Abstract
Using the QCD improved parton model we study production of hadrons with large transverse momenta pT in proton-proton and proton-nucleus collisions at different energies corresponding to experiments at RHIC and LHC. For investigation of large-pT hadrons produced on nuclear targets we include additionally the nuclear modification of parton distribution functions and the nuclear broadening calculated within the color dipole formalism. We demonstrate that complementary effect of initial state interactions causes a significant suppression at large pT and at forward rapidities. We provide a good description of the Cronin effect at medium-high pT and the nuclear suppression at large pT in agreement with available data from experiments at RHIC and LHC. In the LHC energy range this large-pT suppression expected at forward rapidities can be verified by the future measurements.
Highlights
IntroductionThe BRAHMS and STAR data [6] at forward rapidities demonstrate even much stronger suppression
Experimental and theoretical investigation of inclusive hadron (h) production at different transverse momenta pT in proton-nucleus (p + A) with respect to proton-proton (p + p) collisions allows to study various nuclear phenomena through the nucleus-to-proton ratio, the so called nuclear modification factor, RA(pT ) = σp+A→h+X(pT )/A σp+p→h+X(pT ), where A is the mass number.The Cronin effect, observed already in 1975 [1] as the ratio RA(pT ) > 1 at medium-high pT, was studied in [2] within the color dipole formalism
For investigation of large-pT hadrons produced on nuclear targets we include the nuclear modification of parton distribution functions and the nuclear broadening calculated within the color dipole formalism
Summary
The BRAHMS and STAR data [6] at forward rapidities demonstrate even much stronger suppression This forward region is expected to be studied at LHC since the target Bjorken x is ey times smaller than at y = 0. This allows to investigate a stronger onset of coherent phenomena (shadowing, Color Glass Condensate (CGC)), which are expected to suppress particle yields.
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