Test of Lepton Flavor Universality with B0 →k∗0l+l- Decays at Large Dilepton Invariant Mass

(LHCb Collaboration)

doi:10.1103/vzv9-hcks

Test of Lepton Flavor Universality with B0 →k∗0l+l- Decays at Large Dilepton Invariant Mass

(LHCb Collaboration)

Science Park 105
Syracuse University
University of Warwick
Physik-Institut der Universität Zürich
University of Edinburgh
University of Liverpool
Universidade de Santiago de Compostela
University of Bristol
SUPA
University of Glasgow
Department of Physics and Astronomy
Uppsala University
Université Paris-Saclay
University of Michigan, Ann Arbor
Clermont-Auvergne University
LNF-INFN
Fakultät Physik
University of Dortmund
Lamarr Institute for Machine Learning and Artificial Intelligence
Physikalisches Institut
University of Freiburg
Vilnius University
European Organization for Nuclear Research
University of Cambridge
Sorbonne Université
Instituto de Biofisica da UFRJ
State Key Laboratory of Nuclear Physics and Technology
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
Sezione INFN di Ferrara
Universidade da Coruña
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
University of Chinese Academy of Sciences
INFN Roma Tor Vergata
Consejo Nacional de Rectores (CONARE)
Aix-Marseille Université
Institute of Physics
ENAC-IIC-GEL
Massachusetts Institute of Technology
Ip Paris
University of Oxford

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

Muon-electron universality is tested in B0→K∗0ℓ+ℓ- decays, in the dilepton-invariant-mass region above the ψ(2S) resonance. The analysis uses beauty mesons produced in proton-proton collisions recorded by the LHCb detector 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 the muon and electron channels RK∗0 is measured to be 1.08-0.12+0.14(stat)±0.07(syst) for a dilepton-invariant-mass squared above 14.0 GeV2/c4, consistent with the standard model prediction. This result represents the most precise measurement of RK∗0 in this region and the first such measurement performed at a hadron collider.

langue originale	Anglais
Numéro d'article	051803
journal	Physical Review Letters
Volume	137
Numéro de publication	5
Les DOIs	https://doi.org/10.1103/vzv9-hcks
état	Publié - 31 juil. 2026

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10.1103/vzv9-hcks

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@article{0d43a1c31b1c40f1849cf7aa7b4067f9,

title = "Test of Lepton Flavor Universality with B0 →k∗0l+l- Decays at Large Dilepton Invariant Mass",

abstract = "Muon-electron universality is tested in B0→K∗0ℓ+ℓ- decays, in the dilepton-invariant-mass region above the ψ(2S) resonance. The analysis uses beauty mesons produced in proton-proton collisions recorded by the LHCb detector 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 the muon and electron channels RK∗0 is measured to be 1.08-0.12+0.14(stat)±0.07(syst) for a dilepton-invariant-mass squared above 14.0 GeV2/c4, consistent with the standard model prediction. This result represents the most precise measurement of RK∗0 in this region and the first such measurement performed at a hadron collider.",

author = "\{(LHCb Collaboration)\} and R. Aaij and M. Abdelfatah 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 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 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 V. Balagura and F. Fleuret and E. Maurice and Niel, \{E. M.\}",

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

year = "2026",

month = jul,

day = "31",

doi = "10.1103/vzv9-hcks",

language = "English",

volume = "137",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Test of Lepton Flavor Universality with B0 →k∗0l+l- Decays at Large Dilepton Invariant Mass

AU - (LHCb Collaboration)

AU - Aaij, R.

AU - Abdelfatah, M.

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 - 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 - 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 - Balagura, V.

AU - Fleuret, F.

AU - Maurice, E.

AU - Niel, E. M.

PY - 2026/7/31

Y1 - 2026/7/31

N2 - Muon-electron universality is tested in B0→K∗0ℓ+ℓ- decays, in the dilepton-invariant-mass region above the ψ(2S) resonance. The analysis uses beauty mesons produced in proton-proton collisions recorded by the LHCb detector 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 the muon and electron channels RK∗0 is measured to be 1.08-0.12+0.14(stat)±0.07(syst) for a dilepton-invariant-mass squared above 14.0 GeV2/c4, consistent with the standard model prediction. This result represents the most precise measurement of RK∗0 in this region and the first such measurement performed at a hadron collider.

AB - Muon-electron universality is tested in B0→K∗0ℓ+ℓ- decays, in the dilepton-invariant-mass region above the ψ(2S) resonance. The analysis uses beauty mesons produced in proton-proton collisions recorded by the LHCb detector 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 the muon and electron channels RK∗0 is measured to be 1.08-0.12+0.14(stat)±0.07(syst) for a dilepton-invariant-mass squared above 14.0 GeV2/c4, consistent with the standard model prediction. This result represents the most precise measurement of RK∗0 in this region and the first such measurement performed at a hadron collider.

UR - https://www.scopus.com/pages/publications/105047158261

U2 - 10.1103/vzv9-hcks

DO - 10.1103/vzv9-hcks

M3 - Article

C2 - 42606424

AN - SCOPUS:105047158261

SN - 0031-9007

VL - 137

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 051803

ER -

Test of Lepton Flavor Universality with B0 →k∗0l+l- Decays at Large Dilepton Invariant Mass

Résumé

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