Measurement of the Λ0b→ J/ψΛ Angular Distribution and the Λ0b Polarisation in pp Collisions

Journal of High Energy Physics 2020
Kārlis Dreimanis, Collaboration LHCb

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.

Keywords
B physics Flavor physics Hadron-Hadron scattering (experiments) Heavy quark production Polarization
DOI
10.1007/jhep06(2020)110
Hyperlink
https://link.springer.com/article/10.1007%2FJHEP06%282020%29110

The LHCb Collaboration, Aaij, R., Abellán Beteta, C., Dreimanis, K. ... [et al.] Measurement of the Λ0b→ J/ψΛ Angular Distribution and the Λ0b Polarisation in pp Collisions. Journal of High Energy Physics, 2020, Vol. 2020, No. 6, Article number 110. ISSN 1029-8479. Available from: doi:10.1007/jhep06(2020)110

Publication language
English (en)