The first evidence for the decay B+→π+e+e- is reported using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. A signal excess with a significance of 3.2σ is observed and the branching fraction is measured to be B(B+→π+e+e-)=(2.4-0.8+0.9 -0.2+0.4)×10-8, where the first set of uncertainties is statistical and the second is systematic. The result is consistent with the Standard Model expectation.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2026). First Evidence of the Decay B+ →π+e+e. PHYSICAL REVIEW LETTERS, 137(7) [10.1103/97c9-jl1m].

First Evidence of the Decay B+ →π+e+e

Anelli A.;Arnone L.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Moro A.;Pizzichemi M.;Salomoni M.;
2026

Abstract

The first evidence for the decay B+→π+e+e- is reported using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. A signal excess with a significance of 3.2σ is observed and the branching fraction is measured to be B(B+→π+e+e-)=(2.4-0.8+0.9 -0.2+0.4)×10-8, where the first set of uncertainties is statistical and the second is systematic. The result is consistent with the Standard Model expectation.
Articolo in rivista - Articolo scientifico
Branching fractions; Center-of-mass energies; Centre-of-mass energies; Integrated luminosity; Proton proton collisions; The standard model; Uncertainty
English
14-ago-2026
2026
137
7
071804
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2026). First Evidence of the Decay B+ →π+e+e. PHYSICAL REVIEW LETTERS, 137(7) [10.1103/97c9-jl1m].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/625404
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