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

LHCb Collaboration, 17-Jun-2020, In : Journal of High Energy Physics. 2020, 6, 30 p., 110.

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  • LHCb Collaboration

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.]

Original languageEnglish
Article number110
Number of pages30
JournalJournal of High Energy Physics
Issue number6
Publication statusPublished - 17-Jun-2020


  • B physics, Flavor physics, Hadron-Hadron scattering (experiments), Heavy quark production, Polarization, MONTE-CARLO, WEAK DECAYS, PARAMETERS, BARYON, TOOL

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