Precision QEDXQCD Resummation Theory for LHC Physics: Status and Update

TL;DR

This paper introduces an IR-improved DGLAP-CS theory for precision LHC calculations, demonstrating its implementation in Monte Carlo simulations with HERWIG6.5, showing improved modeling of energy fractions and transverse momentum distributions.

Contribution

It develops a new IR-improved resummation scheme for QED and QCD corrections, integrating it into Monte Carlo event generators for enhanced accuracy in LHC physics.

Findings

IR-improved showers populate lower energy fractions and p_T values.

First MC data comparing IR-improved and standard showers.

Potential phenomenological implications discussed.

Abstract

We present the elements of the IR-improved DGLAP-CS theory as it relates to the new MC friendly exponentiated scheme for precision calculation of higher order corrections to LHC physics in which IR singularities from both QED and QCD are canceled to all orders in alpha and in alpha_s simultaneously in the presence of rigorous shower/ME matching. We present the first MC data comparing the implied new showers themselves with the standard ones using the HERWIG6.5 MC event generator as a test case at LHC energies. As expected, the IR-improved shower re-populates lower values of the energy fraction z and lower values of the attendant p_T for the standard HERWIG6.5 input parameters. Possible phenomenological implications are discussed.