Production and polarization of Upsilon mesons in the k_T-factorization approach in more detail

TL;DR

This paper investigates Upsilon meson production and polarization at Fermilab using the k_T-factorization approach, comparing theoretical predictions with experimental data to test models of parton dynamics in QCD.

Contribution

It provides a detailed analysis of Upsilon meson polarization and production within the k_T-factorization framework, highlighting its potential to discriminate between competing QCD models.

Findings

Theoretical predictions align with D0 data for certain distributions.

Polarization measurements can distinguish between different parton dynamics models.

Double differential cross sections are sensitive to the underlying QCD approach.

Abstract

In the framework of the k_T-factorization approach, the production and polarization of Upsilon mesons at the Fermilab Tevatron is considered, and a comparision of the calculated double differential distributions and spin alignment parameter $\alpha$ with the D0 experimental data is shown. We argue that measuring the double differential cross section and the polarization of upsilonium states can serve as a crucial test discriminating two competing theoretical approaches to the parton dynamics in QCD.