J/psi,psi(2S) to mu+ mu- and B to J/psi,psi(2S) Cross Sections

TL;DR

This paper measures the production cross sections of J/psi and psi(2S) particles in proton-antiproton collisions at 1.8 TeV, revealing that direct production rates are significantly higher than theoretical predictions.

Contribution

It provides the first detailed differential cross section measurements for J/psi and psi(2S) in p-pbar collisions at this energy, including B decay contributions.

Findings

Measured cross sections above 4 GeV/c in the central region.

Determined the fraction of B decay events contributing to J/psi and psi(2S) production.

Found direct cross sections exceed theoretical expectations by over an order of magnitude.

Abstract

This paper presents a measurement of J/psi,psi(2S) differential cross sections in p-pbar collisions at square root s = 1.8 TeV. The cross sections are measured above 4 GeV/c in the central region (|eta| < 0.6) using the dimuon decay channel. The fraction of events from B decays is measured, and used to calculate b quark cross sections and direct J/psi,psi(2S) cross sections. The direct cross sections are found to be more than an order of magnitude above theoretical expectations.