Lepton-Charge and Forward-Backward Asymmetries in Drell-Yan Processes for Precision Electroweak Measurements and New Physics Searches

Francesco Giuli; Francesco Hautmann; Juri Fiaschi; Stefano Moretti

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Lepton-Charge and Forward-Backward Asymmetries in Drell-Yan Processes for Precision Electroweak Measurements and New Physics Searches

Juri Fiaschi, Francesco Giuli, Francesco Hautmann, Stefano Moretti

High Energy Physics - Phenomenology · Submitted 18 Mar 2021

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

The authors' main claim We discuss the complementarity of the asymmetries in reducing PDF uncertainties in observables relevant to both SM and Beyond the SM (BSM) physics.

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arXiv ID2103.10224 (version 3)

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CitationFrancesco Giuli, Francesco Hautmann, Juri Fiaschi, Stefano Moretti. "Lepton-Charge and Forward-Backward Asymmetries in Drell-Yan Processes for Precision Electroweak Measurements and New Physics Searches." arXiv:2103.10224 (2021). https://pith.science/paper/OCJVH7FT

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Precision determinations of Standard Model (SM) Electro-Weak (EW) parameters at the Large Hadron Collider (LHC) are dominated by uncertainties due to Parton Distribution Functions (PDFs). Reweighting and profiling techniques are routinely employed to treat this. We explore approaches based on combining measurements of charged current and neutral current Drell-Yan (DY) asymmetries to improve PDF uncertainties. We present the results of a numerical analysis performed with the open-source platform xFitter. PDF uncertainties are examined for lepton-charge and forward-backward asymmetries in regions of transverse and invariant masses near the vector-boson peak, based on LHC Run III and HL-LHC luminosity scenarios. We discuss the complementarity of the asymmetries in reducing PDF uncertainties in observables relevant to both SM and Beyond the SM (BSM) physics.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Precision determinations of Standard Model (SM) Electro-Weak (EW) parameters at the Large Hadron Collider (LHC) are dominated by uncertainties due to Parton Distribution Functions (PDFs).	background 1.00	0.08	0.04	asserted 1.00
s1	Reweighting and profiling techniques are routinely employed to treat this.	background 0.98	0.06	0.03	asserted 1.00
s2	We explore approaches based on combining measurements of charged current and neutral current Drell-Yan (DY) asymmetries to improve PDF uncertainties.	contribution 0.88	0.45	0.14	asserted 0.55
s3	We present the results of a numerical analysis performed with the open-source platform xFitter.	method 0.82	0.88	0.03	asserted 0.99
s4	PDF uncertainties are examined for lepton-charge and forward-backward asymmetries in regions of transverse and invariant masses near the vector-boson peak, based on LHC Run III and HL-LHC luminosity scenarios.	contribution 0.72	0.83	0.13	asserted 0.93
s5	We discuss the complementarity of the asymmetries in reducing PDF uncertainties in observables relevant to both SM and Beyond the SM (BSM) physics.	interpretation 0.90	0.59	0.45	asserted 0.60

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Original abstract

Precision determinations of Standard Model (SM) Electro-Weak (EW) parameters at the Large Hadron Collider (LHC) are dominated by uncertainties due to Parton Distribution Functions (PDFs). Reweighting and profiling techniques are routinely employed to treat this. We explore approaches based on combining measurements of charged current and neutral current Drell-Yan (DY) asymmetries to improve PDF uncertainties. We present the results of a numerical analysis performed with the open-source platform xFitter. PDF uncertainties are examined for lepton-charge and forward-backward asymmetries in regions of transverse and invariant masses near the vector-boson peak, based on LHC Run III and HL-LHC luminosity scenarios. We discuss the complementarity of the asymmetries in reducing PDF uncertainties in observables relevant to both SM and Beyond the SM (BSM) physics.

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11 arXiv papers cite this in 34 sentences

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Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 1 paper

We address the impact of future measurements of charged and neutral current Drell-Yan (DY) asymmetries and their combination on Parton Distribution Functions (PDFs) uncertainties.

Complementarity of Lepton-Charge and Forward-Backward Drell-Yan Asymmetries for Precision Electroweak Measurements and Quark Density Determinations · 0.92

Papers citing it · 27 sentences without a confident label

Uses its method or tool 2 papers

The results of this paper are obtained using the “improved PDFs" constructed according to the approach illustrated in Ref. [ref] .

Enhancing the Large Hadron Collider Sensitivity to Charged and Neutral Broad Resonances of New Gauge Sectors · PDF Profiling · 0.93
The implementation of $A_W$ as a function of the pseudorapidity of the charged lepton ($η_ℓ$) has been similarly conducted [ref] , with the inclusion of the fiducial cuts reported in Ref. [ref] , using fixed-order (FO) next-to leading order (NLO) predictions computed with [ref] as well as next-to-next-to leading order (NNLO) QCD $k$-factors obtained from [ref] .

Impact of charged and neutral Drell-Yan Asymmetries on precision measurements · $𝐀_𝐅𝐁$ and $𝐀_𝐖$ complementarity · 0.96

Cites it as support 3 papers

The strong interference effects between the BSM resonances themselves and between the BSM and SM states are responsible for the presence of a statistically significant depletion of events that appears below the BW (Jacobian) peaks in the invariant (transverse) mass distribution in the NC (CC) process [ref] .

Enhancing the Large Hadron Collider Sensitivity to Charged and Neutral Broad Resonances of New Gauge Sectors · Introduction · 0.96
We will also be looking at the asymmetries of the final states, as the latter observables have already been proven to aid a potential discovery of wide $W^'$ and $Z^'$ states [ref] .

Cross-fertilising extra gauge boson searches at the LHC · Introduction · 0.98
Given that parton distribution functions (PDFs) constitute one of the dominant uncertainty sources in the precision EW physics program at the LHC, it is especially relevant that the $A_FB$ asymmetry has been shown to provide us with new sensitivity to PDFs [ref] .

Exploring SMEFT Couplings Using the Forward-Backward Asymmetry in Neutral Current Drell-Yan Production at the LHC · Introduction · 0.99

What it cites · 30 sentences without a confident label

Builds on 2 papers

Extending the study of Ref. [ref] using $A_FB$, here, we have investigated the impact of combining $A_FB$ with the lepton-charge asymmetry $A_W$ and shown, by a quantitative analysis using xFitter, the complementary constraints provided by the two asymmetries.

PDF Profiling Using the Forward-Backward Asymmetry in Neutral Current Drell-Yan Production · Conclusions · 1.00
We introduce the enhanced Sequential SM (SSM) model as in Ref. [ref] , which follows the original SSM [ref] and features in its spectrum an extra $Z^'$ and a $W^'$ characterised by the same chiral couplings as the SM gauge bosons, but in this case the overall BSM gauge coupling is enhanced by a factor 3 with respect to the SM one.

Production of Z'-Boson Resonances with Large Width at the LHC · PDF uncertainties in dilepton observables · 0.80

Uses the method or tool of 10 papers

Following the method of Refs. [ref] , we apply the technique [ref] to evaluate PDF uncertainties.

Longitudinal Z-Boson Polarization and the Higgs Boson Production Cross Section at the Large Hadron Collider · Complementarity of $A_FB$ and $A_W$ · 1.00
Following the method of Refs. [ref] , we apply the technique [ref] to evaluate PDF uncertainties.

PDF reweighting in the Hessian matrix approach · Complementarity of $A_FB$ and $A_W$ · 1.00
Following the method of Refs. [ref] , we apply the technique [ref] to evaluate PDF uncertainties.

QCD analysis of $W$- and $Z$-boson production at Tevatron · Complementarity of $A_FB$ and $A_W$ · 1.00

Uses data or values from 4 papers

We will consider measurements of lepton-charge asymmetry at Runs I and II [ref] as well as future measurements at Run III and HL-LHC luminosities.

Measurements of the W boson rapidity, helicity, double-differential cross sections, and charge asymmetry in pp collisions at $\sqrt{s} =$ 13 TeV · Introduction · 0.80
We will consider measurements of lepton-charge asymmetry at Runs I and II [ref] as well as future measurements at Run III and HL-LHC luminosities.

Measurement of the cross-section and charge asymmetry of $W$ bosons produced in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector · Introduction · 0.80
The left (right) plot shows the comparison of the uncertainties in the electron (muon) plus missing transverse energy channel, for which a resolution of about 1.3% (8%) and an efficiency of about 64% (44%) have been assumed, in order to resemble, e.g., the ATLAS experiment features declared in Ref. [ref] .

Search for a heavy charged boson in events with a charged lepton and missing transverse momentum from $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector · Effects on $W^'$ searches · 0.88

Compares with 2 papers

In Fig. [ref] we compare the improved PDF uncertainties, after profiling based on the combination of $A_FB$ and $A_W$ asymmetries, with the recent SeaQuest/E906 results [ref] , wherein it was shown that the ratio of the PDFs of $d̅$ and $u̅$ states as a function of $x$ is notably different from both the QCD expectation of it being nearly 1 [ref] and the predictions of several proposed mechanisms (e.g., Pauli blocking, statistical models, chiral solitons and meson-baryon dynamics) that had been disfavoured by similar previous results from NuSea/E866 [ref] .

The Asymmetry of Antimatter in the Proton · Antimatter asymmetry in the proton · 0.97
In Fig. [ref] we compare the improved PDF uncertainties, after profiling based on the combination of $A_FB$ and $A_W$ asymmetries, with the recent SeaQuest/E906 results [ref] , wherein it was shown that the ratio of the PDFs of $d̅$ and $u̅$ states as a function of $x$ is notably different from both the QCD expectation of it being nearly 1 [ref] and the predictions of several proposed mechanisms (e.g., Pauli blocking, statistical models, chiral solitons and meson-baryon dynamics) that had been disfavoured by similar previous results from NuSea/E866 [ref] .

Improved Measurement of the $\bar d / \bar u$ Asymmetry in the Nucleon Sea · Antimatter asymmetry in the proton · 0.97

Cites as background 8 papers

Studies of the impact of $W$ and $Z$ production data on PDFs have recently appeared [ref] based on the ePump package [ref] .

Updating and Optimizing Error PDFs in the Hessian Approach · Introduction · 0.93
Studies of the impact of $W$ and $Z$ production data on PDFs have recently appeared [ref] based on the ePump package [ref] .

A New Method for Reducing PDF Uncertainties in the High-Mass Drell-Yan Spectrum · Introduction · 0.93
Studies of the impact of $W$ and $Z$ production data on PDFs have recently appeared [ref] based on the ePump package [ref] .

Updating and Optimizing Error PDFs in the Hessian Approach. Part II · Introduction · 0.93

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