Alessandro Bacchetta
A5025191314- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- Quantum Mechanics and Applications
- Dark Matter and Cosmic Phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Distributed and Parallel Computing Systems
- Molecular spectroscopy and chirality
- Semiconductor Quantum Structures and Devices
- Scientific Computing and Data Management
- Medical Imaging Techniques and Applications
- Quantum and Classical Electrodynamics
- Crystallography and Radiation Phenomena
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Algebraic and Geometric Analysis
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
2015-2024
University of Pavia
2015-2024
Universidad de Alcalá
2024
Istituto Nazionale di Fisica Nucleare
2022
Argonne National Laboratory
2019-2022
Institut de Recherche sur les Lois Fondamentales de l'Univers
2022
CEA Paris-Saclay
2022
Université Paris-Saclay
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
Institute for Physics
2022
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering positrons are measured the first time with transverse target polarization. The asymmetry depends on azimuthal angles both pion ($\ensuremath{\phi}$) and spin axis (${\ensuremath{\phi}}_{S}$) about virtual-photon direction relative to lepton plane. extracted Fourier component $\mathbf{⟨}\mathrm{sin}(\ensuremath{\phi}+{\ensuremath{\phi}}_{S}){\mathbf{⟩}}_{UT}^{\ensuremath{\pi}}$ is a...
Azimuthal single-spin asymmetries of lepto-produced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from non-vanishing Sivers effects pi+, pi0, K+, K-, as well in the difference pi+ pi- cross sections.
This report is based on a ten-week program Gluons and the quark sea at high-energies, which took place Institute for Nuclear Theory (INT) in Seattle Fall 2010. The principal aim of was to develop sharpen science case an Electron-Ion Collider (EIC), facility that will be able collide electrons positrons with polarized protons light heavy nuclei high energies, offering unprecedented possibilities in-depth studies quantum chromodynamics (QCD). organized around following four major themes: (i)...
We provide a concise overview on transverse momentum dependent (TMD) parton distribution functions, their application to topical issues in high-energy physics phenomenology, and theoretical connections with QCD resummation, evolution factorization theorems. illustrate the use of TMDs via examples multi-scale problems hadronic collisions. These include q_T spectra Higgs vector bosons for low q_T, azimuthal correlations production multiple jets associated heavy at large jet masses. discuss...
Abstract High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along beam collision axis, outside acceptance existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from ATLAS interaction point and shielded by concrete rock, will host suite experiments probe standard model (SM) processes search for physics beyond (BSM). In this report, we review status civil engineering plans explore...
We present an extraction of unpolarized transverse-momentum-dependent parton distribution and fragmentation functions based on more than two thousands data points from several experiments for different processes: semi-inclusive deep-inelastic scattering Drell-Yan production lepton pairs. The baseline analysis is performed with a Monte Carlo replica method resumming large logarithms at N3LL accuracy. resulting description the very good ($\chi^2/N_{\rm dat} = 1.06$). For scattering,...
During the workshop ``Transversity: New Developments in Nucleon Spin Structure'' (${\mathrm{E}\mathrm{C}\mathrm{T}}^{*}$, Trento, Italy, 14--18 June 2004), a series of recommendations was put forward by participants concerning definitions and notations for describing effects intrinsic transverse-momentum partons semi-inclusive deep inelastic scattering.
All the leading-twist parton distribution functions are calculated in a spectator model of nucleon, using scalar and axial-vector diquarks. Single gluon rescattering is used to generate $T$-odd functions. Different choices for diquark polarization states considered, as well few options form factor at nucleon-quark-diquark vertex. The results listed analytic interpreted terms light-cone wave parameters fixed by reproducing phenomenological parametrization unpolarized helicity distributions...
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons electrons off a transversely nuclear-polarized hydrogen target. The dependence the cross section on azimuthal angles target polarization (phi_S)and produced hadron (phi) is found to have substantial sin(phi+phi_S) modulation production pi+, pi- K+. This Fourier component can be interpreted terms non-zero transversity distribution functions favored disfavored Collins...
A bstract We present an extraction of unpolarized partonic transverse momentum distributions (TMDs) from a simultaneous fit available data measured in semi-inclusive deep-inelastic scattering, Drell-Yan and Z boson production. To connect at different scales, we use TMD evolution next-to-leading logarithmic accuracy. The analysis is restricted to the low-transverse-momentum region, with no matching fixed-order calculations high momentum. introduce specific choices deal low order 1 GeV 2 ....
We present an updated extraction of the transversity parton distribution based on analysis pion-pair production in deep-inelastic scattering off transversely polarized targets collinear factorization. Data for proton and deuteron make it possible to perform a flavor separation valence components distribution, using di-hadron fragmentation functions taken from semi-inclusive two pion pairs back-to-back jets e + − annihilation. The data Belle have been reanalyzed replica method more realistic...
We present the first extraction of transversity distribution in framework collinear factorization based on global analysis pion-pair production deep-inelastic scattering and proton-proton collisions with a transversely polarized proton. The relies knowledge dihadron fragmentation functions, which are taken from electron-positron annihilation data. For time, is extracted similar to what usually done for spin-averaged helicity distributions. important for, among other things, detecting...
A common library, TMDlib2, for Transverse-Momentum-Dependent distributions (TMDs) and unintegrated parton (uPDFs) is described, which allows easy access of commonly used TMDs uPDFs, providing a three-dimensional (3D) picture the partonic structure hadrons. The tool TMDplotter web-based plotting implemented in together with collinear pdfs as available LHAPDF.