$k_t$-factorization vs collinear factorization in $W^{+}W^{-}$ pair production at the LHC

TL;DR

This paper compares $k_t$-factorization and collinear factorization approaches for $W^{+}W^{-}$ pair production at the LHC, showing their predictions align with experimental data and exploring implications for new physics beyond the Standard Model.

Contribution

It provides a detailed comparison of $k_t$-factorization and collinear factorization predictions for $W^{+}W^{-}$ production, including the loop-induced channel relevant for new physics searches.

Findings

Predictions agree with ATLAS and CMS data.

Both approaches yield consistent results for $W^{+}W^{-}$ production.

The loop-induced channel is significant for beyond Standard Model studies.

Abstract

In this paper, we calculate the inclusive rate of $W^{+} W^{-}$ pair production through leptonic decay channels $W^+W^- \to l^+\nu_l + l^{\prime -} \nu_{l'}$ in the $k_t$-factorization framework. We also consider the exclusive $W^{+} W^{-}$ pair production through the one-loop induced $gg \to H \to W^+W^-$ channel that is important for the study of new physics beyond the Standard Model. The results are compared with predictions from the Herwig 7 event generator in the collinear factorization framework and with the experimental data from the ATLAS and the CMS collaborations. It will be shown that our predictions for the $W^+W^-$ boson pair production signals are in agreement with the experimental data as well as the collinear results.