Quarkonia production with the Hera-B experiment

TL;DR

This paper reports on measurements of quarkonium production, including J/Psi, Psi(2S), Chic, Upsilon, and b-bbar, using the Hera-B experiment to analyze their cross sections and dependencies on various factors.

Contribution

It provides new experimental data on quarkonium production cross sections and ratios across different targets and kinematic variables at 920 GeV/c.

Findings

Measured J/Psi production cross section dependence on kinematic variables.

Determined production ratios of Psi(2S) to J/Psi and Chic to J/Psi.

Reported on b-bbar and Upsilon production cross sections.

Abstract

Measurements of the dependence of the J/Psi production cross section on its kinematic variables as well as on the target atomic numbers for 920 GeV/c protons incident on different targets have been made with the Hera-B detector. The large collected di-lepton sample allows to study the production ratio of Psi(2S) to J/Psi and of Chic to J/Psi . We also report on measurements of the b-bbar and Upsilon production cross section.