Test of Lepton Flavor Universality with B+ →k+π+π-ℓ+ℓ- Decays

(LHCb Collaboration)

doi:10.1103/PhysRevLett.134.181803

Test of Lepton Flavor Universality with B+ →k+π+π-ℓ+ℓ- Decays

(LHCb Collaboration)

National Institute for Subatomic Physics
University of Warwick
University of Zurich
University of Liverpool
Syracuse University
Instituto Galego de Física de Altas Enerxías (IGFAE)
University of Bristol
Uppsala University
Université Paris-Saclay
University of Michigan, Ann Arbor
Université Clermont Auvergne
National Institute for Nuclear Physics
TU Dortmund University
Lamarr Institute for Machine Learning and Artificial Intelligence
CERN
University of Glasgow
University of Manchester
University of Cambridge
Sorbonne Université
Universidade Federal do Rio de Janeiro
Peking University
University of Milan - Bicocca
University of Chinese Academy of Sciences
University of Rome Tor Vergata
Consejo Nacional de Rectores (CONARE)
CPPM
Swiss Federal Institute of Technology Lausanne
Massachusetts Institute of Technology
University of Oxford
Université Savoie Mont Blanc
Heidelberg University
Laboratoire Leprince-Ringuet
Pontifícia Universidade Católica do Rio de Janeiro
University of Edinburgh
RWTH Aachen University
AGH University of Krakow
Scuola Normale Superiore di Pisa
CAS - Institute of High Energy Physics
Centro Brasileiro de Pesquisas Físicas
Ramon Llull University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Imperial College London
University of Cincinnati
Maastricht University
University of Ferrara
Monash University
University of Padua
Ohio State University
Wuhan University
University of Barcelona
Facultad de Ciencias Fisicas
University of Bologna
University of Genoa
University of Milan
NASU - Institute of Nuclear Research
University of A Coruna
Horia Hulubei National Institute of Physics and Nuclear Engineering
National Autonomous University of Honduras
Los Alamos National Laboratory
Hunan University
Tsinghua University
University of Cagliari
University of Groningen
Centro Federal de Educação Tecnológica Celso Suckow da Fonseca
University of Bari
Central China Normal University
Eötvös Loránd University
University College Dublin
South China Normal University
Cracow University of Technology
Rutherford Appleton Laboratory
University of Bonn
University of Perugia
University of Valencia
University of Maryland, College Park
University of Freiburg
National Centre for Nuclear Research
University of Pisa
Universidad Nacional de Colombia
University of Birmingham
NASU - Kharkov Institute of Physics and Technology
Vrije Universiteit Amsterdam
Lanzhou University
Henan University
University of Bergamo
Ruhr University Bochum
Universidad de Ingeniería y Tecnología
University of Siena
Division of Particle Physics
University of Basilicata
Max Planck Institute for Nuclear Physics
University of Alcalá
University of Urbino

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

Abstract

The first test of lepton flavor universality between muons and electrons using B+→K+π+π-ℓ+ℓ- (ℓ=e, μ) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The ratio of branching fractions between B+→K+π+π-e+e- and B+→K+π+π-μ+μ- decays is measured in the dilepton invariant-mass-squared range 1.1<q2<7.0 GeV2/c4 and is found to be RKππ-1=1.31-0.17+0.18(stat) -0.09+0.12(syst), in agreement with the standard model prediction. The first observation of the B+→K+π+π-e+e- decay is also reported.

Original language	English
Article number	181803
Journal	Physical Review Letters
Volume	134
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.134.181803
State	Published - 9 May 2025
Externally published	Yes

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10.1103/PhysRevLett.134.181803

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@article{5c8a775706884fc5b7b9cbafdda06d42,

title = "Test of Lepton Flavor Universality with B+ →k+π+π-ℓ+ℓ- Decays",

abstract = "The first test of lepton flavor universality between muons and electrons using B+→K+π+π-ℓ+ℓ- (ℓ=e, μ) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The ratio of branching fractions between B+→K+π+π-e+e- and B+→K+π+π-μ+μ- decays is measured in the dilepton invariant-mass-squared range 1.1",

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 P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and Z. Aliouche 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 A. Andreianov and P. Andreola and M. Andreotti and D. Andreou and A. Anelli and D. Ao and F. Archilli and M. Argenton and \{Arguedas Cuendis\}, S. and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and \{Baladron Rodriguez\}, P. and V. Balagura and \{Calderon Ramirez\}, S.",

note = "Publisher Copyright: {\textcopyright} 2025 CERN. ",

year = "2025",

month = may,

day = "9",

doi = "10.1103/PhysRevLett.134.181803",

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

volume = "134",

journal = "Physical Review Letters",

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T1 - Test of Lepton Flavor Universality with B+ →k+π+π-ℓ+ℓ- Decays

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 - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Aliouche, Z.

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 - Andreianov, A.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andreou, D.

AU - Anelli, A.

AU - Ao, D.

AU - Archilli, F.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Calderon Ramirez, S.

PY - 2025/5/9

Y1 - 2025/5/9

N2 - The first test of lepton flavor universality between muons and electrons using B+→K+π+π-ℓ+ℓ- (ℓ=e, μ) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The ratio of branching fractions between B+→K+π+π-e+e- and B+→K+π+π-μ+μ- decays is measured in the dilepton invariant-mass-squared range 1.1

AB - The first test of lepton flavor universality between muons and electrons using B+→K+π+π-ℓ+ℓ- (ℓ=e, μ) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The ratio of branching fractions between B+→K+π+π-e+e- and B+→K+π+π-μ+μ- decays is measured in the dilepton invariant-mass-squared range 1.1

UR - https://www.scopus.com/pages/publications/105005143172

U2 - 10.1103/PhysRevLett.134.181803

DO - 10.1103/PhysRevLett.134.181803

M3 - Artículo

AN - SCOPUS:105005143172

SN - 0031-9007

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

IS - 18

M1 - 181803

ER -

Test of Lepton Flavor Universality with B+ →k+π+π-ℓ+ℓ- Decays

Abstract

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