The Nuclear Modification Factor at Large Rapidities Original Research Article

RHIC data on high-pT hadron production display strong suppression in a wide rapidity region, indicating strong induced energy loss for both transversally and longitudinally traveling partons. We investigate the interplay of energy loss and rapidity dependence in a perturbative QCD improved parton model, and estimate the opacity of the produced hot matter in AuAu collisions at energies View the MathML source and 63 AGeV at different rapidity values. Direction-dependent suppression offers the possibility to study the geometry of the hot matter.