Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays

LHCb Collaboration

doi:10.1103/PhysRevLett.124.111802

Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays

LHCb Collaboration

Science Park 105
University of Zurich
University of Liverpool
Universidade de Santiago de Compostela
University of Bristol
Clermont-Auvergne University
University of Michigan, Ann Arbor
Syracuse University
Sezione INFN di Milano
MST-8, Los Alamos National Laboratory
LNF-INFN
University of Dortmund
European Organization for Nuclear Research
University of Glasgow
University of Barcelona
Petersburg Nuclear Physics Institute (PNPI)
Imperial College London
Instituto de Biofisica da UFRJ
Laboratoire de l'Accélérateur Linéaire
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
ENAC-IIC-GEL
Sezione INFN di Ferrara
University of Heidelberg
Aix-Marseille Université
Kurchatov Institute
Yandex School of Data Analysis
Sezione INFN di Cagliari
University of Warwick
University of Manchester
Sezione di Genova
University of Genoa
Institute for Theoretical and Experimental Physics
National University of Science and Technology “MISIS”
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
National Centre for Nuclear Research (NCBJ)
Centro Brasileiro de Pesquisas Fisicas
University of Chinese Academy of Sciences
Sorbonne Université
RWTH Aachen University
Moscow State University
INFN
INFN Sezione di Bologna
University of Bologna
University of Cambridge
Institute for Nuclear Physics
University of Birmingham
University of Modena and Reggio Emilia
University of Oxford
Sezione di Roma
Massachusetts Institute of Technology
National Research University
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Tsinghua University
Wuhan University
University of Ferrara
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
Universitat Ramon LLull - CSIC
INFN Roma Tor Vergata
University of Pisa
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
University of Edinburgh
Horia Hulubei National Institute of Physics and Nuclear Engineering
Universidad Nacional Autónoma de Honduras
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
Max-Planck-Institut für Kernphysik
Agh University of Science and Technology Faculty of Computer Science
Central China Normal University
Institute of Nuclear Research, National Academy of Sciences in Ukraine
INFN Sezione di Trieste
Kharkov Institute of Physics and Technology
CCLRC Rutherford Appleton Laboratory
Monash University
Institute for Nuclear Research of the Russian Academy of Sciences
University of Maryland, College Park
University of Milano
Tsinghua University
University of Valencia
Pontifícia Universidade Católica do Rio de Janeiro
Universidade Federal Do Triângulo Mineiro (UFTM)
Institute of High Energy Physics, Chinese Academy of Sciences
Univ. Mentouri de Constantine
Vrije Universiteit Amsterdam
National Research Tomsk Polytechnic University
University of Siena
South China Normal University
University of Padova
Scuola Normale Superiore di Pisa
Kurchatov Institute
Universitá di Cagliari
Iligan Institute of Technology (IIT)
University College Dublin
University of Cincinnati
Universität Rostock
Universidad Nacional de Colombia
Hanoi University of Science and Technology
ICS/University of Groningen
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
University of Rome “Tor Vergata”
Università degli Studi della Basilicata
University of Rome
University of Urbino Carlo Bo
Hunan University
Shaanxi Normal University

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

Résumé

Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb-1, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A1(Λb0→J/ψς0)/A0(Λb0→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξb0→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξb0→J/ψΛ)/A1/2(Ξb0→J/ψΞ0)|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.

langue originale	Anglais
Numéro d'article	111802
journal	Physical Review Letters
Volume	124
Numéro de publication	11
Les DOIs	https://doi.org/10.1103/PhysRevLett.124.111802
état	Publié - 20 mars 2020

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10.1103/PhysRevLett.124.111802

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@article{64d51f5d5b9343ee83d27ce86c425f32,

title = "Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays",

abstract = "Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb-1, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A1(Λb0→J/ψς0)/A0(Λb0→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95\% confidence level. The Cabibbo suppressed Ξb0→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξb0→J/ψΛ)/A1/2(Ξb0→J/ψΞ0)|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.",

author = "\{LHCb Collaboration\} and R. Aaij and Beteta, \{C. Abell{\'a}n\} and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, \{C. A.\} and S. Aiola and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and Albero, \{A. Alfonso\} and G. Alkhazov and Cartelle, \{P. Alvarez\} and Alves, \{A. A.\} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and F. Archilli and Romeu, \{J. Arnau\} and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, \{J. J.\} and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, \{R. J.\} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and G. Bassi and V. Batozskaya and B. Batsukh and A. Battig and A. Bay and F. Fleuret and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2020 CERN. for the LHCb Collaboration.",

year = "2020",

month = mar,

day = "20",

doi = "10.1103/PhysRevLett.124.111802",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "11",

}

TY - JOUR

T1 - Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays

AU - LHCb Collaboration

AU - Aaij, R.

AU - Beteta, C. Abellán

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Albero, A. Alfonso

AU - Alkhazov, G.

AU - Cartelle, P. Alvarez

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Archilli, F.

AU - Romeu, J. Arnau

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baranov, A.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Bassi, G.

AU - Batozskaya, V.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, A.

AU - Fleuret, F.

AU - Maurice, E.

PY - 2020/3/20

Y1 - 2020/3/20

N2 - Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb-1, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A1(Λb0→J/ψς0)/A0(Λb0→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξb0→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξb0→J/ψΛ)/A1/2(Ξb0→J/ψΞ0)|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.

AB - Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb-1, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A1(Λb0→J/ψς0)/A0(Λb0→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξb0→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξb0→J/ψΛ)/A1/2(Ξb0→J/ψΞ0)|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.

UR - https://www.scopus.com/pages/publications/85082804250

U2 - 10.1103/PhysRevLett.124.111802

DO - 10.1103/PhysRevLett.124.111802

M3 - Article

C2 - 32242683

AN - SCOPUS:85082804250

SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 111802

ER -

Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays

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