Cronin effect in close-to-midrapidity regions at FNAL and RHIC energies

Abstract

Cronin effect — nuclear enhancement — on pion production in pA and dAu collisions is investigated in close-to-midrapidity regions, |η|≦1.5. Using a perturbative QCD improved parton model we analyze pion production in pBe and pCu collisions at energies E lab=500, 530 and 800 GeV in fix target FNAL-E706 experiment. Next we perform calculations at RHIC collider energy, √s NN =200 GeV, and the obtained nuclear modification factor for pions, R π dAu is compared to experimental data by PHOBOS. Our description contains conventional nuclear shadowing and multiscattering. Magnitudes and tendencies of the measured data are reproduced properly at the above energies.