Differential cross section for the Higgs boson production in 4-lepton channel and $k_T$-factorization

TL;DR

This paper investigates the differential cross section for Higgs boson production in the 4-lepton channel using the $k_T$-factorization approach, comparing theoretical predictions with experimental data from ATLAS and CMS.

Contribution

It introduces a $k_T$-factorization calculation for Higgs production using CCFM uPDFs and compares results with fixed-order collinear predictions and measurements.

Findings

Good agreement with ATLAS and CMS data

Highlights differences between $k_T$-factorization and collinear approaches

Provides insights into Higgs production mechanisms

Abstract

We present our study of the differential cross section for the Higgs boson production in $k_T$-factorization framework. The $k_T$-factorization formalism includes a convolution over unintegrated parton distribution functions (uPDF) and off-shell parton level matrix element. The off-shell matrix element calculated considering initial gluons to be off-shell. We have considered only gluon fusion process which is dominant production mechanism for the Higgs boson production at LHC. We have used Ciafaloni-Catani-Fiorani-Marchesini (CCFM) uPDF based on CCFM evolution equations. We have compared our results with fixed order estimates up to NNLO+NNLL obtained using HRes tool within collinear factorization framework as well as with the ATLAS and CMS measurements of the corresponding differential distributions. This study will play an important role in understanding differential cross section within $k_T$-factorization framework.