Abstract
A first search for the lepton-flavour violating decays B0 → K*0τ±μ∓ 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 13 TeV 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 mathcal{B}left({B}^0to {K}^{ast 0}{tau}^{+}{mu}^{-}right)<1.0(1.2)times {10}^{-5} and mathcal{B}left({B}^0to {K}^{ast 0}{tau}^{-}{mu}^{+}right)<8.2(9.8)times {10}^{-6} at the 90% (95%) confidence level.
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