Measurement of the branching fraction of the Λb0→J/ψΛ decay and isospin asymmetry of B → J/ψK decays

The LHCb collaboration

doi:10.1007/JHEP01(2026)159

Measurement of the branching fraction of the Λb0→J/ψΛ decay and isospin asymmetry of B → J/ψK decays

The 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
University of Rome Tor Vergata
Consejo Nacional de Rectores (CONARE)
CPPM
Institute of Physics
Swiss Federal Institute of Technology Lausanne
Massachusetts Institute of Technology
Laboratoire Leprince-Ringuet
University of Oxford
Heidelberg University

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2 Citas (Scopus)

Resumen

This paper describes a measurement of the Λb0→J/ψΛ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4 fb⁻¹. The branching fraction is determined relative to that of B0→J/ψKS0 decays, (Formula presented.) yielding BΛb0→J/ψΛ=3.34±0.02±0.10±0.08±0.28×10−4, where the first uncertainty is statistical, the second systematic, the third due to external inputs on branching fractions and the fourth due to the ratio of Λb0 baryon and B⁰ meson hadronisation fractions. In addition, the isospin asymmetry between the rates of B0→J/ψKS0 and B⁺→ J/ψK⁺ decays is measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

Idioma original	Inglés
Número de artículo	159
Publicación	Journal of High Energy Physics
Volumen	2026
N.º	1
DOI	https://doi.org/10.1007/JHEP01(2026)159
Estado	Publicada - ene 2026
Publicado de forma externa	Sí

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@article{691d3c076f6e4c8583131499b48acac7,

title = "Measurement of the branching fraction of the Λb0→J/ψΛ decay and isospin asymmetry of B → J/ψK decays",

abstract = "This paper describes a measurement of the Λb0→J/ψΛ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4 fb−1. The branching fraction is determined relative to that of B0→J/ψKS0 decays, (Formula presented.) yielding BΛb0→J/ψΛ=3.34±0.02±0.10±0.08±0.28{\texttimes}10−4, where the first uncertainty is statistical, the second systematic, the third due to external inputs on branching fractions and the fourth due to the ratio of Λb0 baryon and B0 meson hadronisation fractions. In addition, the isospin asymmetry between the rates of B0→J/ψKS0 and B+→ J/ψK+ decays is measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.",

keywords = "B Physics, Branching fraction, Flavour Physics, Hadron-Hadron Scattering",

author = "\{The 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} The Author(s) 2026.",

year = "2026",

month = jan,

doi = "10.1007/JHEP01(2026)159",

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

volume = "2026",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

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T1 - Measurement of the branching fraction of the Λb0→J/ψΛ decay and isospin asymmetry of B → J/ψK decays

AU - The 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 - 2026/1

Y1 - 2026/1

N2 - This paper describes a measurement of the Λb0→J/ψΛ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4 fb−1. The branching fraction is determined relative to that of B0→J/ψKS0 decays, (Formula presented.) yielding BΛb0→J/ψΛ=3.34±0.02±0.10±0.08±0.28×10−4, where the first uncertainty is statistical, the second systematic, the third due to external inputs on branching fractions and the fourth due to the ratio of Λb0 baryon and B0 meson hadronisation fractions. In addition, the isospin asymmetry between the rates of B0→J/ψKS0 and B+→ J/ψK+ decays is measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

AB - This paper describes a measurement of the Λb0→J/ψΛ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4 fb−1. The branching fraction is determined relative to that of B0→J/ψKS0 decays, (Formula presented.) yielding BΛb0→J/ψΛ=3.34±0.02±0.10±0.08±0.28×10−4, where the first uncertainty is statistical, the second systematic, the third due to external inputs on branching fractions and the fourth due to the ratio of Λb0 baryon and B0 meson hadronisation fractions. In addition, the isospin asymmetry between the rates of B0→J/ψKS0 and B+→ J/ψK+ decays is measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

KW - B Physics

KW - Branching fraction

KW - Flavour Physics

KW - Hadron-Hadron Scattering

UR - https://www.scopus.com/pages/publications/105032111418

U2 - 10.1007/JHEP01(2026)159

DO - 10.1007/JHEP01(2026)159

M3 - Artículo

AN - SCOPUS:105032111418

SN - 1029-8479

VL - 2026

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 1

M1 - 159

ER -

Measurement of the branching fraction of the Λb0→J/ψΛ decay and isospin asymmetry of B → J/ψK decays

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