The first search for the lepton-flavor violating decays B+ → π+ μ± e∓ in proton-proton collisions is presented, using data collected by the LHCb experiment between 2011 and 2018, corresponding to an integrated luminosity of 9 fb-1. No significant signal is observed and an upper limit on the branching fraction is set at B(B+ → π+ μ± e∓) < 1.8 × 10-9 at the 90% confidence level, 2 orders of magnitude more restrictive than the most stringent upper limit to date. This is the first constraint on lepton-flavor violating b → d quark transitions at the LHC and also sets the most stringent upper limits to date on b → d μ± e∓ transitions. Limits on left-handed and scalar scenarios beyond the standard model are also reported.

(2026). Search for the Lepton-Flavor Violating Decays B+ → π+ μ± e∓ [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from https://hdl.handle.net/10446/335248

Search for the Lepton-Flavor Violating Decays B+ → π+ μ± e∓

Lupato, A.;Redi, F.;
2026-01-01

Abstract

The first search for the lepton-flavor violating decays B+ → π+ μ± e∓ in proton-proton collisions is presented, using data collected by the LHCb experiment between 2011 and 2018, corresponding to an integrated luminosity of 9 fb-1. No significant signal is observed and an upper limit on the branching fraction is set at B(B+ → π+ μ± e∓) < 1.8 × 10-9 at the 90% confidence level, 2 orders of magnitude more restrictive than the most stringent upper limit to date. This is the first constraint on lepton-flavor violating b → d quark transitions at the LHC and also sets the most stringent upper limits to date on b → d μ± e∓ transitions. Limits on left-handed and scalar scenarios beyond the standard model are also reported.
articolo
2026
Aaij, R.; Abdelfatah, M.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adla...espandi
(2026). Search for the Lepton-Flavor Violating Decays B+ → π+ μ± e∓ [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from https://hdl.handle.net/10446/335248
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/335248
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