Complete next-to-leading-order study on the yield and polarization of Upsilon(1S,2S,3S) at the Tevatron and LHC

TL;DR

This paper provides a comprehensive next-to-leading order analysis of Upsilon meson production and polarization at high-energy colliders, reconciling experimental data with theoretical predictions within the nonrelativistic QCD framework.

Contribution

It presents the first complete NLO study on Upsilon production and polarization, using color-octet matrix elements fitted to experimental data.

Findings

Accurately explains Upsilon yield measurements.

Good agreement with CMS polarization data.

Discrepancy remains with CDF polarization measurements.

Abstract

Based on nonrelativistic QCD factorization scheme, we present the first complete next-to-leading order study on the yield and polarization of Upsilon(1S,2S,3S) hadroproduction. By using the color-octet long-distance matrix elements obtained from fits of the experimental measurements on Upsilon yield and polarization at the Tevatron and LHC, our results can explain the measurements on the yield very well, and for the polarizations of Upsilon(1S,2S,3S), they are in (good, good, bad) agreement with recent CMS measurement, but still have some distance from the CDF measurement.