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• W3158064963 abstract "The $Upsilon(2S)$ production and polarization at high energies is studied in the framework of $k_T$-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 $chi_b(3P)$ and $chi_b(2P)$ decays and contributions from $Upsilon(3S)$ decays are taken into account. The transverse momentum dependent gluon densities in a proton were derived from the Ciafaloni-Catani-Fiorani-Marchesini evolution equation as well as from the Kimber-Martin-Ryskin prescription. Treating the non-perturbative color octet transitions in terms of the mulitpole radiation theory, we extract the corresponding non-perturbative matrix elements for $Upsilon(2S)$ and $chi_b(2P)$ mesons from a combined fit to $Upsilon(2S)$ transverse momenta distributions measured by the CMS and ATLAS Collaborations at the LHC energies $sqrt s = 7$ and $13$ TeV and from the relative production rate $R^{chi_b(2P)}_{Upsilon(2S)}$ measured by the LHCb Collaboration at $sqrt s = 7$ and $8$ TeV. Then we apply the extracted values to investigate the polarization parameters $lambda_theta$, $lambda_phi$ and $lambda_{thetaphi}$, which determine the $Upsilon(2S)$ spin density matrix. Our predictions have a good agreement with the currently available data within the theoretical and experimental uncertainties." @default.
• W3158064963 created "2021-05-10" @default.
• W3158064963 creator A5055774902 @default.
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• W3158064963 date "2020-05-01" @default.
• W3158064963 modified "2023-09-27" @default.
• W3158064963 title "Bottomonia production and polarization in the NRQCD with $$k_T$$-factorization. II: $$Upsilon (2S)$$ and $$chi _b(2P)$$ mesons" @default.
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• W3158064963 doi "https://doi.org/10.1140/epjc/s10052-020-8056-x" @default.
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