Production ofχc- andχb-mesons in high energy hadronic collisions

Abstract

This paper is devoted to a phenomenological study of ${\ensuremath{\chi}}_{c,b}$-meson production in high energy hadronic collisions in the framework of nonrelativistic QCD (NRQCD). We analyze all available experimental data on ${\ensuremath{\chi}}_{c}$-meson production and extract nonperturbative NRQCD matrix elements by data fitting. It is shown that measured ${p}_{T}$ spectra of ${\ensuremath{\chi}}_{c}$-mesons is mainly formed by color singlet components, while the $\ensuremath{\sigma}({\ensuremath{\chi}}_{c2})/\ensuremath{\sigma}({\ensuremath{\chi}}_{c1})$ ratio depends strongly on color octet matrix elements; this ratio becomes a highly sensitive tool to study contributions of the different NRQCD expansion terms. Predictions for ${\ensuremath{\chi}}_{b}$-meson production cross sections, which are obtained using NRQCD scaling rules, are also given.