EMC effect and nuclear structure functions

We analyze experimental data of nuclear structure function ratios for obtaining optimum parton distribution functions (PDFs) in nuclei. Then, uncertainties of the nuclear PDFs are estimated by the Hessian method. Parametrization of nuclear parton distribution is investigated in the leading order of αs. The parton distribution are provided at Q2=1GeV2 with a number of parameters, which are determined by a χ2 analysis of the data on nuclear structure function. From the analysis, we propose parton distributions at Q2=1GeV2 for nuclei from deuteron to heavy ones with a mass number A∼208.