Hadroproduction of scalar P -wave quarkonia in the light-front k_T -factorization approach

Summary, in English

In this work, we present a thorough analysis of scalar P -wave χ_Q0, Q = c, b quarkonia electromagnetic form factors for the γ^∗γ^∗→ χ_Q0 couplings, as well as their hadroproduction observables in k_⊥-factorisation using the light-front (LF) potential approach for the quarkonium wave function. The electromagnetic form factors are presented as functions of photon virtualities. We discuss the role of the Melosh spin-rotation and relativistic corrections estimated by comparing our results with those in the standard nonrelativistic QCD (NRQCD) approach. Theoretical uncertainties of our approach are found by performing the analysis with two different unintegrated gluon densities and with five distinct models of the QQ¯ interaction potentials consistent with the meson spectra. The results for the rapidity and transverse momentum distributions of χ_Q0 produced in high-energy pp collisions at s = 13 TeV are shown.