A5059433147- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Quantum Mechanics and Applications
- Noncommutative and Quantum Gravity Theories
- Quantum chaos and dynamical systems
- Dark Matter and Cosmic Phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Spectral Theory in Mathematical Physics
- Quantum and Classical Electrodynamics
- Computational Physics and Python Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Relativity and Gravitational Theory
- Molecular spectroscopy and chirality
- Scientific Research and Discoveries
- Algebraic structures and combinatorial models
- Physics of Superconductivity and Magnetism
- Spectroscopy and Quantum Chemical Studies
- Medical Imaging Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Experimental and Theoretical Physics Studies
- Phase Equilibria and Thermodynamics
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2007-2023
Sapienza University of Rome
1999-2019
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2001-2019
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2019
Enrico Fermi Center for Study and Research
2019
Karlsruhe Institute of Technology
2007
Centre de Physique Théorique
1980-2006
European Organization for Nuclear Research
1972-1998
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
1998
Istituto Nazionale di Fisica Nucleare
1984-1993
We show that a recent interesting idea to circumvent the difficulties with continuation of parton distribution functions Euclidean region, which consists in looking at equal time correlators between proton states infinite momentum, encounters some problems related power divergent mixing pattern deep inelastic scattering operators, when implemented within lattice regularization.
We show that, if the formula for topological charge density operator suggested by use of fermions obeying Ginsparg–Wilson relation is employed, it possible to give a precise and unambiguous definition susceptibility in full QCD, χfulltL, finite quark masses on lattice. The lattice expression χfulltL looks like formal continuum one, sense that no power divergent subtractions are needed its proper definition. As consequence, small mass behaviour leads directly multiplicative renormalizable...
In this note we reexamine the possibility of extracting parton distribution functions from lattice simulations. We discuss case quasi-parton functions, using reduced Ioffe-time distributions and more recent proposal directly making reference to computation current-current $T$-product. show that in all cases process renormalization hindered by momenta limitation represents an obstruction a direct Euclidean calculation function.
The short-time behavior of an unstable particle is examined in a realistic field theoretical model. onset linear decreasing the nondecay probability shown to be extremely rapid, so rapid as exclude any relevance regimes quadratic time (``Zeno'' quantum paradox). result applies super-renormalizable, renormalizable, and nonrenormalizable cases, particularly proton decay problem. We discuss also deviations from exponential law small-Q-value decays.
We prove that conservation of the stress tensor is a consequence invariance partition function under canonical diffeomorphisms. From this observation simple and general derivation formula which gives local expression molecular system in terms its microscopic degrees freedom readily follows. The valid as well microcanonical ensemble. It works both classical quantum mechanical settings for arbitrary boundary conditions. In particular, if periodic conditions are assigned to system, usual...
We consider a local formalism in quantum field theory, which no reference is made to infinitely extended spacial surfaces, infinite past or future. This can be obtained terms of functional W[f,S] the f on closed 3d surface S that bounds finite region R Minkowski spacetime. The dependence W governed by covariant generalization Schroedinger equation. Particles' scattering amplitudes describe experiments conducted --the lab during time-- expressed W. geometry expresses transition relative...
Using elementary considerations of Lorentz invariance, Bose symmetry and BRST we argue why the decay a massive color-octet vector state into pair on-shell massless gluons is possible in non-Abelian SU(N) Yang–Mills theory, constrain form amplitude process offer simple understanding these results terms effective-action operators.