Bottomonia production and polarization in the NRQCD with [Formula omitted]-factorization. II: [Formula omitted] and [Formula omitted] mesons

The [Formula omitted] production and polarization at high energies is studied in the framework of [Formula omitted]-factorization approach. Our consideration is based on the non-relativistic QCD formalism for bound states formation and off-shell production amplitudes for hard partonic subprocesses....

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2020-05, Vol.80 (5)
Main Authors: Abdulov, N. A, Lipatov, A. V
Format: Article
Language:English
Online Access:Get full text
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Summary:The [Formula omitted] production and polarization at high energies is studied in the framework of [Formula omitted]-factorization approach. Our consideration is based on the non-relativistic QCD formalism for bound states formation and off-shell production amplitudes for hard partonic subprocesses. The direct production mechanism, feed-down contributions from radiative [Formula omitted] and [Formula omitted] decays and contributions from [Formula omitted] decays are taken into account. The transverse momentum dependent gluon densities in a proton were derived from the Ciafaloni-Catani-Fiorani-Marchesini evolution equation, Kimber-Martin-Ryskin prescription and Parton Branching method. Treating the non-perturbative color octet transitions in terms of the mulitpole radiation theory, we extract the corresponding non-perturbative matrix elements for [Formula omitted] and [Formula omitted] mesons from a combined fit to [Formula omitted] transverse momenta distributions measured by the CMS and ATLAS Collaborations at the LHC energies [Formula omitted] and 13 TeV and from the relative production rate [Formula omitted] measured by the LHCb Collaboration at [Formula omitted] and 8 TeV. Then we apply the extracted values to investigate the polarization parameters [Formula omitted], [Formula omitted] and [Formula omitted], which determine the [Formula omitted] spin density matrix. Our predictions have a good agreement with the currently available data within the theoretical and experimental uncertainties.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-020-8056-x