Measurement of the Λb0$$ {\Lambda}_b^0 $$→ J/ψΛ angular distribution and the Λb0$$ {\Lambda}_b^0 $$ polarisation in pp collisions
Author(s)
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C. A; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Alkhazov, G.; ... Show more Show less
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Abstract
This paper presents an analysis of the Λb0$$ {\Lambda}_b^0 $$→ J/ψΛ angular distribution and the transverse production polarisation of Λb0$$ {\Lambda}_b^0 $$ 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$$ {\Lambda}_b^0 $$ transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0$$ {\Lambda}_b^0 $$ 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.
Date issued
2020-06-17Department
Massachusetts Institute of Technology. Department of PhysicsPublisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2020 Jun 17;2020(6):110
Version: Final published version