Bhabha scattering at future colliders with BHLUMI/BHWIDE
Wiesław Płaczek, Maciej Skrzypek, Bennie F. L. Ward, Scott A. Yost
TL;DR
The paper addresses the need for sub-permil luminosity precision for small- and large-angle Bhabha scattering at future $e^+e^-$ colliders. It analyzes two MC generators, BHLUMI for SABS and BHWIDE for LABS, and outlines upgrade paths to include higher-order QED and EW corrections within a YFS exclusive exponentiation framework, namely $O(\alpha^3)$ prag for SABS and NNLO for LABS. The authors discuss interoperability with testing tools like LUMLOG, OLDBIS, BabaYaga, OpenLoops, Recola, and GRIFFIN to validate precision, and argue that collinearly-enhanced YFS resummation can further improve theoretical accuracy toward sub-permil luminosity at FCC-ee.
Abstract
In this paper, we briefly present the Monte Carlo event generators BHLUMI and BHWIDE for small and large angle Bhabha scattering, respectively, and discuss possible ways of their improvements in order to satisfy precision needs of future electron-positron colliders.