Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

The LHCb collaboration

doi:10.1007/JHEP06(2020)110

Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

The 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
Sezione INFN di Milano
MST-8, Los Alamos National Laboratory
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
Université Paris-Saclay
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
ENAC-IIC-GEL
Sezione INFN di Ferrara
University of Heidelberg
Kurchatov Institute
Syracuse University
Yandex School of Data Analysis
Aix Marseille Université
University of Warwick
Centro Brasileiro de Pesquisas Fisicas
University of Manchester
Sezione di Genova
University of Genoa
National University of Science and Technology “MISIS”
RWTH Aachen University
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
National Centre for Nuclear Research (NCBJ)
Sezione INFN di Cagliari
Institute for Theoretical and Experimental Physics
LNF-INFN
Sorbonne Université
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
University of Maryland, College Park
Institute for Nuclear Research of the Russian Academy of Sciences
Wuhan University
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
University of Pisa
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
Tsinghua University
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
Maastricht University
Agh University of Science and Technology Faculty of Computer Science
Universitá di Cagliari
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
University of Milano
Tsinghua University
University of Valencia
Pontifícia Universidade Católica do Rio de Janeiro
Universidade Federal Do Triângulo Mineiro (UFTM)
Univ. Mentouri de Constantine
South China Normal University
Vrije Universiteit Amsterdam
National Research Tomsk Polytechnic University
University of Siena
University of Padova
Scuola Normale Superiore di Pisa
Kurchatov Institute
Iligan Institute of Technology (IIT)
University College Dublin
University of Cincinnati
Universität Rostock
Universidad Nacional de Colombia
Hanoi University of Science
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
Max-Planck-Institut für Kernphysik
University of Urbino Carlo Bo

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

Résumé

This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb⁻¹, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < p_T< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ⁻ decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]

langue originale	Anglais
Numéro d'article	110
journal	Journal of High Energy Physics
Volume	2020
Numéro de publication	6
Les DOIs	https://doi.org/10.1007/JHEP06(2020)110
état	Publié - 1 juin 2020

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10.1007/JHEP06(2020)110

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@article{d05c478caf2f4f5aadec5aa810a649ae,

title = "Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions",

abstract = "This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ− decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]",

keywords = "B physics, Flavor physics, Hadron-Hadron scattering (experiments), Heavy quark production, Polarization",

author = "\{The 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 G. Alkhazov and \{Alvarez Cartelle\}, P. and Alves, \{A. A.\} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi 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 Back, \{J. J.\} and S. Baker 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 V. Batozskaya and B. Batsukh and A. Battig and A. Bay and F. Fleuret and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2020, The Author(s).",

year = "2020",

month = jun,

day = "1",

doi = "10.1007/JHEP06(2020)110",

language = "English",

volume = "2020",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

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T1 - Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

AU - The 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 - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

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 - Back, J. J.

AU - Baker, S.

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 - Batozskaya, V.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, A.

AU - Fleuret, F.

AU - Maurice, E.

PY - 2020/6/1

Y1 - 2020/6/1

N2 - This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ− decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]

AB - This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ− decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]

KW - B physics

KW - Flavor physics

KW - Hadron-Hadron scattering (experiments)

KW - Heavy quark production

KW - Polarization

UR - https://www.scopus.com/pages/publications/85087042119

U2 - 10.1007/JHEP06(2020)110

DO - 10.1007/JHEP06(2020)110

M3 - Article

AN - SCOPUS:85087042119

SN - 1126-6708

VL - 2020

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 6

M1 - 110

ER -

Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

Résumé

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