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  • Search for the lepton-flavour violating decays B0→ K0μ±e∓ and Bs0→ ϕμ±e
    Alfonso Albero, A.; Anderlini, L.; Bachmayer, M.; Barbetti, M.; Barlow, R. J.; Bediaga, I. B.; Bertella, C.; Bian, L.; Bieker, M. S.; Blusk, S.; Bondar, N.; Borsuk, J. T.; Burr, C.; Byczynski, W.; Calvo Gomez, M.; Cavallero, G.; Chobanova, V.; Cholak, S.; Chulikov, V.; Cicala, M. F.; Congedo, L.; Currie, R.; Davies, J. E.; De Aguiar Francisco, O.; De Lucia, E.; de Vries, J. A.; Douglas, L.; Downes, A. G.; Dufour, L.; Durham, J. M.; Eisenhardt, S.; Fiutowski, T.; Friday, D. A.; Fu, J.; Gandelman, M.; García Pardiñas, J.; Golobardes, E.; Graverini, E.; Guarise, M.; Gushchin, E.; Gys, T.; Haen, C.; Hao, L.; Heinicke, K.; Henry, L.; Hu, J.; Hu, W.; Hulsbergen, W.; Ibis, P.; Ilten, P.; Jage, H.; Jans, E.; Jiang, X.; Karpenkov, D.; Keizer, F.; Kopciewicz, P.; Krupa, W.; Lazzari, F.; Lukashenko, V.; Mackowiak, P.; Mariani, S.; Marshall, A. M.; Mcconnell, L.; McGrath, T. H.; McNab, A.; Meloni, S.; Naik, P.; Normand, C.; O’Hanlon, D. P.; Panshin, G.; Polyakov, I.; Saranin, D.; Scantlebury Smead, L. G.; Schulte, S.; Shangase, D. M.; Solovyev, I.; Souza De Almeida, F. L.; Spiridenkov, E.; Sun, J.; Szumlak, T.; Szymanski, M.; Teubert, F.; Tobin, M.; Trippl, C.; Tuci, G.; Uwer, U.; Vagnoni, V.; van Beuzekom, M.; Van Dijk, M.; Veltri, M.; Vorobyev, V.; Vos, K.; Wang, Z.; Westhenry, B. D. C.; Xu, J.; Yang, D.; Yang, Z.; Yeomans, L. E.; Yin, H.; Yu, J.

    The journal of high energy physics, 06/2023, Letnik: 2023, Številka: 6
    Journal Article

    A bstract A search for the lepton-flavour violating decays B 0 → K *0 μ ± e ∓ and B s 0 → ϕμ ± e ∓ is presented, using proton-proton collision data collected by the LHCb detector at the LHC, corresponding to an integrated luminosity of 9 fb − 1 . No significant signals are observed and upper limits of B B 0 → K ∗ 0 μ + e − < 5.7 × 10 − 9 6.9 × 10 − 9 , B B 0 → K ∗ 0 μ − e + < 6.8 × 10 − 9 7.9 × 10 − 9 , B B 0 → K ∗ 0 μ ± e ∓ < 10.1 × 10 − 9 11.7 × 10 − 9 , B B s 0 → ϕ μ ± e ∓ < 16.0 × 10 − 9 19.8 × 10 − 9 are set at 90% (95%) confidence level. These results constitute the world’s most stringent limits to date, with the limit on the decay B s 0 → ϕμ ± e ∓ the first being set. In addition, limits are reported for scalar and left-handed lepton-flavour violating New Physics scenarios.

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