First Evidence of the Decay B+ →π+e+e

(LHCb Collaboration)

doi:10.1103/97c9-jl1m

First Evidence of the Decay B+ →π+e+e

(LHCb Collaboration)

National Institute for Subatomic Physics
University of Warwick
University of Zurich
University of Liverpool
Syracuse University
University of Santiago de Compostela
University of Bristol
Department of Physics and Astronomy
Uppsala University
Université Paris-Saclay
University of Michigan, Ann Arbor
Université Clermont Auvergne
Faculty of Physics and Applied Computer Science
AGH University of Krakow
National Institute for Nuclear Physics
Fakultät Physik
TU Dortmund University
Lamarr Institute for Machine Learning and Artificial Intelligence
Vilnius University
CERN
University of Cambridge
Sorbonne Université
Universidade Federal do Rio de Janeiro
Peking University
University of A Coruna
University of Milan - Bicocca
University of Chinese Academy of Sciences
Consejo Nacional de Rectores (CONARE)
Institute Formerly Covered by A Cooperation Agreement with Cern
CPPM
Institute of Physics
Swiss Federal Institute of Technology Lausanne
Massachusetts Institute of Technology
Laboratoire Leprince-Ringuet
University of Oxford
Heidelberg University

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	071804
Journal	Physical Review Letters
Volume	137
Issue number	7
DOIs	https://doi.org/10.1103/97c9-jl1m
State	Published - 14 Aug 2026
Externally published	Yes

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10.1103/97c9-jl1m

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@article{fd8b7fa18ad7495ab4966cf85fce5e2d,

title = "First Evidence of the Decay B+ →π+e+e",

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){\texttimes}10-8, where the first set of uncertainties is statistical and the second is systematic. The result is consistent with the Standard Model expectation.",

author = "\{(LHCb Collaboration)\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and M. Akthar and P. Albicocco and J. Albrecht and R. Aleksiejunas and F. Alessio and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and P. Andreola and M. Andreotti and \{Andres Estrada\}, S. and A. Anelli and D. Ao and C. Arata and F. Archilli and Z. Areg and M. Argenton and \{Arguedas Cuendis\}, S. and L. Arnone and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and Authier, \{J. A.\} and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and \{Calderon Ramirez\}, S.",

note = "Publisher Copyright: {\textcopyright} 2026 CERN.",

year = "2026",

month = aug,

day = "14",

doi = "10.1103/97c9-jl1m",

language = "Ingl{\'e}s",

volume = "137",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "7",

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TY - JOUR

T1 - First Evidence of the Decay B+ →π+e+e

AU - (LHCb Collaboration)

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adlarson, P.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Akthar, M.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Aleksiejunas, R.

AU - Alessio, F.

AU - Alvarez Cartelle, P.

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andres Estrada, S.

AU - Anelli, A.

AU - Ao, D.

AU - Arata, C.

AU - Archilli, F.

AU - Areg, Z.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Arnone, L.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Authier, J. A.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Calderon Ramirez, S.

PY - 2026/8/14

Y1 - 2026/8/14

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/105048166698

U2 - 10.1103/97c9-jl1m

DO - 10.1103/97c9-jl1m

M3 - Artículo

C2 - 42675448

AN - SCOPUS:105048166698

SN - 0031-9007

VL - 137

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

M1 - 071804

ER -

First Evidence of the Decay B+ →π+e+e

Abstract

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