Speaker
Description
We test the parametrizations of Fragmentation Functions (FFs) using data on semi-inclusive pion and kaon production in unpolarized pp and heavy-ion collisions at the STAR and NICA kinematics. The calculations are carried out in the next-to-leading order (NLO) of perturbative quantum chromodynamics (pQCD).
We show that at the c.m. energy 200 GeV both LSS-15 and DSEHS-14 FFs for pions and DSEHS-17 FFs for kaons provide the best fits to the STAR data. The comparison for lower energy scales, like at NICA, shows that a purely pQCD approach is inadequate and suggests the necessity to take into account also higher-order effects of initial-state soft-gluon radiation. Nevertheless, these data on the pT spectra of π+ , K+ and also the ratios π-/π+ and K-/K+ seem favour LSS-15 and DSEHS-14 FFs for pions and DSEHS-17 for kaons, similarly as at the energy scale 200 GeV.
