Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb                      -→J/ψΛK- decay

LHCb Collaboration

doi:10.1016/j.scib.2021.02.030

Evidence of a J/ψΛ structure and observation of excited Ξ^- states in the Ξ_b ^-→J/ψΛK^- decay

LHCb Collaboration

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

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

266 Citations (Scopus)

Résumé

First evidence of a structure in the J/ψΛ invariant mass distribution is obtained from an amplitude analysis of Ξ_b ^-→J/ψΛK^- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1σ including systematic uncertainties and look-elsewhere effect. Its mass and width are determined to be 4458.8±2.9_-1.1 ^+4.7MeV and 17.3±6.5_-5.7 ^+8.0MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Ξ^- states, Ξ1690^- and Ξ1820^-, are seen for the first time in a Ξ_b ^- decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb^-1, collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV.

langue originale	Anglais
Pages (de - à)	1278-1287
Nombre de pages	10
journal	Science Bulletin
Volume	66
Numéro de publication	13
Les DOIs	https://doi.org/10.1016/j.scib.2021.02.030
état	Publié - 15 juil. 2021

Accès au document

10.1016/j.scib.2021.02.030

Contient cette citation

@article{7cb01f13db534be9a296e4c553e67148,

title = "Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb -→J/ψΛK- decay",

abstract = "First evidence of a structure in the J/ψΛ invariant mass distribution is obtained from an amplitude analysis of Ξb -→J/ψΛK- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1σ including systematic uncertainties and look-elsewhere effect. Its mass and width are determined to be 4458.8±2.9-1.1 +4.7MeV and 17.3±6.5-5.7 +8.0MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Ξ- states, Ξ1690- and Ξ1820-, are seen for the first time in a Ξb - decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb-1, collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV.",

keywords = "Exotics, Particle and resonance production, Pentaquark, QCD, Quarkonium, Spectroscopy",

author = "\{LHCb Collaboration\} and R. Aaij and \{Abell{\'a}n Beteta\}, C. 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 J. Albrecht and F. Alessio and M. Alexander and \{Alfonso Albero\}, A. and Z. Aliouche and G. Alkhazov and \{Alvarez Cartelle\}, P. and S. Amato and Y. Amhis and L. An and L. Anderlini and A. Andreianov and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and S. Baker and \{Baladron Rodriguez\}, P. and V. Balagura and W. Baldini and \{Baptista Leite\}, J. and Barlow, \{R. J.\} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and Basels, \{J. M.\} and G. Bassi and B. Batsukh and A. Battig and F. Fleuret and E. Maurice and Niel, \{E. M.\}",

note = "Publisher Copyright: {\textcopyright} 2021 Science China Press",

year = "2021",

month = jul,

day = "15",

doi = "10.1016/j.scib.2021.02.030",

language = "English",

volume = "66",

pages = "1278--1287",

journal = "Science Bulletin",

issn = "2095-9273",

publisher = "Elsevier B.V.",

number = "13",

}

TY - JOUR

T1 - Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb -→J/ψΛK- decay

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abellán Beteta, C.

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 - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Aliouche, Z.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baker, S.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Baldini, W.

AU - Baptista Leite, J.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Basels, J. M.

AU - Bassi, G.

AU - Batsukh, B.

AU - Battig, A.

AU - Fleuret, F.

AU - Maurice, E.

AU - Niel, E. M.

PY - 2021/7/15

Y1 - 2021/7/15

N2 - First evidence of a structure in the J/ψΛ invariant mass distribution is obtained from an amplitude analysis of Ξb -→J/ψΛK- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1σ including systematic uncertainties and look-elsewhere effect. Its mass and width are determined to be 4458.8±2.9-1.1 +4.7MeV and 17.3±6.5-5.7 +8.0MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Ξ- states, Ξ1690- and Ξ1820-, are seen for the first time in a Ξb - decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb-1, collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV.

AB - First evidence of a structure in the J/ψΛ invariant mass distribution is obtained from an amplitude analysis of Ξb -→J/ψΛK- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1σ including systematic uncertainties and look-elsewhere effect. Its mass and width are determined to be 4458.8±2.9-1.1 +4.7MeV and 17.3±6.5-5.7 +8.0MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Ξ- states, Ξ1690- and Ξ1820-, are seen for the first time in a Ξb - decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb-1, collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV.

KW - Exotics

KW - Particle and resonance production

KW - Pentaquark

KW - QCD

KW - Quarkonium

KW - Spectroscopy

U2 - 10.1016/j.scib.2021.02.030

DO - 10.1016/j.scib.2021.02.030

M3 - Article

AN - SCOPUS:85104149325

SN - 2095-9273

VL - 66

SP - 1278

EP - 1287

JO - Science Bulletin

JF - Science Bulletin

IS - 13

ER -

Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb -→J/ψΛK- decay

Résumé

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Contient cette citation

Evidence of a J/ψΛ structure and observation of excited Ξ^- states in the Ξ_b ^-→J/ψΛK^- decay