Hadronic production of heavy quarkonia at LHC

Abstract

This paper is devoted to phenomenological study of χ c,b -mesons production in high energy hadronic collisions in the framework of NRQCD. We analyze all available experimental data on χ c -mesons production and extract non-perturbative NRQCD matrix elements from fitting the data. We show, that measured p T -spectrum of χ c -mesons is mainly formed by color singlet components, while σ (χ c2 )/σ (χ 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 χ b -mesons cross sections are also given.