Longitudinal Z-Boson Polarization and the Higgs Boson Production Cross Section at the Large Hadron Collider

A. Glazov; F. Giuli; F. Hautmann; J. Fiaschi; O. Zenaiev; S. Amoroso

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Longitudinal Z-Boson Polarization and the Higgs Boson Production Cross Section at the Large Hadron Collider

S. Amoroso, J. Fiaschi, F. Giuli, A. Glazov, F. Hautmann, O. Zenaiev

High Energy Physics - Phenomenology · Submitted 18 Dec 2020

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim By a detailed numerical analysis using the open-source platform xFitter, we find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run III and high-luminosity HL-LHC improve the PDF systematic uncertainties of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities.

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arXiv ID2012.10298 (version 2)

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CitationA. Glazov, F. Giuli, F. Hautmann, J. Fiaschi, O. Zenaiev, S. Amoroso. "Longitudinal Z-Boson Polarization and the Higgs Boson Production Cross Section at the Large Hadron Collider." arXiv:2012.10298 (2020). https://pith.science/paper/T6UFEKEY

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Charged lepton pairs are produced copiously in high-energy hadron collisions via electroweak gauge boson exchange, and are one of the most precisely measured final states in proton-proton collisions at the Large Hadron Collider (LHC). We propose that measurements of lepton angular distributions can be used to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC. To this end, 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. By a detailed numerical analysis using the open-source platform xFitter, we find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run III and high-luminosity HL-LHC improve the PDF systematic uncertainties of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Charged lepton pairs are produced copiously in high-energy hadron collisions via electroweak gauge boson exchange, and are one of the most precisely measured final states in proton-proton collisions at the Large Hadron Collider (LHC).	background 1.00	0.06	0.02	asserted 1.00
s1	We propose that measurements of lepton angular distributions can be used to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC.	contribution 0.91	0.32	0.24	hedged possibility 0.68
s2	To this end, 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.	method 0.81	0.36	0.10	asserted 0.96
s3	By a detailed numerical analysis using the open-source platform xFitter, we find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run III and high-luminosity HL-LHC improve the PDF systematic uncertainties of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities.	result 1.00	0.94	0.84	asserted 1.00

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Original abstract

Charged lepton pairs are produced copiously in high-energy hadron collisions via electroweak gauge boson exchange, and are one of the most precisely measured final states in proton-proton collisions at the Large Hadron Collider (LHC). We propose that measurements of lepton angular distributions can be used to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC. To this end, 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. By a detailed numerical analysis using the open-source platform xFitter, we find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run III and high-luminosity HL-LHC improve the PDF systematic uncertainties of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities.

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8 arXiv papers cite this in 12 sentences

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States the same result 2 papers

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.

Impact of A0 data on the Higgs boson production cross section at the LHC · 1.00
Through a detailed numerical analysis using the open-source xFitter platform, we illustrate how this observable can provide significant sensitivity over current determinations of the gluon PDF, and a reduction in the PDF uncertainty on the Higgs boson production cross-section by a factor of over 50\%.

Longitudinal Z-boson polarization and the Higgs boson production cross-section · 0.99

Papers citing it · 9 sentences without a confident label

Uses its method or tool 3 papers

This is based on the following: i) exploiting DY production for NC and CC channels in the mass region near the SM vector boson peak, characterised by high statistics; ii) using the information encoded in the DY asymmetries of the NC [ref] and CC channels, associated with the SM vector boson left-handed and right-handed polarizations, to reduce quark PDF uncertainties.[The vector boson longitudinal polarization can be used to constrain gluon distributions in gluon fusion processes, see [ref] .]

Enhancing the Large Hadron Collider Sensitivity to Charged and Neutral Broad Resonances of New Gauge Sectors · PDF Profiling · 0.93
Following the method of Refs. [ref] , we apply the technique [ref] to evaluate PDF uncertainties.

Lepton-Charge and Forward-Backward Asymmetries in Drell-Yan Processes for Precision Electroweak Measurements and New Physics Searches · Complementarity of $A_FB$ and $A_W$ · 1.00
In Fig. [ref] [ref] we perform a higher-order N$^3$LO calculation for the Higgs boson total cross section using the code ggHiggs [ref] .

xFitter: An Open Source QCD Analysis Framework. A resource and reference document for the Snowmass study · Higgs Physics with xFitter · 0.99

What it cites · 55 sentences without a confident label

Uses the method or tool of 6 papers

To analyze the impact of high-precision $A_0$ measurements on the Higgs boson production cross section, we implement the NLO MadGraph5_aMC@NLO $A_0$ calculation into the fit platform xFitter [ref] .

HERAFitter, Open Source QCD Fit Project · Introduction · 1.00
To study this, we compute SM Higgs boson production in the gluon fusion mode for $√(s)=13$ TeV $pp$ collisions, using the MCFM code [ref] at NLO in QCD perturbation theory.

Precision phenomenology with MCFM · Introduction · 1.00
To study this, we compute SM Higgs boson production in the gluon fusion mode for $√(s)=13$ TeV $pp$ collisions, using the MCFM code [ref] at NLO in QCD perturbation theory.

MCFM for the Tevatron and the LHC · Introduction · 1.00

Uses data or values from 2 papers

To validate our theoretical framework based on the implementation of the NLO MadGraph5_aMC@NLO $A_0$ calculation into the fit platform xFitter, we consider the $√(s) = 8$ TeV ATLAS measurements [ref] for the angular coefficient $A_0$, using the unregularised data in the three rapidity regions and removing the bins with $p_T<11.4$ GeV.

Measurement of the angular coefficients in $Z$-boson events using electron and muon pairs from data taken at $\sqrt{s}=8$ TeV with the ATLAS detector · Fit to ATLAS 8 TeV data · 0.99
See e.g. [ref] , where the PDF contribution is estimated to be about 30 $%$ of the total uncertainty, including $α_s$ and scale variations.

Higgs Physics at the HL-LHC and HE-LHC · Introduction · 0.87

Cites as background 15 papers

Gluon PDF determinations are considered from open [ref] and bound-state [ref] charm and bottom quark production, light-quark jets [ref] and top quark production [ref] .

Gluon PDF constraints from the ratio of forward heavy quark production at the LHC at \sqrt{S}=7 and 13 TeV · Introduction · 0.91
Gluon PDF determinations are considered from open [ref] and bound-state [ref] charm and bottom quark production, light-quark jets [ref] and top quark production [ref] .

How to include exclusive $J/\psi$ production data in global PDF analyses · Introduction · 0.91
Gluon PDF determinations are considered from open [ref] and bound-state [ref] charm and bottom quark production, light-quark jets [ref] and top quark production [ref] .

Improved constraints on parton distributions using LHCb, ALICE and HERA heavy-flavour measurements and implications for the predictions for prompt atmospheric-neutrino fluxes · Introduction · 0.91

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