Hadroproduction of scalar P -wave quarkonia in the light-front kT -factorization approach
Izabela Babiarz, Roman Pasechnik, Wolfgang Schäfer, Antoni Szczurek
Abstract
A bstract In this work, we present a thorough analysis of scalar P -wave χ Q 0 , Q = c, b quarkonia electromagnetic form factors for the γ ∗ γ ∗ → χ Q 0 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 $$ Q\overline{Q} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Q</mml:mi> <mml:mover> <mml:mi>Q</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> interaction potentials consistent with the meson spectra. The results for the rapidity and transverse momentum distributions of χ Q 0 produced in high-energy pp collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV are shown.