A5007404283- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Superconducting Materials and Applications
- Musicians’ Health and Performance
- Computational Physics and Python Applications
- Advanced Materials Characterization Techniques
- Black Holes and Theoretical Physics
Université Paris-Saclay
2024-2025
Centre National de la Recherche Scientifique
2024-2025
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2023-2025
Helsinki Institute of Physics
2022-2024
University of Helsinki
2022-2024
University of Jyväskylä
2021-2023
University of Liverpool
2019-2021
We present predictions for the cross sections of coherent $J/\ensuremath{\psi}$ photoproduction in lead-lead and oxygen-oxygen ultraperipheral collisions (UPCs) as a function rapidity at LHC framework collinear factorization next-to-leading order (NLO) perturbative QCD. Taking generalized parton distribution functions their forward limit using EPPS21, nNNPDF3.0, nCTEQ15WZSIH nuclear functions, we update our recent results Pb-Pb collisions, make detailed O-O several beam energy...
We present the first next-to-leading-order (NLO) perturbative QCD (pQCD) study of rapidity-differential cross sections coherent exclusive photoproduction $J/\ensuremath{\psi}$ mesons in heavy-ion ultraperipheral collisions (UPCs) at CERN Large Hadron Collider (LHC), $d\ensuremath{\sigma}/dy(\text{Pb}+\text{Pb}\ensuremath{\rightarrow}\text{Pb}+J/\ensuremath{\psi}+\text{Pb})$. For this, we account for photon-nucleon NLO forward limit, $t$ dependence using a standard nuclear form factor, and...
We compare the cross section for exclusive $J/\ensuremath{\psi}$ photoproduction calculated at next-to-leading order (NLO) in collinear factorization approach with HERA and LHCb data. Using optimum scale formalism together subtraction of low ${k}_{t}$ contribution (below input ${Q}_{0}$) from NLO coefficient function to avoid double counting, we show that existing global parton distribution functions (PDFs) are consistent data within their uncertainties. This is first time production were...
Abstract We propose a method which allows the inclusion of exclusive heavy vector-meson production data at low x in future global parton analyses. As an example we perform study within to determine gluon distribution function (PDF) next-to-leading order (NLO) moderate-to-low using measurements $$J/\psi $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> </mml:mrow> </mml:math> ep and pp collisions from HERA LHC....
The low $x$ behavior of the gluon density $xg(x,{\ensuremath{\mu}}^{2})$ at scale ${\ensuremath{\mu}}^{2}=2.4\text{ }\text{ }{\mathrm{GeV}}^{2}$ is determined using exclusive $J/\ensuremath{\psi}$ production data from HERA and LHCb within framework collinear factorization next-to-leading order (NLO). It shown that in interval $3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}<x<{10}^{\ensuremath{-}3}$ distribution function grows as...
We discuss exclusive J/ \psi <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi></mml:math> photoproduction, initially in conventional collinear factorisation at NLO and then subsequently a refined approach with programme of low x resummation implementation crucial Q_0 display="inline"><mml:msub><mml:mi>Q</mml:mi><mml:mn>0</mml:mn></mml:msub></mml:math> subtraction included. compare contrast predictions both frameworks remark about the possibility to...
The physics case for quarkonium-production studies accessible at the US Electron Ion Collider is described.
The cross section for exclusive $\mathrm{\ensuremath{\Upsilon}}$ ultraperipheral photoproduction at present and future colliders is determined using the low $x$ gluon parton distribution function extracted from an analysis of $J/\ensuremath{\psi}$ measurements performed Hadron-Electron Ring Accelerator Large Hadron Collider. Predictions are given next-to-leading order in collinear factorization over a wide $\ensuremath{\gamma}p$ centre-of-mass energy range, calculated assuming...
We present a formalism for determining the cross section exclusive heavy vector meson production ($J/\ensuremath{\psi},\mathrm{\ensuremath{\Upsilon}}$) as function of rapidity, in both high-energy proton-proton and proton-heavy ion collisions, at next-to-leading order QCD. compare contrast $pp$ $p$-Pb collisions show how data these processes can give information on low-$x$ gluon distribution proton ions range different scales.
We discuss the exclusive $J/\psi$ photoproduction process, as measured recently at LHCb, a means of constraining and ultimately determining low $x$ $Q$ gluon PDF. The scale dependence theoretical prediction for this process is shown to be systematically improved via taming known $\overline{\text{MS}}$ result, amounts resumming logarithmically enhanced small-$x$ terms implementing small-$Q$ power correction. cross section level predictions allow behaviour PDF in $(x, Q)$ domain determined.
We present the first study of coherent exclusive quarkonium ($J/\psi$, $\Upsilon$) photoproduction in ultraperipheral nucleus-nucleus collisions (UPCs) at LHC framework collinear factorization and next-to-leading order (NLO) perturbative QCD (pQCD). make NLO predictions for $J/\psi$ $\Upsilon$ rapidity distributions lead (Pb) oxygen (O) beams, quantify their dependence on factorization/renormalization scale, nuclear parton distribution functions (PDFs) uncertainties, differences between PDFs...
This paper is a write-up of the ideas that were presented, developed and discussed at fourth International Workshop on QCD Challenges from pp to AA, which took place in February 2023 Padua, Italy. The goal workshop was focus some open questions field high-energy heavy-ion physics stimulate formulation concrete suggestions for making progresses both experimental theoretical sides. gives brief introduction each topic then summarizes primary results.
We discuss the exclusive photoproduction of a heavy vector quarkonium, namely $J/\psi$ and $\Upsilon$ at 1-loop in $\alpha_s$. In collinear factorisation (CF), amplitude for such process is obtained by convolution hard partonic sub-amplitude, with universal generalised parton distribution (GPD). For first time, we perform complete calculation including full leading-log (LL) GPD evolution. demonstrate huge instability cross section high energies when scale $\mu_F$ varied. This has been...
This document summarizes the prospective physics plans of French QCD and Heavy-Ion community, including experimental programs at LHC Run 5 beyond future colliders CERN, within context contribution to update European Strategy in Particle Physics (ESPPU 2025), as discussed workshop on for Update 2025 organised by GdR Oct. 2024.
We discuss exclusive heavy vector-meson production using two approaches that mitigate the notoriously large scale dependence of collinear factorisation results at Next-to-Leading Order (NLO) in $\alpha_s$. perform a parton analysis one these within PDF fitting tool {\sc xFitter} to determine gluon moderate-to-low values $x$ based on ultraperipheral collision (UPC) measurements from LHC. emphasise combined fit heavy-quarkonium data multiple systems will not only deepen our understanding...
We discuss the exclusive photoproduction of a heavy vector quarkonium, namely $J/\psi$ and $\Upsilon$ at 1-loop in $\alpha_s$. In collinear factorisation (CF), amplitude for such process is obtained by convolution hard partonic sub-amplitude, with universal generalised parton distribution (GPD). For first time, we perform complete calculation including full leading-log (LL) GPD evolution. demonstrate huge instability cross section high energies when scale $\mu_F$ varied. This has been...
Abstract We present predictions for the rapidity-differential cross sections of exclusive $$\varUpsilon $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Υ</mml:mi> </mml:math> photoproduction in ultraperipheral collisions (UPCs) lead ions at Large Hadron Collider (LHC). work framework collinear factorization next-to-leading order (NLO) perturbative QCD, modeling generalized parton distributions (GPDs) through Shuvaev transform nuclear distribution functions (nPDFs). Our...