Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

A Double Parton Scattering Background to Associate $WH$ and $ZH$ Production at the LHC

M. Y. Hussein

TL;DR

The paper assesses Higgs production in association with W or Z bosons at the LHC and emphasizes the $H\rightarrow b\bar{b}$ decay channel for $m_H$ below about 135 GeV. It introduces the double parton scattering mechanism as a potential background, derives the factorized cross-section $\sigma_{DS} = \frac{\sigma^a\sigma^b}{\sigma_{eff}}$ with $\sigma_{eff}$ from CDF measurements, and discusses the role of parton correlations encoded in $\Gamma(x_1,x_2;\hat{b})$. Cross-section computations show that the DP background can be three orders of magnitude larger than the signal in the relevant channels, highlighting a substantial background in high-luminosity LHC data. The study underscores the need to accurately model DP backgrounds and notes uncertainties from small-$x$ PDFs and higher-order QCD corrections.

Abstract

Higgs boson production in association with $W$ and $Z$ bosons at high luminosity CERN Large Hadron Collider (LHC,$\sqrt{s}$=14 TeV), is one of the most promising discovery channel for a SM Higgs particle with a mass below 135 GeV, where the Higgs decays into $b\bar{b}$ final states is dominant. The experimental capability of recognizing the presence of $b$ quarks in a complex hadronic final state has brought attention towards the final states with pairs for observing the production of the Higgs at the LHC. We point out that double parton scattering processes are going to represent a sizable background to the process.

A Double Parton Scattering Background to Associate $WH$ and $ZH$ Production at the LHC

TL;DR

The paper assesses Higgs production in association with W or Z bosons at the LHC and emphasizes the decay channel for below about 135 GeV. It introduces the double parton scattering mechanism as a potential background, derives the factorized cross-section with from CDF measurements, and discusses the role of parton correlations encoded in . Cross-section computations show that the DP background can be three orders of magnitude larger than the signal in the relevant channels, highlighting a substantial background in high-luminosity LHC data. The study underscores the need to accurately model DP backgrounds and notes uncertainties from small- PDFs and higher-order QCD corrections.

Abstract

Higgs boson production in association with and bosons at high luminosity CERN Large Hadron Collider (LHC,=14 TeV), is one of the most promising discovery channel for a SM Higgs particle with a mass below 135 GeV, where the Higgs decays into final states is dominant. The experimental capability of recognizing the presence of quarks in a complex hadronic final state has brought attention towards the final states with pairs for observing the production of the Higgs at the LHC. We point out that double parton scattering processes are going to represent a sizable background to the process.

Paper Structure

This paper contains 4 sections, 6 equations, 3 figures, 1 table.

Table of Contents

  1. INTRODUCTION
  2. DOUBLE PARTON SCATTERING MECHANISM
  3. CROSS-SECTION RESULTS
  4. SUMMARY

Figures (3)

  • Figure 1: Branching ratios of the SM Higgs boson in the mass range for the decay modes $b\bar{b},\, \tau^+\tau^-,\, c\bar{c},\, gg.$
  • Figure 2: Total cross section for $WH$ and $ZH$ production at the LHC times the branching ratios of the decay modes, as function of Higgs mass.
  • Figure 3: Double parton scattering background to the Higgs boson production as a function of the $b\bar{b}$ invariant mass compared to the expected Higgs signal for three possible values of the Higgs mass 80, 100 and 120 GeV.