A5079778788- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Distributed and Parallel Computing Systems
- International Science and Diplomacy
- Quantum chaos and dynamical systems
- Relativity and Gravitational Theory
- Quantum Electrodynamics and Casimir Effect
- Cold Atom Physics and Bose-Einstein Condensates
- Physics of Superconductivity and Magnetism
- Noncommutative and Quantum Gravity Theories
- Theoretical and Computational Physics
- Quantum, superfluid, helium dynamics
- Spectral Theory in Mathematical Physics
- Algebraic and Geometric Analysis
- Medical Imaging Techniques and Applications
Universidade de São Paulo
2016-2025
Universitat de Barcelona
2023
Heidelberg University
2021
ARC Centre of Excellence for Particle Physics at the Terascale
2016-2017
The University of Melbourne
2016-2017
Stony Brook University
2013
CEA Paris-Saclay
2012
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012
Institut de Physique Théorique
2012
Universidade Estadual Paulista (Unesp)
1986-2009
We study the indirect effects of new physics on phenomenology recently discovered ``Higgs-like'' particle. In a model-independent framework these can be parametrized in terms an effective Lagrangian at electroweak scale. theory which $SU(2{)}_{L}\ifmmode\times\else\texttimes\fi{}U(1{)}_{Y}$ gauge symmetry is linearly realized they appear lowest order as dimension-six operators, containing all standard model fields including light scalar doublet, with unknown coefficients. discuss choice...
The recently announced Higgs boson discovery marks the dawn of direct probing electroweak symmetry breaking sector. Sorting out dynamics responsible for now requires interactions and searching additional states connected to this In work, we analyze constraints on couplings standard model gauge bosons using available data from Tevatron LHC. We work in a model-independent framework expressing departure by dimension-six operators. This allows independent modifications its gluons, photons, weak...
The pattern of deviations from Standard Model predictions and couplings is different for theories new physics based on a non-linear realization the SU(2)L × U(1)Y gauge symmetry breaking those assuming linear realization. We clarify this issue in model-independent way via its effective Lagrangian formulation presence light Higgs particle, up to first order expansions: dimension-six operators expansion four derivatives one. Complete sets gauge-Higgs are considered, implementing...
Based on Run I data we present a comprehensive analysis of Higgs couplings. For the first time this SFitter includes independent tests Higgs-gluon and top Yukawa couplings, decays to invisible particles, off-shell measurements. The observed boson is fully consistent with Standard Model, both in terms coupling modifications effective field theory. only total rates results using approaches are essentially equivalent, exception strong correlations parameter space induced by operators. These can...
The effective Lagrangian expansion provides a framework to study effects of new physics at the electroweak scale. To make full use LHC data in constraining higher-dimensional operators we need include both Higgs and gauge sector our study. We first present an analysis relevant di-boson production results update constraints on triple boson couplings. Our bounds are several times stronger than those obtained from LEP data. Next, show how combination with measurements vertices lead significant...
We perform a comprehensive study of the Higgs couplings, gauge boson couplings to fermions, and triple vertices. work in framework effective theories including effects dimension-six operators contributing these observables. determine presently allowed range for coefficients via 20 parameter global fit electroweak precision data, as well diboson production data from LHC runs 1 2. quantify improvement on determination Wilson by inclusion run 2 results. In particular, we present novel analysis...
We present a comprehensive study of the electroweak interactions using available Higgs and diboson production results from LHC runs 1 2 as well precision data in terms dimension-six operators. Under assumption that no new tree-level sources flavor violation or universality weak current are introduced, analysis involves 21 assess impact on kinematic distributions for at by comparing obtained including simplified template cross-section with those which only total signal strengths considered....
We analyze the potential of CERN Large Hadron Collider (LHC) to study structure quartic vector-boson interactions through pair production electroweak gauge bosons via weak boson fusion $qq\ensuremath{\rightarrow}qqWW$. In order these couplings we have performed a partonic level calculation all processes $pp\ensuremath{\rightarrow}jj{e}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\nu}\ensuremath{\nu}$ and...
The isoentropic, but energy-nonconserving, time evolution of mixed quantum states is studied in mechanics and field theory. A variational principle, which gives the Liouville--von Neumann equation, implemented approximately by making a Gaussian Ansatz for density matrix. dynamical equations governing parameters that define satisfy variously analogous to Schr\"odinger equation mechanical problems. Interesting nonequilibrium found special cases, as, example, when analog rise reflectionless...
In the framework of effective Lagrangians with SU(2)(L)×U(1)(Y) symmetry linearly realized, modifications couplings Higgs field to electroweak gauge bosons are related anomalous triple (TGCs). Here, we show that analysis latest boson production data at LHC and Tevatron give rise strong bounds on TGCs complementary those from direct TGC analysis. We present constraints obtained by combining all available studies
The larger center-of-mass energy of the Large Hadron Collider Run 2 opens up possibility a more detailed study quartic vertices electroweak gauge bosons. Our goal in this work is to classify all operators possessing interactions among bosons that do not exhibit triple gauge-boson associated them. We obtain relevant nonlinear and linear realizations $SU(2{)}_{L}\ensuremath{\bigotimes}U(1{)}_{Y}$ symmetry.
We perform a complete study of the electroweak precision observables and gauge boson pair production in terms Standard Model effective field theory up to $\mathcal{O}(1/{\mathrm{\ensuremath{\Lambda}}}^{4})$ under assumption universal $C$ $P$ conserving new physics. show that analysis data from those two sectors allows us obtain closed constraints relevant parameter space this scenario. In particular, we find Large Hadron Collider can independently constrain Wilson coefficients dimension-six...
We analyze the scattering of fermions, Higgs and electroweak gauge bosons in order to obtain partial-wave unitarity bounds on dimension-six effective operators, including those involving fermions. also quantify whether, at LHC energies, operators lead violation after taking into account presently available constraints their Wilson coefficients. Our results show that for most relevant physics there is no consequently, need introduction form factors experimental phenomenological analyses,...
With the discovery of Higgs boson, spectrum particles in Standard Model (SM) is complete. It more important than ever to perform precision measurements and test for deviations from SM predictions electroweak sector. In this report, we investigate two themes arena measurements: observables (EWPOs) that particle content couplings minimal supersymmetric SM, involving multiple gauge bosons final state which provide unique probes basic tenets symmetry breaking. Among EWPOs focus our discussion on...
We obtain the partial-wave unitarity constraints on dimension-six operators stemming from analyses of vector boson and Higgs scattering processes as well inelastic standard model fermions into electroweak gauge bosons. take account all coupled channels, possible helicity amplitudes, explore a six-dimensional parameter space anomalous couplings. Our analysis shows that for those affecting couplings, present 90% confidence level global data are such is not violated if...
We obtain the partial-wave unitarity constraints on lowest-dimension effective operators which generate anomalous quartic gauge couplings but leave triple unaffected. consider operator expansions with linear and nonlinear realizations of electroweak symmetry explore multidimensional parameter space coefficients relevant operators: 18 dimension-eight in expansion 5 $\mathcal{O}({p}^{4})$ derivative expansion. study two-to-two scattering bosons Higgs bosons, taking into account all coupled...
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.
We study Drell-Yan production in universal theories consistently including effects beyond dimension six the SMEFT. Within SMEFT and with $C$ $P$ conservation we find that eleven dimension-eight operators contribute addition to contributing at dimension-six. first work an operator basis which higher derivatives of bosonic fields have been rotated by equations motion favor combinations involving SM fermion currents. derive general form amplitudes expansion ${\cal O}(\Lambda^{-4})$ identify...
We present an analysis of the discovery reach for supersymmetric particles at upgraded Tevatron collider, assuming that SUSY breaking results in universal soft parameters grand unification scale, and lightest particle is stable neutral. first a review literature, including issues unification, renormalization group evolution supersymmetry effect radiative corrections on effective low energy couplings masses theory. consider experimental bounds coming from direct searches those arising...