A5049188730- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Advanced NMR Techniques and Applications
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Neutrino Physics Research
- Computational Physics and Python Applications
- Neural Networks and Applications
- Stochastic processes and financial applications
- Particle accelerators and beam dynamics
- Theoretical and Computational Physics
- Magnetic confinement fusion research
- Medical Imaging Techniques and Applications
- Algorithms and Data Compression
- Radioactive Decay and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari
2015-2024
Brookhaven National Laboratory
2024
University of Cagliari
2012-2023
Institut de Recherche sur les Lois Fondamentales de l'Univers
2009-2022
CEA Paris-Saclay
2009-2022
Université Paris-Saclay
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
Istituto Nazionale di Fisica Nucleare
2019-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
1995-2016
University of Turin
2013-2014
We present a global reanalysis of the most recent experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering, from HERMES and COMPASS Collaborations, ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}_{1}{h}_{2}X$ processes, Belle Collaboration. The transversity Collins functions are extracted simultaneously, framework revised analysis which new parametrization is also tested.
This White Paper presents an overview of the current status and future perspective QCD research, based on community inputs scientific conclusions from 2022 Hot Cold Town Meeting. We present progress made in last decade toward a deep understanding both fundamental structure sub-atomic matter nucleon nucleus cold QCD, hot heavy ion collisions. identify key questions research plausible paths to obtaining answers those near future, hence defining priorities our over coming decades.
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.
A global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from HERMES and COMPASS Collaborations, ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}_{1}{h}_{2}X$ processes, Belle Collaboration, is performed. It results extraction Collins fragmentation function and, for first time, transversity distribution $u$ $d$ quarks. These turn out to have opposite signs be sizably smaller than their positivity bounds. Predictions...
The role of intrinsic $\mathbit{k}{\text{ }}_{\ensuremath{\perp}}$ in inclusive and semi-inclusive Deep Inelastic Scattering processes ($\ensuremath{\ell}p\ensuremath{\rightarrow}\ensuremath{\ell}hX$) is studied with exact kinematics within QCD parton model at leading order; the dependence unpolarized cross section on azimuthal angle between leptonic hadron production planes (Cahn effect) compared data used to estimate average values ${k}_{\ensuremath{\perp}}$ both quark distribution...
The relevance of intrinsic (or primordial) transverse momentum partons in the inclusive production particles at high energy and moderately large ${p}_{T}$ has been known for a long time, beginning with Drell-Yan diphoton processes, continuing photon meson hadronic collisions. In view its renewed interest context polarized processes single spin asymmetries we perform, framework perturbative QCD inclusion ${\mathbit{k}}_{\ensuremath{\perp}}$ effects, detailed analysis several such different...
New data from the BABAR Collaboration, on azimuthal asymmetries measured in ${e}^{+}{e}^{\ensuremath{-}}$ annihilations into pion pairs at ${Q}^{2}=112\text{ }\text{ }{\mathrm{GeV}}^{2}$, allow us to take first, direct glance ${p}_{\ensuremath{\perp}}$ dependence of Collins functions, addition their $z$ dependence. These data, together with previous ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}_{1}{h}_{2}$ Belle measurements and available semi-inclusive deep inelastic scattering...
Recent data on the transverse single spin asymmetry A N measured by STAR Collaboration for p ↑ → W ± /Z 0 X reactions at RHIC allow first investigation of Sivers function in Drell-Yan processes and its expected sign change with respect to SIDIS processes. new extraction functions from latest is performed a critical assessment significance attempted.
Within a generalized parton model approach, with inclusion of spin and intrinsic transverse momentum effects, we show how the latest, highly precise, midrapidity data on single asymmetry measured in pp → π 0 X by PHENIX Collaboration at RHIC [1], can be used to get first estimate still poorly known gluon Sivers distribution. To this end also adopt present information quark functions, as extracted from semi-inclusive deeply inelastic scattering data. This analysis updates previous study some...
We present a study of transverse single-spin asymmetries (SSAs) in $p^\uparrow p\to J/\psi\,X$ and D X$ within the framework generalized parton model (GPM), which includes both spin momentum effects, show how they can provide useful information on still almost unknown gluon Sivers function. Moreover, by adopting modified version this model, named color gauge invariant (CGI) GPM, we analyze impact initial- final-state interactions our predictions. As consequence, find that these two processes...
We study the transverse single-spin asymmetries for ${p}^{\ensuremath{\uparrow}}p\ensuremath{\rightarrow}\ensuremath{\pi}X$ and ${p}^{\ensuremath{\uparrow}}p\ensuremath{\rightarrow}\ensuremath{\gamma}X$ within so-called color gauge invariant generalized parton model (CGI-GPM) which, in addition to spin momentum effects, includes initial final state interactions with polarized proton remnants. compute all relevant contributions, focusing particular on process dependence of gluon Sivers...
Electron Ion Collider (EIC) is a particle accelerator facility planned for construction at Brookhaven National Laboratory on Long Island, New York by the United States Department of Energy. EIC will provide capabilities colliding beams polarized electrons with proton and light ions. be one largest most sophisticated new facilities worldwide, only large-scale in next few decades. The versatility, resolving power intensity present many opportunities to address some crucial fundamental open...
The most recent data on the weighted transverse single spin asymmetry ${A}_{UT}^{\mathrm{sin}({\ensuremath{\phi}}_{h}\ensuremath{-}{\ensuremath{\phi}}_{S})}$ from HERMES and COMPASS Collaborations are analyzed within LO parton model with unintegrated distribution fragmentation functions; all motions taken into account, exact kinematics, in elementary interactions. overall quality of is such that, for first time, a rather well constrained extraction Sivers function $u$ $d$ quarks possible...
The high energy and large ${p}_{T}$ inclusive polarized process, $(A,{S}_{A})+(B,{S}_{B})\ensuremath{\rightarrow}C+X$, is considered under the assumption of a generalized QCD factorization scheme. For first time all transverse motions, partons in hadrons fragmenting partons, are explicitly taken into account; elementary interactions computed at leading order with noncollinear exact kinematics, which introduces many phases expressions their helicity amplitudes. Several new spin...
The Sivers distributions recently extracted from semi-inclusive deep inelastic scattering data [M. Anselmino et al., Eur. Phys. J. A 39, 89 (2009)] are used to compute estimates for asymmetries in Drell-Yan processes which being planned at several facilities (RHIC, COMPASS, J-PARC, PAX, PANDA, NICA (JINR) and SPASCHARM (IHEP)). Most of these turn out be large could allow a clear test the predicted sign change when active SIDIS processes. This is regarded as fundamental our understanding,...
The single spin asymmetry A_N, for large P_T inclusive particle production in p(transv. pol.) p collisions, is considered within a generalised parton model and transverse momentum dependent factorisation scheme. focus on the Sivers effect study of its potential contribution to based careful analysis functions extracted from azimuthal asymmetries semi-inclusive deep inelastic scattering processes. It found that such could explain most features A_N data, including some recent STAR results...
The factorization theorems for transverse momentum distributions of dilepton/boson production, recently formulated by Collins and Echevarria-Idilbi-Scimemi in terms well-defined dependent (TMDs), allows a systematic quantitative analysis non-perturbative QCD effects the cross sections involving these quantities. In this paper we perform global fit using all current available data Drell-Yan $Z$-boson production at hadron colliders within framework. perturbative calculable pieces our estimates...
We consider transverse momentum dependent gluon distributions inside both unpolarized and transversely polarized protons show how they can be probed by looking at azimuthal modulations in $e \, p \to e J/ψ\, \mathrm{jet} X$. find that the contribution due to quark induced subprocesses is always suppressed considered kinematic regions, accessible principle a future Electron-Ion Collider. Our model-independent estimates of maximal values these asymmetries allowed positivity bounds suggest...