) and B(B-0 -> K*0 tau(-)mu(+)) < 8.2 (9.8) x 10(-6).