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

TL;DR

This paper extends the KKMC program's soft photon exponentiation to hadron collisions by developing an NISR algorithm that interfaces with QED-including PDFs, impacting phenomenological distributions.

Contribution

It introduces the NISR algorithm for consistent interfacing of photon exponentiation with QED-inclusive PDFs in hadron collision simulations.

Findings

NISR algorithm effectively integrates QED effects into PDFs.

Impact observed on key phenomenological distributions.

Enhanced accuracy in photon radiation modeling in hadron collisions.

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.