Measurement of the Λb0$$ {\Lambda}_b^0 $$→ J/ψΛ angular distribution and the Λb0$$ {\Lambda}_b^0 $$ polarisation in pp collisions
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13130_2020_Article_13209.pdf
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Author(s)
Aaij, R.
Abellán Beteta, C.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Aidala, C. A
Aiola, S.
Ajaltouni, Z.
Akar, S.
Date Issued
June 17, 2020
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2020 Jun 17;2020(6):110
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP06(2020)110
