ИСТИНА

The production and polarization of Upsilon(3S) mesons at high energies is studied in the framework of kT-factorization QCD approach. Our consideration is based on the non-relativistic QCD formalism for bound states formation and off-shell production amplitudes for hard partonic subprocesses using the Transverse Momentum Dependent, or unintegrated, gluon densities in a proton. Treating the non-perturbative color octet transitions in terms of mulitpole radiation theory and taking into account feed-down contributions from radiative chi_b(3P) decays, we extract the corresponding non-perturbative matrix elements (NMEs) from combined fit to transverse momenta distributions measured by the CMS and ATLAS Collaborations at the LHC. We found a significant dependence on sets of TMD gluon density functions. Then we calculate the polarization parameters, which determine the spin density matrix of Upsilon(3S) mesons. Additionally, we show the transverse momenta distributions for the CDF and LHCb data.