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
Physik-Institut
University of Zurich
Oliver Lodge Laboratory
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
Fakultät Physik
University of Dortmund
European Organization for Nuclear Research
SUPA
University of Glasgow
ICCUB
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
Institute of Physics
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)

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

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 < 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.]

Original language	English
Article number	110
Journal	Journal of High Energy Physics
Volume	2020
Issue number	6
DOIs	https://doi.org/10.1007/JHEP06(2020)110
Publication status	Published - 1 Jun 2020

Keywords

B physics
Flavor physics
Hadron-Hadron scattering (experiments)
Heavy quark production
Polarization

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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 F. Fleuret and E. Maurice and Niel, \{E. M.\}",

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

year = "2020",

month = jun,

day = "1",

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

language = "English",

volume = "2020",

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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 - Fleuret, F.

AU - Maurice, E.

AU - Niel, E. M.

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

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

Abstract

Keywords

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