Speaker
Dr
Leszek Motyka
(Jagiellonian University)
Description
Prompt J/psi hadroduction is analyzed beyond the leading twist two-gluon production mechanism. A contribution to the process is sudied in detail in which the meson production is mediated by three-gluon partonic state, with two gluons coming from the target and one gluon from the projectile. This contribution enters at non-leading twist, but is enhanced at large energies due to large double gluon density at small x. The three-gluon contribution to prompt J/psi production is calculated within perturbative QCD, in the k_T factorisation framework, and it is found to provide a significant correction to the standard leading twist cross-section at the energies of the Tevatron or the LHC. The results are given as differential pT-dependent cross-sections for J/psi polarisation components.
Primary author
Dr
Leszek Motyka
(Jagiellonian University)
Co-author
Mariusz Sadzikowski
(Jagiellonian University)
