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

The Lhcb Collaboration

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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
Pages (from-to)1-30
Number of pages30
JournalJournal of High Energy Physics
Issue number6
Early online date17 Jun 2020
Publication statusPublished - Jun 2020


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


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