In an earlier publication, we introduced the software package, {\tt \texttt{ePump}} (error PDF Updating Method Package), that can be used to update or optimize a set of parton distribution functions (PDFs), including the best-fit PDF set and Hessian eigenvector pairs of PDF sets (i.e., error PDFs), and to update any other set of observables, in the Hessian approach. Here, we validate the {\tt \texttt{ePump}} program with a detailed comparison against a full global analysis, and we demonstrate the potential of {\tt \texttt{ePump}} by presenting selected phenomenological applications relevant to the Large Hadron Collider. For example, we use the package to estimate the impact of the recent LHC data of the measurements of W, Z boson and top quark pair differential distributions on the CT14HERA2 PDFs.
@article{arxiv.1907.12177,
title = {Updating and Optimizing Error PDFs in the Hessian Approach. Part II},
author = {Tie-Jiun Hou and Zhite Yu and Sayipjamal Dulat and Carl Schmidt and C. -P. Yuan},
journal= {arXiv preprint arXiv:1907.12177},
year = {2019}
}