A5030919296- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Physics of Superconductivity and Magnetism
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Neutrino Physics Research
- Electromagnetic Simulation and Numerical Methods
- Atomic and Subatomic Physics Research
- Mathematical Analysis and Transform Methods
- Numerical methods in inverse problems
- Quantum and electron transport phenomena
- Spectral Theory in Mathematical Physics
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- History and advancements in chemistry
European Organization for Nuclear Research
2024
École Polytechnique Fédérale de Lausanne
2020-2022
University of Geneva
2019-2021
Universitat Autònoma de Barcelona
2018
Institute for High Energy Physics
2016-2018
The authors study the consequence of unitarity, causality and crossing on forward $2\ensuremath{-}>2$ scattering amplitudes in quantum field theories. Out an infinite set energy dependent quantities, they identify optimal finite subset constraints, suitable to bound effective theories at any order expansion. may help determine acceptable range validity both couplings energy.
One-point correlators of conserved charges are argued to be perturbatively IR safe in quantum chromodynamics (QCD), which includes not only the density energy, but also those electric charge, isospin, and baryon number. Theoretical phenomenological aspects matrix one-point discussed context states produced by a chiral current, as decay polarized electroweak boson. Densities some nonconserved such energy with arbitrary non-negative powers, despite their incalculability, shown obey an infinite...
The Higgs self-coupling is notoriously intangible at the LHC. It was recently proposed to probe trilinear interaction through its radiative corrections single-Higgs processes. This approach however requires disentangle these effects from those associated deviations of other Higgs-couplings fermions and gauge bosons. We show that a global fit exploiting only inclusive data suffers degeneracies prevent one extracting robust bounds on each individual coupling. how inclusion double-Higgs...
A bstract The ACME collaboration has recently reported a new bound on the electric dipole moment (EDM) of electron, | d e < 1.1 × 10 −29 · cm at 90% confidence level, reaching an unprecedented accuracy level. This can translate into relevant constraints theories beyond SM laying TeV scale, even when they contribute to electron EDM two-loop We use EFT approach classify these corrections, presenting contributions anomalous dimension CP-violating operators up Selection rules based helicity...
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...
We use the current CMS and ATLAS data for leptonic $pp \to WW, WZ$ channels to show that diboson production is, a broad class of flavour models, already competitive with LEP-1 measurements setting bounds on dimension six operators parametrising anomalous couplings between quarks electroweak gauge bosons, at least under assumption any new particle is heavier than few TeV. also make an estimate HL-LHC reach $3$ ab$^{-1}$. comment possible BSM interpretations bounds, interplay other searches...
We show how calculable IR loop effects impact positivity bounds in effective field theories with causal and unitary UV completions. identify infrared singularities that appear dispersion relations at $|t|\ensuremath{\lesssim}{m}^{2}$. In the massless limit, they weaken two-sided based on crossing symmetry, such as lower bound amplitude for Galileon scattering. For amplitudes are analytic $s$ even large negative $t$, i.e., $|t|\ensuremath{\gg}{m}^{2}$, we propose a new simple approach to...
A bstract We use the on-shell S-matrix and form factors to compute anomalous dimensions of higher dimension operators in Standard Model Effective Field Theory. find that many instances, these computations are made simple by using method. first contributions at dimension-six arise one-loop. Then we calculate two-loop for which corresponding one-loop contribution is absent, this powerful
The measurement of Higgs couplings constitutes an important part present standard model precision tests at colliders. We show that modifications induce energy-growing effects in specific amplitudes involving longitudinally polarized vector bosons, and we initiate a novel program to study these off shell high energy, rather than on the resonance. Our analysis suggests channels are complementary competitive with familiar on-shell measurements; moreover, they offer endless opportunities for...
Universal theories are a broad class of well-motivated microscopic dynamics the electroweak sector that go beyond Standard Model description. The long distance physics is described by parameters which correspond to local operators in effective field theory. We show how unitarity and analyticity constrain space parameters. In particular, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>W</a:mi></a:math> <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
We consider a singlet extension of the Standard Model (SM) with spontaneous $Z_2$ breaking and study gluon-gluon fusion production heavy scalar, subsequent decay into pair SM-like Higgs bosons. find that an on-shell interference effect can notably enhance resonant di-Higgs rate up to 40\%. In addition, consistently taking account both off-shell effects between scalar SM diagrams significantly improves HL-LHC HE-LHC reach in this channel. As example, within effective field theory analysis...
Hamiltonian Truncation Methods are a useful numerical tool to study strongly coupled QFTs. In this work we present new method compute the exact corrections, at any order, in approach presented by Rychkov et al. Refs. [1-3]. The is general but as an example calculate $g^2$ and some of $g^3$ contributions for $\phi^4$ theory two dimensions. coefficients local expansion calculated Ref. [1] shown be given phase space integrals. addition find approximations speed up calculations implement them...
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
Energy correlators are field-theoretically clean and phenomenologically valuable probes of QCD dynamics. We explore the possibility using information encoded in energy a hadronically decaying electroweak vector boson order to extract its full decay density matrix. The kinematics one- two-point can indeed discriminate between longitudinal transverse modes reveal interference pattern different polarizations. Such observables improve sensitivity microscopic new physics affecting production rate...
The recently observed excess in diphoton events at around 750 GeV can be satisfactorily described terms of a new spin-0 real singlet with effective interactions to the gauge bosons. In this letter we first review current constraints on setup. We further explore production association boson. show potential channel unravel flat directions allowed parameter space. then study two different asymmetries for disentangling CP nature such both gluon fusion and vector-boson fusion. For matter, perform...
A bstract We investigate CP-violating effects induced by light top partners in composite Higgs theories. find that sizable contributions to the dipole moments of SM quarks and leptons are generically generated at two-loop level through Barr-Zee-type diagrams. The present constraints on electron neutron electric translate into bounds partner masses order few TeV competitive with reach LHC direct searches. Interestingly, we CP-violation sensitive same operators control single production....
One-point correlators of conserved charges are argued to be perturbatively IR safe in QCD, which includes not only the density energy, but also those electric charge, isospin and baryon number. Theoretical phenomenological aspects matrix one-point discussed context states produced by a chiral current, as decay polarized electroweak boson. Densities some non-conserved such energy with arbitrary non-negative powers, despite their incalculability, shown obey an infinite set consistency...
A bstract Matrix elements of Wilson-line dressed operators play a central role in the factorization soft and collinear modes gauge theories. When expressed using spinor helicity variables, these so-called form factors admit classification starting from Maximally Helicity Violating configuration, close analogy with theory amplitudes. We show that single-line complex momentum shift can be used to derive recursion relations efficiently compute at tree-level: combination lower point on-shell...
Universal theories are a broad class of well-motivated microscopic dynamics the electroweak sector that go beyond Standard Model description. The long distance physics is described by parameters which correspond to local operators in Effective Field Theory. We show how unitarity and analyticity constrain space parameters. In particular, $W$ $Y$ constrained be positive necessarily leading terms low energy expansion. assess impact on interpretation Drell-Yan data. passing, we uncover an...