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Linearly polarized Gluons and the Higgs Transverse Momentum Distribution

Wilco J. den Dunnen, Daniel Boer, Cristian Pisano, Marc Schlegel, Werner Vogelsang

TL;DR

This work studies how gluons carrying linear polarization inside an unpolarized hadron contribute to the transverse momentum distribution of Higgs bosons produced in hadronic collisions.

Abstract

We investigate the possible role of linearly polarized gluons in Higgs production from unpolarized pp collisions. The transverse momentum distribution of the produced Higgs boson is found to exhibit a modulation with respect to the naive, unpolarized expectation, with the sign depending on the parity of the Higgs boson. The transverse momentum distribution of a scalar Higgs will, therefore, have a shape clearly different from a pseudoscalar Higgs. We suggest that this effect can be used to determine the parity of the Higgs at the LHC, without the need to use challenging angular distributions.

Linearly polarized Gluons and the Higgs Transverse Momentum Distribution

TL;DR

This work studies how gluons carrying linear polarization inside an unpolarized hadron contribute to the transverse momentum distribution of Higgs bosons produced in hadronic collisions.

Abstract

We investigate the possible role of linearly polarized gluons in Higgs production from unpolarized pp collisions. The transverse momentum distribution of the produced Higgs boson is found to exhibit a modulation with respect to the naive, unpolarized expectation, with the sign depending on the parity of the Higgs boson. The transverse momentum distribution of a scalar Higgs will, therefore, have a shape clearly different from a pseudoscalar Higgs. We suggest that this effect can be used to determine the parity of the Higgs at the LHC, without the need to use challenging angular distributions.

Paper Structure

This paper contains 6 sections, 8 equations, 2 figures.

Table of Contents

  1. Introduction
  2. TMD factorization
  3. Size of the linearly polarized gluon distribution
  4. Higgs transverse momentum distribution
  5. Two photon decay channel
  6. Conclusions

Figures (2)

  • Figure 1: Transverse momentum distribution of the Higgs, using the parameterization of $h_1^{\perp g}$ in Eq. \ref{['eq:h1ppar']} with $r=2/3$ (left) and $r=1/3$ (right). The naive curve is the prediction for both scalar and pseudoscalar in case $h_1^{\perp g}=0$.
  • Figure 2: The ratio $F_2/F_1$ in Eq. \ref{['eq:qTgammagamma']} plotted as function of $Q$ for $\theta=\pi/2$ assuming a $120$ GeV Higgs (left) and the same curves including a detector resolution of 0.5 and 1 GeV (right).