A framework for simultaneous fit of QCD and BSM parameters with xFitter

Jun Gao; Katerina Lipka; Oleksandr Zenaiev; Simone Amoroso; Xiaomin Shen

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A framework for simultaneous fit of QCD and BSM parameters with xFitter

XiaoMin Shen, Simone Amoroso, Jun Gao, Katerina Lipka, Oleksandr Zenaiev

High Energy Physics - Phenomenology · Submitted 22 Jul 2024

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

The authors' main claim The importance of considering all the correlations of the parton distributions, top quark mass and the EFT parameters in a simultaneous QCD+SMEFT analysis is demonstrated.

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arXiv ID2407.16061 (version 2)

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CitationJun Gao, Katerina Lipka, Oleksandr Zenaiev, Simone Amoroso, Xiaomin Shen. "A framework for simultaneous fit of QCD and BSM parameters with xFitter." arXiv:2407.16061 (2024). https://pith.science/paper/LS6Q4GLA

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An extension of the xFitter open-source program for QCD analyses is presented, allowing for a polynomial parameterization of the dependence of physical observables on theoretical parameters. This extension enables simultaneous determination of parton distribution functions (PDFs) and new physics parameters within the framework of the Standard Model Effective Field Theory (SMEFT). The functionalities of the code are illustrated in a sensitivity study, where a simultaneous determination of the PDFs, top quark mass and the couplings of selected dimension-6 SMEFT operators is addressed using projections for measurements of top quark-antiquark pair production at the High-Luminosity LHC. The importance of considering all the correlations of the parton distributions, top quark mass and the EFT parameters in a simultaneous QCD+SMEFT analysis is demonstrated. This work serves as a new platform for simultaneous extraction of the PDFs and the SM/SMEFT parameters based on xFitter.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	An extension of the xFitter open-source program for QCD analyses is presented, allowing for a polynomial parameterization of the dependence of physical observables on theoretical parameters.	contribution 0.94	0.88	0.09	asserted 1.00
s1	This extension enables simultaneous determination of parton distribution functions (PDFs) and new physics parameters within the framework of the Standard Model Effective Field Theory (SMEFT).	contribution 0.84	0.68	0.25	asserted 0.98
s2	The functionalities of the code are illustrated in a sensitivity study, where a simultaneous determination of the PDFs, top quark mass and the couplings of selected dimension-6 SMEFT operators is addressed using projections for measurements of top quark-antiquark pair production at the High-Luminosity LHC.	contribution 0.74	0.88	0.13	asserted 0.98
s3	The importance of considering all the correlations of the parton distributions, top quark mass and the EFT parameters in a simultaneous QCD+SMEFT analysis is demonstrated.	interpretation 0.61	0.86	0.49	asserted 1.00
s4	This work serves as a new platform for simultaneous extraction of the PDFs and the SM/SMEFT parameters based on xFitter.	contribution 0.78	0.74	0.40	asserted 1.00

What kind of paper the classifier reports this is: method or tool 1.00 · evidence from simulation or computation 0.99.

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Original abstract

An extension of the xFitter open-source program for QCD analyses is presented, allowing for a polynomial parameterization of the dependence of physical observables on theoretical parameters. This extension enables simultaneous determination of parton distribution functions (PDFs) and new physics parameters within the framework of the Standard Model Effective Field Theory (SMEFT). The functionalities of the code are illustrated in a sensitivity study, where a simultaneous determination of the PDFs, top quark mass and the couplings of selected dimension-6 SMEFT operators is addressed using projections for measurements of top quark-antiquark pair production at the High-Luminosity LHC. The importance of considering all the correlations of the parton distributions, top quark mass and the EFT parameters in a simultaneous QCD+SMEFT analysis is demonstrated. This work serves as a new platform for simultaneous extraction of the PDFs and the SM/SMEFT parameters based on xFitter.

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References

Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Semiparametric Estimation of Physics Parameters and Parton Distribution Functions
hep-ph 2026-11 conditional novelty 8.0 of 10

A one-step debiased estimator based on semiparametric theory simultaneously determines SM/BSM parameters and PDFs without requiring a full joint fit.
Simultaneous extraction of top quark mass, strong coupling, effective mixing angle, and proton PDFs using inclusive DIS and proton-proton collision data
hep-ph 2026-07 conditional novelty 6.0 of 10

A single xFitter global fit extracts PDFs, alpha_s(mZ), top pole mass, and sin^2 theta_eff simultaneously at NNLO, with NLO NRQCD threshold corrections, yielding m_t=172.59 GeV, alpha_s=0.1179, sin^2 theta_eff=0.23142.
Tailored PDFs for New Physics searches
hep-ph 2026-02 conditional novelty 6.0 of 10

Using closure tests with W', Z', and coloron models, the paper shows that either excluding high-energy data or fitting PDFs jointly with SMEFT coefficients prevents new-physics signals from being absorbed into the pro...
Anomalous electroweak physics unraveled via evidential deep learning
hep-ph 2024-12 conditional novelty 5.0 of 10

A proof-of-principle demonstration that evidential deep learning can classify and quantify uncertainty for three toy anomalous electroweak scenarios in neutrino deep-inelastic scattering.

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3 arXiv papers cite this in 8 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 4 sentences without a confident label

Uses its method or tool 1 paper

For $m_t^pole$, the module [ref] of is used, which linearly interpolates the cross-section as function of $m_t$ in the region of interest, [equation] where $σ_δm_t$ is the linear coefficient.

Simultaneous extraction of top quark mass, strong coupling, effective mixing angle, and proton PDFs using inclusive DIS and proton-proton collision data · Extraction of the SM parameters · 1.00

Compares with it 1 paper

In the QCD+SMEFT version of the fit, the Wilson coefficients $c_tG/Λ^2=0.08±0.08$ TeV$^-2$ and $c_tq^(8)/Λ^2=-0.4±1.4$ TeV$^-2$ are obtained, consistent with the results of Ref. [ref] and the SM.

Simultaneous extraction of top quark mass, strong coupling, effective mixing angle, and proton PDFs using inclusive DIS and proton-proton collision data · Results · 1.00

Cites it as background 1 paper

In recent years, such an interplay between PDFs and NP has been extensively investigated [ref] .

Tailored PDFs for New Physics searches · Introduction · 0.95

What it cites · 53 sentences without a confident label

Uses the method or tool of 17 papers

The EFT corrections are calculated at NLO in QCD using Madgraph5_aMC@NLO [ref] together with the SMEFT@NLO [ref] model,

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations · Calculations of the theoretical predictions · 1.00
The EFT corrections are calculated at NLO in QCD using Madgraph5_aMC@NLO [ref] together with the SMEFT@NLO [ref] model,

Automated one-loop computations in the SMEFT · Calculations of the theoretical predictions · 1.00
The theoretical predictions for $tt̅$ production in SM are calculated at NNLO in QCD using MATRIX [ref] interfaced to [ref] .

Top-quark pair production at the LHC: Fully differential QCD predictions at NNLO · Calculations of the theoretical predictions · 1.00

Uses data or values from 2 papers

In the present work, the combined HERA inclusive DIS cross sections [ref] are used together with a projection for a future HL-LHC measurement of $tt̅$ production as a function of $$.

Combination of Measurements of Inclusive Deep Inelastic $e^{\pm}p$ Scattering Cross Sections and QCD Analysis of HERA Data · The datasets · 1.00
The statistical uncertainties of Ref. [ref] are scaled to their expectation values assuming an integrated luminosity of 3 ab$^-1$.

Measurement of differential $\text{t}\overline{\text{t}}$ production cross sections in the full kinematic range using lepton+jets events from proton-proton collisions at $\sqrt{s} = $ 13 TeV · The datasets · 0.87

Compares with 2 papers

The advantage of this work with respect to earlier studies, e.g. those of Ref. [ref] , is that the EFT corrections are stored in fast grids, which incorporate the full PDF dependence and accurate quadratic EFT corrections.

Parton distributions in the SMEFT from high-energy Drell-Yan tails · Introduction · 0.90
Again, only the Hessian fit uncertainty is considered, which is compatible to the current uncertainty in $$ obtained in direct measurements at the LHC, e.g. the one of Ref. [ref] .

Combination of measurements of the top quark mass from data collected by the ATLAS and CMS experiments at $\sqrt{s}$ = 7 and 8 TeV · SM scenario for pseudo-data · 0.97

Cites as background 13 papers

Recently, automated tools have been developed for calculations of NLO QCD corrections to arbitrary hard processes including the contribution of all dimension-6 SMEFT operators [ref] .

Automated one-loop computations in the SMEFT · Framework on simultaneous fit of QCD and BSM · 0.93
These interpretations of the LHC data rely on a detailed knowledge of the proton structure, described in terms of Parton Distribution Functions (PDFs) [ref] .

The Structure of the Proton in the LHC Precision Era · Introduction · 1.00
The Standard Model Effective Field Theory (SMEFT) [ref] provides a systematic framework for incorporating these higher-energy effects into low-energy theories, allowing for investigations of new physics phenomena in a controlled and organized approach.

The Standard Model as an Effective Field Theory · Introduction · 1.00

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