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.]

Idioma originalAnglès
Número d’article110
RevistaJournal of High Energy Physics
Volum2020
Número6
DOIs
Estat de la publicacióPublicada - 1 de juny 2020

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