A5007209869- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Quantum, superfluid, helium dynamics
- Particle Detector Development and Performance
- Nuclear physics research studies
- Cold Atom Physics and Bose-Einstein Condensates
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2021-2025
Université Paris-Saclay
2022-2024
Centre National de la Recherche Scientifique
2022-2024
Institut National de Physique Nucléaire et de Physique des Particules
2019
Institut de Physique
2019
Abstract We cure the perturbative instability of total-inclusive-photoproduction cross sections vector S -wave quarkonia observed at high photon-proton-collision energies ( $$\sqrt{s_{\gamma p}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mrow> <mml:mi>γ</mml:mi> <mml:mi>p</mml:mi> </mml:mrow> </mml:msub> </mml:msqrt> </mml:math> ) in Next-to-Leading Order (NLO) Collinear-Factorisation (CF) computations. This is achieved using...
A bstract We compute, in the framework of renormalon calculus, $$ \mathcal{O}\left({\Lambda}_{\textrm{QCD}}\right) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> <mml:mfenced> <mml:msub> <mml:mi>Λ</mml:mi> <mml:mi>QCD</mml:mi> </mml:msub> </mml:mfenced> </mml:math> corrections to production t\overline{t} <mml:mi>t</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> pairs hadron collisions under assumption that q\overline{q}\to <mml:mi>q</mml:mi>...
We revisit inclusive J/psi and Upsilon photoproduction at lepton-hadron colliders, namely in the limit when exchanged photon is quasi real. Our computation includes next-to-leading-order (NLO) alpha_s corrections to leading-order contributions v. Similarly case of NLO charmonium-hadroproduction processes, resulting cross sections obtained MS-bar factorisation scheme are sometimes found be negative. show that scale-fixing criteria which we derived a previous study eta(c) production...
Abstract We address the unphysical energy dependence of quarkonium-hadroproduction cross sections at Next-to-Leading Order (NLO) in $$\alpha _s$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub> </mml:math> which we attribute to an over-subtraction factorisation collinear singularities inside PDFs $$\overline{\text {MS}}$$ <mml:mover> <mml:mtext>MS</mml:mtext> <mml:mo>¯</mml:mo> </mml:mover> scheme. Such over- or...
A bstract We present the analytic expressions for two-loop form factors production or decay of pseudo-scalar quarkonia, in a scheme where quarks are produced at threshold. consider amplitude process $$ \gamma \leftrightarrow {}^1{S}_0^{\left[1\right]} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γγ</mml:mi> <mml:mo>↔</mml:mo> <mml:mmultiscripts> <mml:msubsup> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> <mml:mfenced> <mml:mn>1</mml:mn> </mml:mfenced> </mml:msubsup>...
A bstract The energy dependence of the total hadroproduction cross section pseudoscalar quarkonia is computed via matching Next-to-Leading Order (NLO) Collinear-Factorisation (CF) results with resummed higher-order corrections, proportional to $$ {\alpha}_s^n{\ln}^{n-1} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> <mml:mi>n</mml:mi> </mml:msubsup> <mml:msup> <mml:mo>ln</mml:mo> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn>...
A bstract We use an abelian model to study linear power corrections which arise from infrared renormalons and affect event shapes in e + − annihilation into hadrons. While previous studies explored the two-jet region, this paper we focus on three-jet is most relevant one for determination of strong coupling constant. show that a broad class shape variables, can be written factorised form, involves analytically-calculable function, characterises changes variable when soft parton emitted,...
A bstract We compute the master integrals relevant for two-loop corrections to pseudo-scalar quarkonium and leptonium production decay. present both analytic high-precision numerical results. The expressions are given in terms of multiple polylogarithms (MPLs), elliptic (eMPLs) iterated Eisenstein series. As an application our results, we obtain first time expression amplitude para-positronium decay two photons at loops.
We discuss the linear power corrections to electroweak production of top quarks at LHC using renormalon calculus. show how such non-perturbative can be obtained Low-Burnett-Kroll theorem, which provides first subleading term expansion real-emission amplitudes around soft limit. demonstrate that there are no total cross sections arbitrary processes a single type provided these expressed in terms short-distance quark mass. also derive universal formula for generic observables involve top-quark...
We explore how the positivity of $P_T$-integrated $\eta_c$-hadroproduction cross-section computed at NLO in $\alpha_s$ can set up constraints on $x$-dependence gluon PDFs low scales.
The energy dependence of the total hadroproduction cross section pseudo-scalar quarkonia is computed via matching Next-to-Leading Order (NLO) Collinear-Factorisation (CF) results with resummed higher-order corrections, proportional to $\alpha_s^{n}\ln^{n-1}(1/z)$, CF hard-scattering coefficient, where $z=M^2/\hat{s}$ $M$ and $\hat{s}$ being quarkonium mass partonic center-of-mass squared. resummation performed using High-Energy Factorisation (HEF) in Doubly-Logarithmic (DL) approximation,...
We consider top quark production and decay in the narrow width approximation study if polarisation effects, that manifest themselves correlations of angular distributions particles from decays final state jets sub-process, are affected by linear power corrections. find that, general, answer to this question is affirmative. also discuss how these non-perturbative corrections affect observables used single at LHC. Finally, we point out generic kinematic leptons corrections, which may have...
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 the linear power corrections to electroweak production of top quarks at LHC using renormalon calculus. show how such non-perturbative can be obtained Low-Burnett-Kroll theorem, which provides first subleading term expansion real-emission amplitudes around soft limit. demonstrate that there are no total cross sections arbitrary processes a single type provided these expressed in terms short-distance quark mass. also derive universal formula for generic observables involve top-quark...
We cure the perturbative instability of total-inclusive-photoproduction cross sections vector $S$-wave quarkonia observed at high photon-proton-collision energies ($\sqrt{s_{\gamma p}}$) in Next-to-Leading Order (NLO) Collinear-Factorisation (CF) computations. This is achieved using High-Energy Factorisation (HEF) Doubly-Logarithmic Approximation (DLA), which a subset Leading-Logarithmic (LLA) HEF resums higher-order QCD corrections proportional to $\alpha_s^n \ln^{n-1} (\hat{s}/M^2)$ Regge...
We compute, in the framework of renormalon calculus, ${\cal O}(\Lambda_{\rm QCD})$ corrections to production $t\bar{t}$ pairs hadron collisions under assumption that $q \bar q \to t t$ is dominant partonic channel. This not applicable top quark pair at LHC but it valid for Tevatron where protons and anti-protons were studied. show linear power correction total $t cross section vanishes provided one uses a short-distance scheme mass. also derive relatively simple formulas kinematic...
We explore how the positivity of P_T-integrated eta_c-hadroproduction cross-section computed at NLO in alpha_s can set up constraints on x-dependence gluon PDFs low scales.
We use an abelian model to study linear power corrections which arise from infrared renormalons and affect event shapes in $e^+e^-$ annihilation into hadrons. While previous studies explored the two-jet region, this paper we focus on three-jet is most relevant one for determination of strong coupling constant. show that a broad class shape variables, can be written factorised form, involves analytically-calculable function, characterises changes variable when soft parton emitted, constant...
We present the analytic expressions for two-loop form factors production or decay of pseudo-scalar quarkonia, in a scheme where quarks are produced at threshold. consider amplitude process $γγ\leftrightarrow {^1S_0^{[1]}}$, that was previously known only numerically, as well processes $gg \leftrightarrow $γg {^1S_0^{[8]}}$ and {^1S_0^{[8]}}$, which have not been computed before. The corrections to {^1S_0^{[1]}}$ last missing ingredients full NNLO calculation $η_Q$ hadro-production. discuss...
We revisit inclusive J/psi and Upsilon photoproduction at lepton-hadron colliders, namely in the limit when exchanged photon is quasi real. Our computation includes next-to-leading-order (NLO) alpha_s corrections to leading-order contributions v. Similarly case of NLO charmonium-hadroproduction processes, resulting cross sections obtained MS-bar factorisation scheme are sometimes found be negative. show that scale-fixing criteria which we derived a previous study eta(c) production...