Measurement of the Λb0$$ {\Lambda}_b^0 $$→ J/ψΛ angular distribution and the Λb0$$ {\Lambda}_b^0 $$ polarisation in pp collisions

Measurement of the Λb0$$ {\Lambda}_b^0 $$→ J/ψΛ angular distribution and the Λb0$$ {\Lambda}_b^0 $$ polarisation in pp collisions

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 corre...

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Bibliographic Details
Main Authors: 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.
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: Springer Berlin Heidelberg 2021
Online Access:https://hdl.handle.net/1721.1/131711
Description
Summary: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.

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