A5058653459- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Obesity, Physical Activity, Diet
- Astrophysics and Cosmic Phenomena
- Nutrition and Health in Aging
- Atomic and Subatomic Physics Research
- Advanced Data Storage Technologies
- Diabetes, Cardiovascular Risks, and Lipoproteins
- Sleep and related disorders
- Medical Imaging Techniques and Applications
- International Science and Diplomacy
- Quantum many-body systems
- Markov Chains and Monte Carlo Methods
- Particle Accelerators and Free-Electron Lasers
- Adipokines, Inflammation, and Metabolic Diseases
- Cardiac, Anesthesia and Surgical Outcomes
- Frailty in Older Adults
National Institute for Subatomic Physics
2021-2025
University of Amsterdam
2023-2025
Rutherford Appleton Laboratory
2023-2024
Vrije Universiteit Amsterdam
2021-2024
Agostino Gemelli University Polyclinic
2024
Università Cattolica del Sacro Cuore
2024
Istituti di Ricovero e Cura a Carattere Scientifico
2024
New York University
2024
Atlas Scientific (United States)
2024
European Organization for Nuclear Research
2023
We present a new set of parton distribution functions (PDFs) based on fully global dataset and machine learning techniques: NNPDF4.0. expand the NNPDF3.1 determination with 44 datasets, mostly from LHC. derive novel methodology through hyperparameter optimisation, leading to an efficient fitting algorithm built upon stochastic gradient descent. use NNLO QCD calculations account for NLO electroweak corrections nuclear uncertainties. Theoretical improvements in PDF description include...
Abstract The theory of the strong force, quantum chromodynamics, describes proton in terms quarks and gluons. is a state two up one down quark bound by gluons, but predicts that addition there an infinite number quark–antiquark pairs. Both light heavy quarks, whose mass respectively smaller or bigger than proton, are revealed inside high-energy collisions. However, it unclear whether also exist as part wavefunction, which determined non-perturbative dynamics accordingly unknown: so-called...
Abstract We formulate a general approach to the inclusion of theoretical uncertainties, specifically those related missing higher order uncertainty (MHOU), in determination parton distribution functions (PDFs). demonstrate how, under quite generic assumptions, theory uncertainties can be included as an extra contribution covariance matrix when determining PDFs from data. then review, clarify, and systematize use renormalization factorization scale variations means estimate MHOUs consistently...
Abstract We present the software framework underlying NNPDF4.0 global determination of parton distribution functions (PDFs). The code is released under an open source licence and accompanied by extensive documentation examples. base composed a PDF fitting package, tools to handle experimental data efficiently compare it theoretical predictions, versatile analysis framework. In addition ensuring reproducibility (and subsequent) determination, public release NNPDF enables number...
Abstract Proton-proton collisions at the LHC generate a high-intensity collimated beam of neutrinos in forward (beam) direction, characterised by energies up to several TeV. The recent observation FASER $$\nu $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>ν</mml:mi> </mml:math> and SND@LHC signifies that this previously overlooked particle is now available for scientific investigation. Here we quantify impact neutrino deep-inelastic scattering (DIS) measurements would...
A bstract We present SMEF i T3.0, an updated global SMEFT analysis of Higgs, top quark, and diboson production data from the LHC complemented by electroweak precision observables (EWPOs) LEP SLD. consider recent inclusive differential measurements Run II, alongside with a novel implementation EWPOs based on independent calculations relevant EFT contributions. estimate impact HL-LHC parameter space when added through dedicated projections extrapolating II data. quantify significant...
We provide a first quantitative indication that the wave function of proton contains unequal distributions charm quarks and antiquarks, i.e., nonvanishing intrinsic valence distribution. A significant component cannot be perturbatively generated; hence, our results reinforce previous evidence an (i.e., not radiatively generated) quark component. establish result through determination parton distribution functions antiquarks in proton. propose two novel experimental probes this component:...
Abstract We construct a set of parton distribution functions (PDFs), based on the recent NNPDF4.0 PDF set, that also include photon PDF. The is constructed using LuxQED formalism, while QED evolution accounting for $${\mathcal {O}}\left( \alpha \right) $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>O</mml:mi> <mml:mfenced> <mml:mi>α</mml:mi> </mml:mfenced> </mml:mrow> </mml:math> , _s\right) <mml:msub> <mml:mi>s</mml:mi> </mml:msub> and ^2\right) <mml:msup>...
Abstract We include uncertainties due to missing higher order corrections QCD computations (MHOU) used in the determination of parton distributions (PDFs) recent NNPDF4.0 set PDFs. use our previously published methodology, based on treatment MHOUs and their full correlations through a theory covariance matrix determined by scale variation, now fully incorporated new NNPDF pipeline. assess impact inclusion central values uncertainties, specifically show that they lead improved consistency PDF...
Abstract The parton distribution functions (PDFs) which characterize the structure of proton are currently one dominant sources uncertainty in predictions for most processes measured at Large Hadron Collider (LHC). Here we present first extraction PDFs that accounts missing higher order (MHOU) fixed-order QCD calculations used PDF determinations. We demonstrate MHOU can be included as a contribution to covariance matrix fit, and then introduce prescriptions computation this using scale...
A bstract We revise the relation between Parton Distribution Functions (PDFs) and matrix elements computable from lattice QCD, focusing on quasi-Parton (qPDFs) approach. exploit PDFs qPDFs in case of unpolarized isovector parton distribution to obtain a factorization formula relating real imaginary part specific nonsinglet distributions, we propose general framework extract available data, treating them same footing as experimental data. implement proposed approach within NNPDF framework,...
A bstract We extract two nonsinglet nucleon Parton Distribution Functions from lattice QCD data for reduced Ioffe-time pseudodistributions. perform such analysis within the NNPDF framework, considering coming different ensembles and dis- cussing in detail treatment of source systematics involved fit. introduce a recipe taking care use it to our extraction light-cone PDFs.
Abstract We discuss the Bayesian approach to solution of inverse problems and apply formalism analyse closure tests performed by NNPDF collaboration. Starting from a comparison with that is currently used for determination parton distributions (PDFs), we some analytical results can be obtained linear use these as guidance more complicated non-linear problems. show that, in case Gaussian distributions, posterior probability density parametrized PDFs fully determined fitting procedure....
Abstract We present a systematic investigation of jet production at hadron colliders from phenomenological point view, with the dual aim providing validation theoretical calculations and guidance to future determinations parton distributions (PDFs). account for all available inclusive dijet measurements ATLAS CMS 7 8 TeV by including them in global PDF determination, comparing predictions NNLO QCD supplemented electroweak (EW) corrections. assess compatibility PDFs, specifically gluon,...
We train a set of restricted Boltzmann machines (RBMs) on one- and two-dimensional Ising spin configurations at various values temperature, generated using Monte Carlo simulations. validate the training procedure by monitoring several estimators, including measurements log likelihood, with corresponding partition functions estimated annealed importance sampling. The effects choices hyperparameters RBM are discussed in detail, generic prescription provided. Finally, we present closed-form...
Abstract We revisit our argument that shows parton distribution functions (PDFs) in the $$\overline{\textrm{MS}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mtext>MS</mml:mtext> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> scheme are non-negative perturbative region, with dual goals of clarifying its theoretical underpinnings and elucidating domain validity. specifically discuss recent results proving PDFs can turn negative at sufficiently low scale, we...
Abstract We discuss a Bayesian methodology for the solution of inverse problem underlying determination parton distribution functions (PDFs). In our approach, Gaussian processes (GPs) are used to model PDF prior, while Bayes’ theorem is in order determine posterior PDFs given set data. general formalism, inference at level both parameters and hyperparameters, simplifications which occur when observable entering analysis linear PDF. benchmark new two simple examples single flavor from deep...
We include uncertainties due to missing higher order corrections QCD computations (MHOU) used in the determination of parton distributions (PDFs) recent NNPDF4.0 set PDFs. use our previously published methodology, based on treatment MHOUs and their full correlations through a theory covariance matrix determined by scale variation, now fully incorporated new NNPDF pipeline. assess impact inclusion central values uncertainties, specifically show that they lead improved consistency PDF with an...
A bstract We review recent theoretical developments concerning the definition and renormalization of equal-time correlators that can be computed on lattice related to Parton Distribution Functions (PDFs) through a factorization formula. show how these objects studied analyzed within framework nongauge theory, gaining insight one-loop computation. use scalar field theory as playground revise, analyze present main features ideas, explore their potential, understand limitations for extracting...
We revisit our argument that shows parton distribution Functions (PDFs) in the MSbar{ scheme are non-negative perturbative region, with main goals of elucidating its domain validity and clarifying theoretical underpinnings. specifically discuss recent results proving PDFs can turn negative at sufficiently low scale, we clarify quantitatively various aspects derivation positivity provide an estimate for scale above which PDF holds.
We show that a simple and accurate approach to the computation of hadron collider processes involving initial-state b quarks can be obtained by introducing an independently parametrized PDF. use so-called FONLL method for matching scheme in which quark is treated as massless parton it massive state, extend case PDF not necessarily determined perturbative conditions. This generalizes hadronic collisions analogous results previously deep-inelastic scattering. The corresponds "massive b"...