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E.Yeroshenko, V.Yeung, H.Yin, H.Yu, J.Yuan, X.Zaffaroni, E.Zavertyaev, M.Zdybal, M.Zenaiev, O.Zeng, M.Zhang, C.Zhang, D.Zhang, L.Zhang, S.Zhang, Y.Zharkova, A.Zhelezov, A.Zheng, Y.Zhou, T.Zhou, X.Zhou, Y.Zhovkovska, V.Zhu, X.Zhu, Z.Zhukov, V.Zou, Q.Zucchelli, S.Zuliani, D.Zunica, G.2023-09-252023-09-252023-09-252023-06-2310.1007/JHEP06(2023)143https://infoscience.epfl.ch/handle/20.500.14299/201024WOS:001035228800001A first search for the lepton-flavour violating decays B^0 -> K^(*0)τ^(±)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 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)τ^(+)µ^(-)) < 1.0 (1.2) x 10^(-5) and B(B^0 -> K^(*0)τ^(-)µ^(+)) < 8.2 (9.8) x 10^(-6) at the 90% (95%) confidence level.Physics, Particles & FieldsPhysicsb physicsbeyond standard modelhadron-hadron scatteringrare decayphysicstext::journal::journal article::research article