A. M. Cooper-Sarkar
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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: Science4Peace: A Plea for Continued Peaceful International Scientific Cooperation (Input to the European Strategy for Particle Physics -- 2026 update)
Science4Peace: A Plea for Continued Peaceful International Scientific Cooperation (Input to the European Strategy for Particle Physics -- 2026 update) Open
The European Strategy for Particle Physics (ESPP) - 2026 update is taking place in a turbulent international climate. Many of the norms that have governed relations between states for decades are being broken or challenged. The future prog…
View article: The Large Hadron electron Collider as a bridge project for CERN
The Large Hadron electron Collider as a bridge project for CERN Open
The LHeC is the project for delivering electron-nucleon collisions at CERN using the HL-LHC beams. An Energy Recovery Linac in racetrack configuration will provide 50 GeV electrons to achieve centre-of-mass energies around 1 TeV/nucleon an…
Study of Gas Electron Multiplier Detector Using ANSYS and GARFIELD$^{++}$ Open
Micro-Pattern Gas Detectors (MPGDs) represent a category of gaseous ionization detectors that utilize microelectronics. They feature a remarkably small distance between the high potential difference anode and cathode electrodes and are typ…
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: 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 azimuthal correlation between the leading jet and the scattered lepton in deep inelastic scattering at HERA
The azimuthal correlation between the leading jet and the scattered lepton in deep inelastic scattering at HERA Open
The azimuthal correlation angle, $\Delta \phi $, between the scattered lepton and the leading jet in deep inelastic $e^{\pm }p$ scattering at HERA has been studied using data collected with the ZEUS detector at a centre-of-mass energy of $…
View article: Measurement of jet production in deep inelastic scattering and NNLO determination of the strong coupling at ZEUS
Measurement of jet production in deep inelastic scattering and NNLO determination of the strong coupling at ZEUS Open
A new measurement of inclusive-jet cross sections in the Breit frame in neutral current deep inelastic scattering using the ZEUS detector at the HERA collider is presented. The data were taken in the years 2004–2007 at a centre-of-mass ene…
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…
Parton Distribution Functions for discovery physics at the LHC Open
At the LHC we are colliding protons, but it is not the protons that are doing the interacting. It is their constituents the quarks, antiquarks and gluons-collectively known as partons. We need to know how what fractional momentum of the pr…
View article: Search for effective Lorentz and CPT violation using ZEUS data
Search for effective Lorentz and CPT violation using ZEUS data Open
Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS $e^{\pm} p$ data. Symmetry-violating effects can lead to time-dependent oscillations of otherwise time-in…
View article: Precision QCD, Hadronic Structure & Forward QCD, Heavy Ions: Report of Energy Frontier Topical Groups 5, 6, 7 submitted to Snowmass 2021
Precision QCD, Hadronic Structure & Forward QCD, Heavy Ions: Report of Energy Frontier Topical Groups 5, 6, 7 submitted to Snowmass 2021 Open
This report was prepared on behalf of three Energy Frontier Topical Groups of the Snowmass 2021 Community Planning Exercise. It summarizes the status and implications of studies of strong interactions in high-energy experiments and QCD the…
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…
The strong coupling constant: State of the art and the decade ahead Open
This document provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling $\\alpha_s$. The current status of the seven methods presently used to deter…
View article: Upgrade of the CMS resistive plate chambers for the high luminosity LHC
Upgrade of the CMS resistive plate chambers for the high luminosity LHC Open
During the upcoming High Luminosity phase of the Large Hadron Collider (HL-LHC), the integrated luminosity of the accelerator will increase to 3000 fb −1 . The expected experimental conditions in that period in terms of background rates, e…
View article: xFitter: An Open Source QCD Analysis Framework - A resource and reference document for the Snowmass study
xFitter: An Open Source QCD Analysis Framework - A resource and reference document for the Snowmass study Open
We provide an overview of the xFitter open-source software package, review the general capabilities of the program, and highlight applications relevant to the Snowmass study. An updated version of the program (2.2.0) is available on CERN G…
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
This document provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling $\alpha_s$. The current status of the seven methods presently used to determ…
View article: Snowmass 2021 Whitepaper: Proton Structure at the Precision Frontier
Snowmass 2021 Whitepaper: Proton Structure at the Precision Frontier Open
An overwhelming number of theoretical predictions for hadron colliders require parton distribution functions (PDFs), which are an important ingredient of theory infrastructure for the next generation of high-energy experiments. This whitep…
View article: Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions
Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions Open
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of the HERA data on inclusive deep inelastic $ep$ scattering together wit…
View article: The Large Hadron–Electron Collider at the HL-LHC
The Large Hadron–Electron Collider at the HL-LHC Open
The Large Hadron–Electron Collider (LHeC) is designed to move the field of deep inelastic scattering (DIS) to the energy and intensity frontier of particle physics. Exploiting energy-recovery technology, it collides a novel, intense electr…
View article: Azimuthal correlations in photoproduction and deep inelastic $\boldsymbol{ep}$ scattering at HERA
Azimuthal correlations in photoproduction and deep inelastic $\boldsymbol{ep}$ scattering at HERA Open
Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity $ep$ scattering at a centre-of-mass energy $\sqrt{s}=318$ GeV with the ZEUS detector at HERA. Two- and four-particle azimuthal corre…
View article: Front-end electronics for CMS iRPC detectors
Front-end electronics for CMS iRPC detectors Open
A new generation of resistive plate chambers, capable of withstanding high particle fluxes (up to 2000 Hz · cm -2 ) and instrumented with precise timing readout electronics is proposed to equip two of the four high pseudorapidity stations …
View article: Aging study on Resistive Plate Chambers of the CMS Muon Detector for HL-LHC
Aging study on Resistive Plate Chambers of the CMS Muon Detector for HL-LHC Open
In the High Luminosity Large Hadron Collider (HL-LHC) program, during the\nnext years, the instantaneous luminosity will increase up to 5 $\\times$\n10$^{34}$ cm$^{-2}$ s$^{-1}$ which means a factor five higher than the nominal\nLHC. In th…
Simultaneous extraction of $α_s$ and $m_t$ from LHC $t\bar{t}$ differential distributions Open
We present a joint extraction of the strong coupling $α_s$ and the top-quark pole mass $m_t$ from measurements of top-quark pair production performed by the ATLAS and CMS experiments at the 8 TeV LHC. For the first time, differential NNLO …