A5054415795- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Pulsars and Gravitational Waves Research
- Distributed and Parallel Computing Systems
- Quantum Electrodynamics and Casimir Effect
- Magnetic confinement fusion research
- Noncommutative and Quantum Gravity Theories
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Advanced Thermodynamics and Statistical Mechanics
- Particle Accelerators and Free-Electron Lasers
- Tribology and Lubrication Engineering
- Nuclear physics research studies
- Hydrology and Drought Analysis
- Advanced Measurement and Metrology Techniques
- Cold Atom Physics and Bose-Einstein Condensates
- Climate variability and models
- Particle accelerators and beam dynamics
- Optical measurement and interference techniques
- Dark Matter and Cosmic Phenomena
- Complex Systems and Time Series Analysis
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2008-2024
University of Florence
2007-2022
Istituto Nazionale di Fisica Nucleare
2012-2021
Deutsches Elektronen-Synchrotron DESY
2010-2011
National Centre for Nuclear Research
2010
École Polytechnique
2010
Centre National de la Recherche Scientifique
2010
Université Paris-Sud
2010
Sorbonne Université
2010
Florence (Netherlands)
2005-2010
We propose and analyze an improved small-x equation which incorporates exact leading next-to-leading BFKL kernels on one hand renormalization group constraints in the relevant collinear limits other. work out detail recently proposed omega-expansion of solution, derive Green's function factorization properties discuss both gluon anomalous dimension hard pomeron. The resummed results are stable, nearly renormalization-scheme independent, join smoothly with fixed order perturbative regime. Two...
We calculate cross section and azimuthal decorrellation of Mueller Navelet jets at the LHC in complete next-lo-leading order BFKL framework, i.e. including next-to-leading corrections to Green's function as well vertices. The obtained results for standard observables proposed studies show that both sources are equal, big importance final magnitude behavior observables. astonishing conclusion our analysis is within framework present paper quite similar same DGLAP type treatment. This fact...
Following a semi-classical eikonal approach --- justified at transplanckian energies order by in the deflection angle $\Theta_s\sim\frac{4G\sqrt{s}}{b} \equiv \frac{2 R}{b}$ we investigate infrared features of gravitational scattering and radiation four space-time dimensions, illustrate factorization cancellation infinite Coulomb phase for resummation radiation. As consequence, both $2\delta(E,b)$ gravitational-wave (GW) spectrum $\frac{\mathrm{d}E^{GW}}{\mathrm{d}\omega}$ are free from...
We investigate the basic features of gluon density predicted by a renormalization group improved small-$x$ equation which incorporates both splitting function at leading collinear level and exact Balitskii-Fadin-Kuraev-Lipatov (BFKL) kernel next-to-leading level. provide resummed results for Green's its hard Pomeron exponent ${\ensuremath{\omega}}_{s}({\ensuremath{\alpha}}_{s}),$ critical ${\ensuremath{\omega}}_{c}({\ensuremath{\alpha}}_{s}).$ find that nonlinear resummation effects...
We derive the limiting form of graviton radiation in gravitational scattering at transplanckian energies ($E\gg M_P$) and small deflection angles. show that --- owing to graviton's spin 2 such unifies soft- Regge- regimes emission, by covering a broad angular range, from forward fragmentation deeply central region. The single-exchange emission amplitudes have nice expression terms transformation phases helicity under rotations. As result, multiple-exchange can be resummed via an impact...
We consider the radiation of three soft gluons in a generic process for multiparton hard scattering QCD. In limit corresponding amplitude has singular behaviour that is factorized and controlled by colorful current. compute tree-level current triple soft-gluon emission from both massless massive partons. The three-gluon expressed terms maximally non-abelian irreducible correlations. squared amplitudes colour correlations produced one two leads to dipole Triple produces addition quadrupole...
In this third part of our calculation the QCD NLO corrections to photon impact factor we combine previous results for real with singular pieces virtual and present finite analytic expressions quark-antiquark-gluon intermediate state inside factor. We begin a list infrared correction, obtained in first step program. then complete (longitudinal transverse polarization). next define, corrections, collinear soft regions calculate their contributions subtract contribution due central region....
The HERA electron--proton collider has collected 100 pb$^{-1}$ of data since its start-up in 1992, and recently moved into a high-luminosity operation mode, with upgraded detectors, aiming to increase the total integrated luminosity per experiment more than 500 pb$^{-1}$. been machine excellence for study QCD structure proton. Large Hadron Collider (LHC), which will collide protons centre-of-mass energy 14 TeV, be completed at CERN 2007. main mission LHC is discover mechanisms electroweak...
We consider the radiation of a soft gluon ($g$) and quark-antiquark ($q{\bar q}$) pair in QCD hard scattering. In limit scattering amplitude has singular behaviour that is factorized controlled by current, which process-independent structure colour space. evaluate $gq{\bar q}$ current at tree level for an arbitrary multiparton process. The irreducible correlation component includes strictly non-abelian terms also with abelian character. Analogous correlations appear photon-lepton-antilepton...
It is widely believed that at small x, the BFKL resummed gluon splitting function should grow as a power of 1/x. But in several recent calculations it has been found to decrease for moderately small-x before eventually rising. We show this ‘dip’ structure rigorous feature Pgg sufficiently αs, minimum occurring formally log(1/x)∼1/αs. calculate properties dip, including corrections relative order and discuss how expansion powers which poorly convergent, can be qualitatively matched fully...
Starting from the ACV approach to transplanckian scattering, we present a development of reduced-action model in which (improved) eikonal representation is able describe particles' motion at large scattering angle and, furthermore, UV-safe (regular) rescattering solutions are found and incorporated metric. The resulting shock-waves undergo calculable trajectory shifts time delays during process — turns out be consistently described by both action metric, up relative order R 2 /b...
We argue that, as a consequence of the graviton's spin-2, its bremsstrahlung in trans-Planckian-energy (E≫M(P)) gravitational scattering at small deflection angle can be nicely expressed terms helicity-transformation phases and their transfer within process. The resulting spectrum exhibits deeply sub-Planckian characteristic energies order M(P)(2)/E≪M(P) (reminiscent Hawking radiation), suppressed fragmentation region, reduced rapidity plateau, broad agreement with recent classical estimates.
2nd workshop on the implications of HERA for LHC physics. Working groups: Parton Density Functions Multi-jet final states and energy flows Heavy quarks (charm beauty) Diffraction Cosmic Rays Monte Carlos Tools
We investigate the relation between subleading soft graviton theorem and asymptotic symmetries in gravity even dimensions $d=2+2m$ higher than four. After rewriting as a Ward identity, we argue that charges of such identity generate $\mathrm{Diff}({S}^{2m})$. In order to show that, propose suitable commutation among certain components metric fields. As result, all $\mathrm{Diff}({S}^{2m})$ transformations are gravitational scattering.
We study QCD hard processes at scales of order ${\mathbf{k}}^{2}\ensuremath{\gg}{\ensuremath{\Lambda}}^{2}$ in the limit which beta-function coefficient b is taken to be small, but ${\overline{\ensuremath{\alpha}}}_{s}({\mathbf{k}}^{2})$ kept fixed. The (nonperturbative) Pomeron exponentially suppressed this limit, making it possible define purely perturbative high-energy Green's functions. exponent acquires diffusion and running coupling corrections can expanded parameter turn out dependent...
We provide an assessment of the impact parton distributions on determination LHC processes, and accuracy with which (PDFs) can be extracted from data, in particular current forthcoming HERA experiments. give overview reference processes their associated PDF uncertainties, study detail W Z production at LHC. discuss precision may obtained analysis existing tests consistency data different experiments, combination these data. determine further improvements PDFs future (including measurements...
For the first time, a next-to-leading BFKL study of cross s ection and azimuthal decorrellation Mueller Navelet jets is performed, i.e. including next-t o-leading corrections to Green’s function as well vertices. The obtained results for standard observables proposed studies show that both sources are equal big importance final magni tude behavior observables, in particular LHC kinematics investigated here detail. astonishing conclusion our analysis within c omplete next-lo-leading order...