Constructing parton convolution in effective field theory - art. no. 152002

Parton convolution models have been used extensively in describing the sea quarks in the nucleon and explaining quark distributions in nuclei (the EMC effect). From the effective field theory point of view, we construct the p arton convolution formalism which has been the underlying conception of all convolution models. We explain the significance of scheme and scale depend ence of the auxiliary quantities such as the pion distributions in a nucleo n. As an application, we calculate the complete leading nonanalytic chiral contribution to the isovector component of the nucleon sea.