Parton Energy Loss In Cold Nuclear Matter

The parton energy loss in high energy collisions has attracted an increasing attention fromboth the nuclear and particle physics communities. The wealth of experimental data onjet-quenching reflect clearly the energy loss of fast partons while traversing this hot and densemedium in high energy nucleus–nucleus collisions. Study of high energy of molecules in thecold energy losses in the nuclear environment helps to deeply understand the high energy ofmolecules in high temperature and density of nuclear material in middle molecular energyloss effects.Using HKM and nDS nuclear parton distribution function, calculation of a800gevproton nuclear Drell against different target nucleus Drell-Yan process differential crosssection ratio. Through experiment with the US Fermi national E772and E866groupcomparison of experimental data, obtained the high-energy protons in cold environmentenergy loss value, found that extract high-energy proton energy loss depends on the boundnucleon division function of molecule. Using proton-nucleus collisions produce process,calculate of a800Gev proton againstJ/ψ different differential cross section ratio. Bycomparing considering high-energy protons and some molecules in the cold environment ofnuclear energy loss effects on differential cross section ratio.we found for HKM boundnucleon parton distribution functions the ratio of the energy loss in the gluons and quarkswithin the error range is consistent with the expected value of the theory of QCD. ut for nDSbound nucleon parton distribution functions, the gluon and quark energy loss ratio issignificantly larger than the expected value of the theory of QCD.