T. Cridge
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View article: Theory uncertainties in the extraction of αs from Drell-Yan at small transverse momentum
Theory uncertainties in the extraction of αs from Drell-Yan at small transverse momentum Open
A bstract We perform a detailed pseudodata study to estimate the expected theory uncertainty in the extraction of the strong coupling constant, α s ( m Z ), from a fit to the measured Drell-Yan transverse momentum ( q T ) spectrum at small…
View article: A reassessment of the role of high $x$ data on the MSHT global PDF fit
A reassessment of the role of high $x$ data on the MSHT global PDF fit Open
We present updates within the MSHT global PDF fit that focus on the high $x$ region, and on improving our understanding of the interplay of various theoretical contributions and experimental constraints here. We revisit the question of tar…
View article: QED-enhanced PDF implications for the Higgs sector
QED-enhanced PDF implications for the Higgs sector Open
In this work, we examine the implications of electroweak corrections beyond leading order for processes of special interest in the Higgs sector. We especially explore the role of these corrections given the introduction of an explicit part…
View article: Combination of aN<sup>3</sup>LO PDFs and implications for Higgs production cross-sections at the LHC
Combination of aN<sup>3</sup>LO PDFs and implications for Higgs production cross-sections at the LHC Open
We discuss how the two existing approximate N 3 LO (aN 3 LO) sets of parton distributions (PDFs) from the MSHT20 and NNPDF4.0 series can be combined for LHC phenomenology, both in the pure QCD case and for the QCD ⨂ QED sets that include t…
View article: Combination of aN<sup>3</sup>LO PDFs and implications for Higgs production cross-sections at the LHC
Combination of aN<sup>3</sup>LO PDFs and implications for Higgs production cross-sections at the LHC Open
We discuss how the two existing approximate N 3 LO (aN 3 LO) sets of parton distributions (PDFs) from the MSHT20 and NNPDF4.0 series can be combined for LHC phenomenology, both in the pure QCD case and for the QCD ⨂ QED sets that include t…
View article: A stress test of global PDF fits: closure testing the MSHT PDFs and a first direct comparison to the neural net approach
A stress test of global PDF fits: closure testing the MSHT PDFs and a first direct comparison to the neural net approach Open
We present a first global closure test of the fixed parameterisation (MSHT) approach to PDF fitting. We find that the default MSHT20 parameterisation can reproduce the features of the input set in such a closure test to well within the tex…
View article: Theory Uncertainties in the Extraction of $\alpha_s$ from Drell-Yan at Small Transverse Momentum
Theory Uncertainties in the Extraction of $\alpha_s$ from Drell-Yan at Small Transverse Momentum Open
We perform a detailed pseudodata study to estimate the expected theory uncertainty in the extraction of the strong coupling constant, $α_s(m_Z)$, from a fit to the measured Drell-Yan transverse momentum ($q_T$) spectrum at small $q_T \ll m…
View article: The strong coupling constant: state of the art and the decade ahead
The strong coupling constant: state of the art and the decade ahead Open
Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The cu…
View article: Closure Testing the MSHT PDFs and a First Direct Comparison to the Neural Net Approach
Closure Testing the MSHT PDFs and a First Direct Comparison to the Neural Net Approach Open
We present a brief overview of the first global closure test of the fixed parameterisation (MSHT) approach to PDF fitting. We find that the default MSHT20 parameterisation can reproduce the features of the input set in such a closure test …
View article: MSHT Updates 2024
MSHT Updates 2024 Open
We present various recent updates related to the MSHT20 PDF sets, and particularly to the MSHT20 approximate N$^3$LO (aN$^3$LO) PDFs. These include an investigation of including either inclusive jet data or dijet data, the detailed treatme…
View article: Combining QED and approximate ${\rm N}^3$LO QCD corrections in a global PDF fit: MSHT20qed_an3lo PDFs
Combining QED and approximate ${\rm N}^3$LO QCD corrections in a global PDF fit: MSHT20qed_an3lo PDFs Open
We present the MSHT20qed_an3lo parton distribution functions (PDFs). These result from the first global PDF analysis to combine QED and approximate N^3 LO (a N^3 LO) QCD corrections in the theoretical calculation of the PDF evolution and c…
View article: A Benchmarking of QCD Evolution at Approximate $N^3LO$
A Benchmarking of QCD Evolution at Approximate $N^3LO$ Open
We present a detailed benchmarking of different treatments of the QCD evolution of unpolarized PDFs at approximate $N^3LO$ ($aN^3LO$) order in the QCD coupling. Namely, the implementations in the public $aN^3LO$ releases of the MSHT and NN…
View article: The impact of LHC jet and Z $$p_T$$ data at up to approximate N$${}^3$$LO order in the MSHT global PDF fit
The impact of LHC jet and Z $$p_T$$ data at up to approximate N$${}^3$$LO order in the MSHT global PDF fit Open
We present an analysis of two key sets of data constraining the high x gluon at up to approximate N $${}^3$$ LO in QCD within the MSHT global PDF fitting framework. We begin with LHC 7 and 8 TeV inclusive jet and dijet production at both N…
View article: A first determination of the strong coupling $α_S$ at approximate N$^{3}$LO order in a global PDF fit
A first determination of the strong coupling $α_S$ at approximate N$^{3}$LO order in a global PDF fit Open
We present the first determination of the value of the strong coupling via a simultaneous global fit of the proton parton distribution functions (PDFs) at approximate N$^{3}$LO (aN$^{3}$LO) order in QCD. This makes use of the MSHT global P…
View article: Impact of inclusive electron ion collider data on collinear parton distributions
Impact of inclusive electron ion collider data on collinear parton distributions Open
A study is presented of the impact of updated simulated inclusive electron ion collider deep inelastic scattering data on the determination of the proton and nuclear parton distribution functions (PDFs) at next-to-next-to-leading and next-…
View article: Combining QED and Approximate N${}^3$LO QCD Corrections in a Global PDF Fit: MSHT20qed_an3lo PDFs
Combining QED and Approximate N${}^3$LO QCD Corrections in a Global PDF Fit: MSHT20qed_an3lo PDFs Open
We present the MSHT20qed_an3lo parton distribution functions (PDFs). These result from the first global PDF analysis to combine QED and approximate N${}^3$LO (aN${}^3$LO) QCD corrections in the theoretical calculation of the PDF evolution …
View article: A Stress Test of Global PDF Fits: Closure Testing the MSHT PDFs and a First Direct Comparison to the Neural Net Approach
A Stress Test of Global PDF Fits: Closure Testing the MSHT PDFs and a First Direct Comparison to the Neural Net Approach Open
We present a first global closure test of the fixed parameterisation (MSHT) approach to PDF fitting. We find that the default MSHT20 parameterisation can reproduce the features of the input set in such a closure test to well within the tex…
View article: Constraining the top-quark mass within the global MSHT PDF fit
Constraining the top-quark mass within the global MSHT PDF fit Open
We examine the ability of experimental measurements of top-quark pair production to constrain both the top-quark mass and the strong coupling within the global MSHT parton distribution function (PDF) fit. Specifically, we consider ATLAS an…
View article: Quantifying the interplay of experimental constraints in analyses of parton distributions
Quantifying the interplay of experimental constraints in analyses of parton distributions Open
Parton distribution functions (PDFs) play a central role in calculations for the LHC. To gain a deeper understanding of the emergence and interplay of constraints on the PDFs in the global QCD analyses, it is important to examine the relat…
View article: Quantifying the interplay of experimental constraints in analyses of parton distributions
Quantifying the interplay of experimental constraints in analyses of parton distributions Open
Parton distribution functions (PDFs) play a central role in calculations for the Large Hadron Collider (LHC). To gain a deeper understanding of the emergence and interplay of constraints on the PDFs in the global QCD analyses, it is import…
View article: Impact of Inclusive Electron Ion Collider Data on Collinear Parton Distributions
Impact of Inclusive Electron Ion Collider Data on Collinear Parton Distributions Open
A study is presented of the impact of simulated inclusive Electron Ion Collider Deep Inelastic Scattering data on the determination of the proton and nuclear parton distribution functions (PDFs) at next-to-next-to-leading and next-to-leadi…
View article: Constraining the top-quark mass within the global MSHT PDF fit
Constraining the top-quark mass within the global MSHT PDF fit Open
We examine the ability of experimental measurements of top-quark pair production to constrain both the top-quark mass and the strong coupling within the global MSHT PDF fit. Specifically, we consider ATLAS and CMS measurements of different…
View article: PDF4LHC21: Update on the benchmarking of the CT, MSHT and NNPDF global PDF fits
PDF4LHC21: Update on the benchmarking of the CT, MSHT and NNPDF global PDF fits Open
There have been recent updates to the three global PDF fits (CT, MSHT and NNPDF), all adding large amounts of data from the LHC, and this has resulted in significant changes to the global PDFs. Given the impact that the new PDFs will have …
View article: The MSHT20 Parton Distribution Functions
The MSHT20 Parton Distribution Functions Open
We present the new MSHT20 set of parton distribution functions (PDFs) of the proton, determined from a global analysis of the available hard scattering data and superseding the MMHT14 sets. The parameterisation is now adapted and extended …
View article: The PDF4LHC21 combination of global PDF fits for the LHC Run III*
The PDF4LHC21 combination of global PDF fits for the LHC Run III* Open
A precise knowledge of the quark and gluon structure of the proton, encoded by the parton distribution functions (PDFs), is of paramount importance for the interpretation of high-energy processes at present and future lepton–hadron and had…
View article: PDF4LHC21: Update on the benchmarking of the CT, MSHT and NNPDF global PDF fits
PDF4LHC21: Update on the benchmarking of the CT, MSHT and NNPDF global PDF fits Open
There have been recent updates to the three global PDF fits (CT, MSHT and NNPDF), all adding large amounts of data from the LHC, and this has resulted in significant changes to the global PDFs. Given the impact that the new PDFs will have …