A first search for the lepton-flavour-violating decays B0 → K*0 τ± e∓ is presented. The analysis is performed using a sample of proton-proton collision data, collected with the LHCb detector at a centre-of-mass energy of 13 TeV between 2016 and 2018, corresponding to an integrated luminosity of 5.4 fb^−1. No significant signal is observed, and upper limits on the branching fractions are determined to be BR(B0 → K*0 τ− e+) < 5.9(7.1) × 10^−6 and BR(B0 → K*0 τ+ e−) < 4.9(5.9) × 10^−6 at the 90% (95%) confidence level. These results correspond to the current most stringent upper limits for b → s τ l transitions.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Search for the lepton-flavour-violating decays B0 → K*0 τ± e∓. JOURNAL OF HIGH ENERGY PHYSICS, 2025(11), 0-33 [10.1007/jhep11(2025)172].

Search for the lepton-flavour-violating decays B0 → K*0 τ± e∓

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Zenesini, F.;
2025

Abstract

A first search for the lepton-flavour-violating decays B0 → K*0 τ± e∓ is presented. The analysis is performed using a sample of proton-proton collision data, collected with the LHCb detector at a centre-of-mass energy of 13 TeV between 2016 and 2018, corresponding to an integrated luminosity of 5.4 fb^−1. No significant signal is observed, and upper limits on the branching fractions are determined to be BR(B0 → K*0 τ− e+) < 5.9(7.1) × 10^−6 and BR(B0 → K*0 τ+ e−) < 4.9(5.9) × 10^−6 at the 90% (95%) confidence level. These results correspond to the current most stringent upper limits for b → s τ l transitions.
2025
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Search for the lepton-flavour-violating decays B0 → K*0 τ± e∓. JOURNAL OF HIGH ENERGY PHYSICS, 2025(11), 0-33 [10.1007/jhep11(2025)172].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1036684
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