KKMC-hh: A Precision Event Generator for EW Radiative Corrections in Hadron Scattering

TL;DR

KKMC-hh is a high-precision event generator for Z boson production and decay in hadron collisions, incorporating advanced electroweak radiative corrections and multi-photon radiation effects.

Contribution

It introduces a novel amplitude-level exponentiation method for both initial and final state photon radiation in hadron collisions.

Findings

Multi-photon radiation significantly impacts W-mass analysis cuts.

Preliminary comparisons show electroweak correction differences between KKMC-hh and HORACE.

Abstract

KKMC-hh is a precision event-generator for Z production and decay in hadronic collisions, which applies amplitude-level exponentiation to both initial and final state photon radiation, including perturbative residuals through order $\alpha^2 L$, together with electroweak matrix element corrections. We present results showing the effect of multi-photon radiation for cuts motivated by a recent ATLAS W-mass analysis. We also show preliminary untuned comparisons of the electroweak corrections of KKMC-hh to those of HORACE, which includes order $\alpha$ corrections with exponentiated final-state photon radiation.