Impact of A0 data on the Higgs boson production cross section at the LHC

TL;DR

This paper proposes a method to enhance the precision of Higgs boson production cross section predictions at the LHC by utilizing lepton angular distribution measurements to better constrain gluon PDFs, significantly reducing systematic uncertainties.

Contribution

It introduces a novel approach to use lepton angular coefficients from Z-boson decays to constrain gluon PDFs and improve Higgs cross section predictions at the LHC.

Findings

High-statistics measurements at LHC Run 3 and HL-LHC can reduce PDF uncertainties by 50%.

Using angular coefficients improves the accuracy of Higgs cross section estimates.

The method is implemented with the xFitter framework.

Abstract

In this talk, we present a way to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC using the measurements of lepton angular distributions. In this regards, we exploit the sensitivity of the lepton angular coefficient associated with the longitudinal Z-boson polarization to the parton density function (PDF) for gluons resolved from the incoming protons, in order to constrain the Higgs boson cross section from gluon fusion processes. We find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run 3 and high-luminosity HL-LHC improve the PDF systematics of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities. This study has been conducted using the open-source fitting framework xFitter. This talk refers to the following paper: arXiv:2012.10298[hep-ph]