2026-04-17T03:48:49Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2206222025-11-21T05:26:13Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Aaij, R. author Alfonso Albero, Alejandro author Garcia Moreno, Paula author Garrido Beltrán, Lluís author Gironella Gironell, Pere author Gomez Fernandez, S. author Graugés Pous, Eugeni author Lobo Salvia, Aniol author Marin Benito, Carla author Mauricio, J. author Vazquez Gomez, Ricardo author LHCb Collaboration author 2025-04-25T12:33:10Z 2025-04-25T12:33:10Z 2023 2025-04-25T12:33:10Z A search for the lepton-flavour violating decays B0 → K∗0µ ±e ∓ and B0 s → 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∗0µ +e −) < 5.7 × 10−9 (6.9 × 10−9 ), B(B 0→ K∗0µ −e +) < 6.8 × 10−9 (7.9 × 10−9 ), B(B 0→ K∗0µ ±e ∓) < 10.1 × 10−9 (11.7 × 10−9 ), B(B 0 s → φµ±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 B0 s → φµ±e ∓ the first being set. In addition, limits are reported for scalar and left-handed lepton-flavour violating New Physics scenarios.  Física de partícules Hadrons Particle physics Hadrons Search for the lepton-flavour violating decays B 0 → K *0 μ ± e ∓ and Bs0 → ϕμ ± e ∓