A5005345607- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- International Science and Diplomacy
- Physics of Superconductivity and Magnetism
- Astrophysics and Cosmic Phenomena
- History and advancements in chemistry
- Genetic factors in colorectal cancer
- Particle accelerators and beam dynamics
- Radio Astronomy Observations and Technology
- Numerical methods for differential equations
- Electromagnetic Simulation and Numerical Methods
- Ionosphere and magnetosphere dynamics
- Genomics and Chromatin Dynamics
- Relativity and Gravitational Theory
- Atomic and Subatomic Physics Research
UCLouvain
2012-2025
European Organization for Nuclear Research
2022-2024
University of Oslo
2023
Council of Science Editors
2018-2021
Technion – Israel Institute of Technology
2019-2021
Deutsches Elektronen-Synchrotron DESY
2016-2017
University of Birmingham
2017
Cornell University
2015-2016
We present the automation of one-loop computations in standard-model effective field theory at dimension six. Our general implementation, dubbed SMEFT@NLO, covers all types operators: bosonic, two- and four-fermion ones. Included ultraviolet rational counterterms presently allow for fully differential predictions, possibly matched to parton shower, up level strong coupling or four-quark operator coefficients. Exact flavor symmetries are imposed among light quark generations an initial focus...
We adopt a fully gauge-invariant effective-field-theory approach for parametrizing top-quark flavor-changing-neutral-current interactions. It allows global interpretation of experimental constraints (or measurements) and the systematic treatment higher-order quantum corrections. discuss some recent results obtained at next-to-leading-order accuracy in QCD perform, that order, first analysis subset available limits terms effective operator coefficients. encourage collaborations to this extend...
We apply on-shell methods to the bottom-up construction of electroweak amplitudes, allowing for both renormalizable and non-renormalizable interactions. use little-group covariant massive-spinor formalism, flesh out some its details along way. Thanks compact form resulting many their properties, in particular constraints perturbative unitarity, are easily seen this formalism. Our approach is purely bottom-up, assuming just standard-model spectrum as well conservation electric charge fermion...
This note proposes common standards and prescriptions for the effective-field-theory interpretation of top-quark measurements at LHC.
We perform a global effective-field-theory analysis to assess the precision on determination of Higgs trilinear self-coupling at future lepton colliders. Two main scenarios are considered, depending whether center-of-mass energy colliders is sufficient or not access pair production processes. Low-energy machines allow for ∼ 40% extraction coupling through exploitation next-to-leading-order effects in single measurements, provided that runs both 240/250 GeV and 350 available with luminosities...
The Compact Linear Collider (CLIC) is a mature option for the future of high energy physics. It combines benefits clean environment $e^+e^-$ colliders with operation at centre-of-mass energies, allowing to probe scales beyond reach Large Hadron (LHC) many scenarios new This places CLIC project privileged spot in between precision and frontiers, capabilities that will significantly extend knowledge on both fronts end LHC era. In this report we review revisit potential search, directly...
A bstract The Compact Linear Collider (CLIC) is a proposed future high-luminosity linear electron-positron collider operating at three energy stages, with nominal centre-of-mass energies $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 380 GeV, 1 . 5 TeV, and 3 TeV. Its aim to explore the frontier, providing sensitivity physics beyond Standard Model (BSM) precision measurements of processes an emphasis on Higgs...
A bstract The purely on-shell approach to effective field theories requires the construction of independent contact terms. Employing little-group-covariant massive-spinor formalism, we present first systematic derivation four-point terms involving massive scalars, spin-1 / 2 fermions, and vectors. Independent three-point amplitudes are also listed for particles up spin-3. We make extensive use simple relations between massless in this formalism. Our general results specialized (broken-phase)...
We establish a simple formula for the minimal dimension of operators leading to any helicity amplitude. It eases systematic enumeration independent from construction massless nonfactorizable on-shell amplitudes. Little-group constraints can then be solved algorithmically each configuration extract complete set spinor structures with lowest dimension. Occasionally, further reduction using momentum conservation, conditions and Schouten identities is required. A procedure account latter...
LEP precision on electroweak measurements was sufficient not to hamper the extraction of Higgs couplings at LHC. But foreseen permille-level future lepton colliders might suffer from parametric uncertainties in absence a dedicated program. We perform joint, complete and consistent effective-field-theory analysis processes. The full electroweak-sector dependence $e^+e^- \to WW$ production process is notably accounted for, using statistically optimal observables. Up-to-date HL-LHC projections...
Precision study of electroweak symmetry breaking strongly motivates the construction a lepton collider with center-of-mass energy at least 240 GeV. Besides Higgsstrahlung ($e^+e^- \to hZ$), such would measure weak boson pair production WW$) an astonishing precision. The weak-boson-fusion process \nu \bar{\nu} h$) provides increasingly powerful handle higher energies. High energies also benefit associated top-Higgs ($e^+e^-\to t\bar th$) that is crucial to constrain directly top Yukawa...
We study the sensitivity to physics beyond standard model of precise top-quark pair production measurements at future lepton colliders. A global effective-field-theory approach is employed, including all dimension-six operators Warsaw basis which involve a and give rise tree-level amplitudes that interfere with standard-model $e^+e^-\to t\,\bar t\to bW^+\bar bW^-$ ones in limit vanishing $b$-quark mass. Four-fermion CP-violating contributions are taken into account. Circular-collider-, ILC-...
We revisit the topic of triple-product asymmetries which probe $CP$ violation through differential distributions. construct distributions with well-defined discrete symmetry properties and characterize formed upon them. It is stressed that simplest may not be optimal. explore systematic generalizations having limited reliance on process dynamics phase-space parametrization. They exploit larger fractions information contained in lead to increased sensitivities violation. Our detailed...
Higgs boson compositeness is a phenomenologically viable scenario addressing the hierarchy problem. In minimal models, only degree of freedom strong sector below interaction scale. We present here simplest extension such framework with an additional composite spin-zero singlet. To this end, we adopt effective field theory approach and develop set rules to estimate size various operator coefficients, relating them parameters its structural features. As result, obtain patterns new interactions...
A bstract We study the on-shell version of Higgs mechanism in effective theories (EFTs) containing particles different spins, focusing on contact terms as a simple starting point. derive massive and their coefficients from massless amplitudes EFT above symmetry breaking scale, by covariantizing under little group. In little-group-covariant massive-spinor formalism, this notationally amounts to bolding spinor labels. Mass-suppressed contributions contact-term arise higher-point with...
We present a new on-shell method for the matching of ultraviolet models featuring massive states onto their massless effective field theory. employ dispersion relation in space complex momentum dilations to capture, single variable, relevant analytic structure scattering amplitudes at any multiplicity. Multivariate analysis and crossing considerations are therefore avoided. Remarkably, no knowledge about infrared theory is required dimensional regularisation. All information extracted from...
In this note, we give a definitive basis for the dimension-eight operators leading to quartic—but no cubic—interactions among electroweak gauge bosons. These are often called anomalous quartic couplings, or aQGCs. We distinguish in particular CP-even ones from their CP-odd counterparts.
A bstract We explore the double copy of effective field theories (EFTs), in recently proposed generalized color-kinematics and Kawai-Lewellen-Tye (KLT) approaches. In former, we systematically construct scalar numerators satisfying Jacobi identities from simpler numerator seeds with trace-like permutation properties. This construction has advantage being easily applicable to any multiplicity, which exemplify up 6-point. It employs linear map between color factors formed by single traces...
Could new physics first manifest itself in Higgs self-coupling measurements? In other words, how large could deviations the be, if and electroweak measurements are compatible with Standard Model predictions? Using theoretical arguments supported by concrete models we derive a bound on ratio of to single-Higgs coupling ultraviolet completions where parameters not fine-tuned. Broadly speaking, one-loop hierarchy is allowed. We thus stress that at LHC future colliders probe uncharted parameter...
Subject to strong experimental constraints at low energies, baryon number violation is nonetheless well motivated from a theoretical point of view. We examine the possibility observing baryon-number-violating top-quark production or decay hadron colliders. adopt model independent effective approach and focus on operators with minimal mass-dimension. Corresponding coefficients could be directly probed Large Hadron Collider (LHC) already an integrated luminosity 1 inverse femtobarn 7 TeV,...
A bstract We evaluate the implications of LHC and LEP/SLC measurements for electro-weak couplings top bottom quarks. derive global bounds on Wilson coefficients ten two-fermion operators in an effective field theory description. The combination hadron collider data with Z -pole is found to yield tight limits operator that modify left-handed quark boson. also present projections high-luminosity phase future electron-positron colliders. are expected improve substantially during remaining...
A bstract We extend the covariant color-kinematics duality introduced by Cheung and Mangan to effective field theories. focus in particular on relations between theories of gluons only coupled bi-adjoint scalars. Maps are established their respective equations motion tree-level scattering amplitudes. An additional rule for replacement flavor structures kinematic factors realizes map higher-derivative As an example new relations, pure-gluon amplitudes mass dimension up eight, featuring...