Production of ${\chi }_c$- and ${\chi }_b$-mesons in high energy hadronic collisions

Abstract

This paper is devoted to phenomenological study of ${\chi }_{c,b}$-mesons production in high energy hadronic collisions in the framework of NRQCD. We analyze all available experimental data on ${\chi }_c$-mesons production and extract non-perturbative NRQCD matrix elements from fitting the data. We show, that measured $p_T$-spectrum of ${\chi }_c$-mesons is mainly formed by color singlet components, while $\sigma ({\chi }_{c2})/\sigma ({\chi }_{c1})$ ratio depends strongly on color octet matrix elements; this ratio becomes a highly sensitive tool to study contribution of different terms from the NRQCD expansion. Obtained using NRQCD scaling rules predictions for ${\chi }_b$-mesons cross sections are also given.

Comments: 10 pages, 7 figures