The decade-old technique of combining NLO-corrected hard process with LO-level parton shower Monte Carlo is now mature and used in practice of the QCD calculations in the LHC data analysis. The next step, its extension to an NNLO-corrected hard process combined with the NLO-level parton shower Monte Carlo, will require development of the latter component. It does not exist yet in a complete form. In this note we describe recent progress in developing the NLO parton shower for the initial-state hadron beams. The technique of adding NLO corrections in the fully exclusive form (defined in recent years) is now simplified and tested numerically, albeit for a limited set of NLO diagrams in the evolution kernels.
@article{arxiv.1310.6090,
title = {NLO corrections in the initial-state parton shower Monte Carlo},
author = {S. Jadach and A. Kusina and W. Placzek and M. Skrzypek},
journal= {arXiv preprint arXiv:1310.6090},
year = {2015}
}