A5001430931- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Distributed and Parallel Computing Systems
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Scientific Computing and Data Management
- Computational Physics and Python Applications
- Neutrino Physics Research
- Superconducting Materials and Applications
- Software Engineering and Design Patterns
- Particle Accelerators and Free-Electron Lasers
- Scientific Research and Discoveries
- Parallel Computing and Optimization Techniques
- Medical Imaging Techniques and Applications
- Radioactive element chemistry and processing
- Photonic and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- advanced mathematical theories
- Quantum and Classical Electrodynamics
- Particle accelerators and beam dynamics
- Calibration and Measurement Techniques
- Relativity and Gravitational Theory
Laboratoire de Physique Théorique et Hautes Energies
2017-2025
Sorbonne Université
2017-2025
Centre National de la Recherche Scientifique
2016-2025
European Organization for Nuclear Research
2013-2022
Centre National pour la Recherche Scientifique et Technique (CNRST)
2022
Université Paris Cité
2017-2018
State Key Laboratory of Nuclear Physics and Technology
2011-2016
Peking University
2011-2016
Institut National de Physique Nucléaire et de Physique des Particules
2016
Université Paris-Sud
2016
We discuss the theoretical bases that underpin automation of computations tree-level and next-to-leading order cross sections, their matching to parton shower simulations, merging matched samples differ by light-parton multiplicities. present a computer program, MadGraph5_aMC@NLO, capable handling all these -- parton-level fixed order, shower-matched, merged in unified framework whose defining features are flexibility, high level parallelisation, human intervention limited input physics...
With nonrelativistic QCD factorization, we present a full next-to-leading order computation of the polarization observable for $J/psi$ production at hadron colliders including all important Fock states, i.e. $^3S_1[1,8]$, $^1S_0[8]$, and $^3P_J[8]$. We find $^3P_J[8]$ channel contributes positive longitudinal component negative transverse component. So puzzle may be understood as components canceling between $^3S_1[8]$ channels, which results in mainly unpolarized (even slightly...
The discovery of the Higgs boson in 2012, by ATLAS and CMS experiments, was a success achieved with only percent entire dataset foreseen for LHC. It opened landscape possibilities study properties, Electroweak Symmetry breaking Standard Model general, as well new avenues probing physics beyond Model. Six years after discovery, conspicuously larger collected during LHC Run 2 at 13 TeV centre-of-mass energy, theory experimental particle communities have started meticulous exploration potential...
We compute the contribution of order α 2 to cross section a top-antitop pair in association with at least one heavy Standard Model boson — Z, W ±, and Higgs by including all effects QCD, QED, weak origin working automated MadGraph5_aMC@NLO framework. This next-to-leading is then combined that 3 α, two dominant lowest-order ones, S 2, obtain phenomenological results relevant 8, 13, 100 TeV pp collider.
We present the key features relevant to automated computation of all leading- and next-to-leading order contributions short-distance cross sections in a mixed-coupling expansion, with special emphasis on first subleading NLO term QCD+EW scenario, commonly referred as EW corrections. discuss, particular, FKS subtraction context expansion; extension processes that include final-state tagged particles, defined by means fragmentation functions; some properties complex mass scheme. combine paper...
Abstract We present an update of the Universal FeynRules Output model format, commonly known as UFO that is used by several automated matrix-element generators and high-energy physics software. detail different features have been proposed extensions initial format during last ten years, collect them in current second version we coin Feynman format. Following philosophy UFO, they consist flexible modular additions to address particle decays, custom propagators, form factors, renormalisation...
By the virtues of Dyson-Schwinger equations, we upgrade published code \mtt{HELAC} to be capable calculate heavy quarkonium helicity amplitudes in framework NRQCD factorization, which dub \mtt{HELAC-Onia}. We rewrote original make new program able multi P-wave states production at hadron colliders and electron-positron by including off-shell currents. Therefore, besides high efficiencies computation multi-leg processes within Standard Model, \mtt{HELAC-Onia} is also sufficiently numerical...
We study the relevance of experimental data on heavy-flavor [${D}^{0}$, $J/\ensuremath{\psi}$, $B\ensuremath{\rightarrow}J/\ensuremath{\psi}$ and $\mathrm{\ensuremath{\Upsilon}}(1S)$ mesons] production in proton-lead collisions at LHC to improve our knowledge gluon-momentum distribution inside heavy nuclei. observe that nuclear effects encoded both most recent global fits parton densities next-to-leading order (nCTEQ15 EPPS16) provide a good overall description data. interpret this as hint...
We present the calculation of next-to-leading contribution order $\alpha_S^2\alpha^2$ to production a Standard Model Higgs boson in association with top-quark pair at hadron colliders. All effects weak and QCD origin are included, whereas those QED ignored. work MadGraph5_aMC@NLO framework, discuss sample phenomenological applications 8, 13, 100 TeV $pp$ collider, including dominant corrections $\alpha_S^3\alpha$.
Author(s): Contino, R; Curtin, D; Katz, A; Mangano, ML; Panico, G; Ramsey-Musolf, MJ; Zanderighi, Anastasiou, C; Astill, W; Bambhaniya, Behr, JK; Bizon, Dev, PS Bhupal; Bortoletto, Buttazzo, Cao, Q-H; Caola, F; Chakrabortty, J; Chen, C-Y; S-L; Florian, D de; Dulat, Englert, Frost, JA; Fuks, B; Gherghetta, T; Giudice, Gluza, Greiner, N; Gray, H; Hartland, NP; Issever, Jelinski, Karlberg, Kim, JH; Kling, Lazopoulos, Lee, SJ; Liu, Y; Luisoni, Mazzitelli, Mistlberger, Monni, P; Nikolopoulos, K;...
We demonstrate that the recent studies of J/ψ-pair production by CMS at LHC and D0 Tevatron reveal presence different mechanisms in kinematical regions. find out next-to-leading-order single parton scattering contributions αs5 dominate yield large transverse momenta pair. Our analysis further emphasises importance double scatterings – which are expected to J/ψ-rapidity differences invariant masses pair acceptance, thereby solve a discrepancy between theory data. In addition, we provide first...
We present next-to-next-to-next-to-leading order (N3LO) QCD predictions for the Higgs boson pair production via gluon fusion at hadron colliders in infinite top-quark mass limit. Besides inclusive total cross sections various collision energies, we also provide invariant distribution of pair. Our results show that N3LO corrections enhance next-to-next-to-leading section by 3.0% (2.7%) s=13(100)TeV, while scale uncertainty is reduced substantially below 3% (2%). find a judicious choice can...
The automated generation of arbitrary exclusive final states produced via photon fusion in ultraperipheral high-energy collisions protons and/or nuclei is implemented the MadGraph5_aMC@NLO and HelacOnia Monte Carlo codes. Cross sections are calculated equivalent approximation using $\gamma$ fluxes derived from electric dipole charge form factors, incorporating hadronic survival probabilities. Multiple examples $\gamma\gamma$ cross computed with this setup, named gamma-UPC, presented for...
We proceed for the first time to evaluation of Born cross section J / ψ + η(c) production, namely, via g → J/ψ+ g, and show that it has a harder P(T) spectrum than J/ψ-pair yield at level. If one stuck comparison level, would conclude production surpass large P(T). This is nonetheless not case since ψ-pair as single ψ, receives leading-P(T) contributions higher orders in α(s). also present these next-to-leading order contributions. These are indeed significant increasing essential relevance...
We present a complete evaluation for the prompt η_{c} production at LHC next-to-leading order in α_{s} nonrelativistic QCD. By assuming heavy-quark spin symmetry, recently observed data by LHCb results very strong constraint on upper bound of color-octet long-distance matrix element ⟨O^{J/ψ}(^{1}S_{0}^{[8]})⟩ J/ψ. find this is consistent with our previous study J/ψ yield and polarization can give good descriptions measurements, but inconsistent some other theoretical estimates. This may...
We give predictions of J/ψ and ψ(2S) yields polarizations in prompt production at hadron colliders based on non-relativistic QCD factorization formula. calculate short-distance coefficients all important color-octet intermediate channels as well color-singlet up to $$ \mathcal{O}\left({\alpha}_S^4\right) , i.e. next-to-leading order α S . For production, we also take into account feeddown contributions from χ cJ (J=0,1,2) decays. Color-singlet long-distance matrix elements (LDMEs) are...
This report summarises the physics opportunities for study of Higgs bosons and dynamics electroweak symmetry breaking at 100 TeV pp collider.
We propose a simple and model-independent procedure to account for the impact of nuclear modification gluon density as encoded in collinear PDF sets on two-to-two partonic hard processes proton-nucleus collisions. This applies good approximation quarkonium, D B meson production, generically referred H. Our consists parametrising square parton scattering amplitude, A_{gg -> H X} constraining it from proton-proton data. Doing so, we have been able compute corresponding factors J/psi, Upsilon...
A bstract The Higgs boson pair production via gluon fusion at high-energy hadron colliders, such as the LHC, is vital in deciphering potential and pinning down electroweak symmetry breaking mechanism. We carry out next-to-next-to-next-to- leading order (N 3 LO) QCD calculations infinite top-quark mass limit present predictions for both inclusive differential cross sections, albeit distributions other than invariant distribution of are approximated N LO. Such corrections indispensable...
We report a new calculation of the soft-gluon threshold resummation for Higgs boson pair production in dominant mode -- gluon-gluon fusion up to next-to-next-to-next-to-leading logarithmic (N$^3$LL) accuracy. After matching N$^3$LL order (N$^3$LO) QCD infinite top quark mass approximation, we show that central values inclusive cross sections are quite stable with respect N$^3$LO, while conventional renormalisation and factorisation scale uncertainties reduced by factor two, reaching...
The recent experimental observation of Light-by-Light (LbL) scattering at the Large Hadron Collider has revived interest in this fundamental process, and especially accurate prediction its cross-section, which we present here for first time Next-to-Leading Order (NLO) both QCD QED. We compare two radically different computational approaches, exact fermion mass dependence, thus offering a strong cross-check our results. approach is fully analytic method to calculate compact well-organized...
$\Upsilon(nS)$ and $\chi_b(nP)$ (n=1,2,3) production at the LHC is studied next-to-leading order in $\alpha_s$ nonrelativistic QCD. Feeddown contributions from higher $\chi_b$ $\Upsilon$ states are all considered for lower cross sections polarizations. The long distance matrix elements (LDMEs) extracted yield data, then used to make predictions polarizations, which found be consistent with measured polarization data within errors. In particular, $\Upsilon(3S)$ puzzle can understood by a...