Phenomenology of Matching Exponentiated Photonic Radiation to a Parton Shower in KKMChh

Abstract

KKMChh adapts the soft photon exponentiation of the program KKMC, initially for electron-positron annihilation, to hadron collisions, where it must interface to a parton shower and parton distribution functions (PDFs) which may already include effects of QED radiation. We describe the NISR (Negative Initial State Radiation) algorithm developed to consistently interface with PDFs including QED effects, and present results on its effect on some distributions of phenomenological interest.

Comments: Presented by Scott Yost on October 7, 2025 at RADCOR2025, the 17th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology, Puri, India