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Measurement of the Λ0b→ J/ψΛ angular distribution and the Λ0b polarisation in pp collisions

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LHCb collaboration (Including: Back, J. J., Blake, T., Brossa Gonzalo, A., Cicala, M. F., Costa Sobral, C. M. , Crocombe, A., Gershon, T. J., Hunter, R. J., Kenzie, M., Kreps, Michal, Latham, Thomas, Loh, David, Lupton, Oliver, Millard, E., Morris, A. G. (Alan George), Sahoo, Niladri and Vesterinen, Mikael Anton). (2020) Measurement of the Λ0b→ J/ψΛ angular distribution and the Λ0b polarisation in pp collisions. Journal of High Energy Physics, 2020 . 110. doi:10.1007/JHEP06(2020)110 ISSN 1029-8479.

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Official URL: https://doi.org/10.1007/JHEP06(2020)110

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Abstract

This paper presents an analysis of the Λ0b→ J/ψΛ angular distribution and the transverse production polarisation of Λ0b 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 Λ0b transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λ0b 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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Particles (Nuclear physics) -- Flavor , Quarks , Hadrons -- Scattering , Polarization (Nuclear physics)
Journal or Publication Title: Journal of High Energy Physics
Publisher: Springer
ISSN: 1029-8479
Official Date: 17 June 2020
Dates:
DateEvent
17 June 2020Published
20 May 2020Accepted
Volume: 2020
Article Number: 110
DOI: 10.1007/JHEP06(2020)110
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 2 July 2020
Date of first compliant Open Access: 2 July 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDCERNhttp://dx.doi.org/10.13039/100012470
UNSPECIFIED[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDH2020 Marie Skłodowska-Curie Actionshttp://dx.doi.org/10.13039/100010665
UNSPECIFIED[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275

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