WINHAC - the Monte Carlo event generator for single W-boson production in hadronic collisions

TL;DR

WINHAC is a Monte Carlo event generator designed for single W-boson production in hadronic collisions, incorporating electroweak corrections, photon radiation, and interfacing with PYTHIA, validated against other programs for precision studies.

Contribution

It introduces a comprehensive Monte Carlo generator for W-boson production with advanced features like multiphoton radiation and polarization, validated at high precision.

Findings

Achieved sub-permil agreement with other Monte Carlo programs

Successfully incorporated electroweak corrections and photon radiation

Validated for various collision types and polarization states

Abstract

We present the Monte Carlo event generator WINHAC for the charged-current Drell-Yan process, i.e. single W-boson production with leptonic decays in hadronic collisions. It features multiphoton radiationwithin the Yennie-Frautschi-Suura exclusive exponentiation scheme with O(alpha) electroweak corrections. For the initial-state QCD/QED parton shower and hadronisation it is interfaced directly to PYTHIA. It implements the options for proton-proton, proton-antipronton and any nucleus-nucleus collisions. Moreover, it includes the polarized W-boson production and the neutral current Drell-Yan process, both at the Born level. Generation of weighted as well as unweighted (weight=1) events is possible. WINHAC has been thoroughly tested numerically and cross-checked with independent Monte Carlo programs, such as HORACE and SANC; in the so-called tuned comparisons, an agreement at the sub-permil-level has been reached. It has also been used as a basic tool for developing and testing some new measurement methods of the Standard Model parameters at the LHC.