A5007848920- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
- Scientific Research and Discoveries
- Superconducting Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Quantum, superfluid, helium dynamics
- Quantum Electrodynamics and Casimir Effect
- Electron and X-Ray Spectroscopy Techniques
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Crystallography and Radiation Phenomena
- Advanced MRI Techniques and Applications
- Cinema and Media Studies
- Particle accelerators and beam dynamics
Florida International University
2010-2024
Argonne National Laboratory
2022-2024
Campbell Collaboration
2023
Ghent University
2014-2023
University of Miami
2023
Centre National de la Recherche Scientifique
2019
National Centre for Nuclear Research
2019
École Polytechnique
2019
Thomas Jefferson National Accelerator Facility
2019
Japan Proton Accelerator Research Complex
2017
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.
We provide the complete decomposition of local gauge-invariant energy-momentum tensor for spin-1 hadrons, including non-conserved terms individual parton flavors and antisymmetric contributions originating from intrinsic spin. state sum rules gravitational form factors appearing in this relations mass decomposition, work balance, total orbital angular momentum, radius, inertia tensor. Generalizing earlier work, we derive between momentum Mellin moments twist-2 3 generalized distributions,...
We have measured the nuclear transparency of A(e,e′π+) process in H2, C12, Al27, Cu63, and Au197 targets. These measurements were performed at Jefferson Laboratory over a four momentum transfer squared range Q2=1.1 to 4.7 (GeV/c)2. The was extracted as super-ratio (σA/σH) from data model pion-electroproduction nuclei without π−N final-state interactions. Q2 atomic number dependence both show deviations traditional physics expectations are consistent with calculations that include quantum...
The nuclear mass dependence of the number short-range correlated (SRC) proton-proton (pp) and proton-neutron (pn) pairs in nuclei is a sensitive probe dynamics ground state atomic nuclei. This work presents an analysis electroinduced single-proton two-proton knockout measurements off 12C, 27Al, 56Fe, 208Pb kinematics dominated by scattering SRC pairs. observed A(e,e'pp)/12C(e,e'pp) cross-section ratios extracted pp- pn-SRC are much softer than total possible agreement with physical picture...
The fundamental theory of the strong interaction-quantum chromodynamics (QCD)—provides foundational framework with which to describe and understand key properties atomic nuclei. A deep understanding explicit role quarks gluons in nuclei remains elusive however, as these effects have thus far been well-disguised by confinement QCD are encapsulated a successful description terms effective hadronic degrees freedom. observation EMC effect has provided an enduring indication for nuclei, points...
We outline the physics opportunities provided by Electron Ion Collider (EIC). These include study of parton structure nucleon and nuclei, onset gluon saturation, production jets heavy flavor, hadron spectroscopy tests fundamental symmetries. review present status future challenges in EIC theory that have to be addressed order realize this ambitious impactful program, including how engage a diverse inclusive workforce. In address these many-fold challenges, we propose coordinated effort...
Background: Short-range correlations (SRC) are an important ingredient of the dynamics nuclei.Purpose: An approximate method to quantify magnitude two-nucleon (2N) and three-nucleon (3N) short-range their mass dependence is proposed.Method: The proposed relies on concept ``universality'' or ``local nuclear character'' SRC. We SRC by computing number independent-particle model (IPM) nucleon pairs triples which reveal beyond-mean-field behavior. It argued that those can be identified counting...
Tensor-polarized structure functions of a spin-1 hadron are additional observables, which do not exist for the spin-$1/2$ nucleon. They could probe novel aspects internal structure. Twist-2 tensor-polarized ${b}_{1}$ and ${b}_{2}$, they related by Callan-Gross-like relation in Bjorken scaling limit. In this work, we theoretically calculate standard convolution description deuteron. Two different theoretical models, basic virtual nucleon approximation, used calculating ${b}_{1}$, their...
We investigate the factorization properties of exclusive electroinduced two-nucleon knockout reaction $A(e,{e}^{\ensuremath{'}}pN)$. A factorized expression for cross section is derived and conditions are studied. The $A(e,{e}^{\ensuremath{'}}pN)$ shown to be proportional conditional center-of-mass (c.m.) momentum distribution close-proximity pairs in a state with zero relative orbital radial quantum number. width this c.m. larger than one corresponding full distribution. It that final-state...
Transversity generalized parton distributions (GPDs) appear as scalar functions in the decomposition of off-forward quark-quark and gluon-gluon correlators with a helicity flip. For spin 1 hadron, we find nine transversity GPDs for both quarks gluons at leading twist 2. We study these twist-2 chiral odd quark deuteron light cone convolution model, based on impulse approximation, using lowest Fock-space state deuteron.
Semi-inclusive deep inelastic scattering off the Deuteron with production of a slow nucleon in recoil kinematics is studied virtual approximation, which final state interaction (FSI) calculated within general eikonal approximation. The cross section derived factorized approach, factor describing photon off-shell and distorted spectral function accounting for final-state interactions. One main goals study to understand how much features diffractive high energy soft rescattering accounts...
Nuclear short-range correlations (SRC) typically manifest themselves in the tail parts of single-nucleon momentum distributions. We propose an approximate practical method for computing those SRC contributions to high-momentum parts. The framework adopted this work is applicable throughout nuclear mass table and corrects mean-field models central, spin–isospin tensor by shifting complexity induced from wave functions operators. It argued that expansion these modified operators can be...
A relativistic and quantum mechanical framework to compute nuclear transparencies for pion photo- electroproduction reactions is presented. Final-state interactions the ejected pions nucleons are implemented in a eikonal approach. At sufficiently large ejectile energies, Glauber model can be adopted. lower possesses flexibility use optical potentials. The proposed account color-transparency (CT) phenomenon short-range correlations (SRC) nucleus. Results presented kinematics corresponding...
We report on a calculation of cross sections for charged-current quasielastic antineutrino scattering off ${}^{12}$C in the energy range interest MiniBooNE experiment. adopt impulse approximation (IA) and use nonrelativistic continuum random phase (CRPA) to model nuclear dynamics. An effective nucleon-nucleon interaction Skyrme type is used. compare our results with recent cross-section data confront them alternate calculations. The CRPA predictions reproduce gross features shape measured...
Background: Exclusive two-nucleon knockout after electroexcitation of nuclei $[A(e,{e}^{\ensuremath{'}}NN)$ in brief] is considered to be a primary source information about short-range correlations (SRCs) nuclei. For proper interpretation the data, final-state interactions (FSIs) need theoretically controlled.Purpose: Our goal quantify role FSI effects exclusive $A(e,{e}^{\ensuremath{'}}pN)$ reactions for four target representative whole mass region. focus on processes that are SRC driven....
We provide a systematic study of the isospin composition and neutron-to-proton (NZ) ratio dependence nuclear short-range correlations (SRC) across mass table. use low-order correlation operator approximation (LCA) to compute SRC contribution single-nucleon momentum distributions for 14 different nuclei from A=4 A=208. Ten asymmetric are included which neutrons outnumber protons by factor up 1.54. The computed used extract pair SRC. find that there is comprehensive picture their evolution...
Background: DIS on the polarized deuteron with detection of a proton in nuclear breakup region (spectator tagging) represents unique method for extracting neutron spin structure functions and studying modifications. The tagged momentum controls configuration during process enables differential analysis effects. Such measurements could be performed future electron-ion collider (EIC) forward detectors if beam polarization achieved. Purpose: Develop theoretical framework spectator tagging....
Densities associated with the energy-momentum tensor are calculated for spin-one targets. These calculations done in a light front formalism, which accounts relativistic effects due to boosts and allows arbitrary spatial localization of target. densities include distribution momentum, angular pressures over two-dimensional plane transverse front. Results obtained both longitudinally transversely polarized targets, formalism is tailored allow possibility massless The momentum density pressure...
We propose to study the onset of color transparency in hard exclusive reactions backward regime. Guided by encouraging JLab results on pion and omega electro-production data at moderate Q^2, which may be interpreted as signal an early scaling regime where scattering amplitude factorizes a coefficient function convoluted with nucleon meson transition distribution amplitudes, we show that these channels nuclear targets opens new opportunity test appearance for fast moving nucleon.
We suggest that the number of correlated nucleon pairs in an arbitrary nucleus can be estimated by counting proton-neutron, proton-proton, and neutron-neutron residing a relative $S$ state. present numerical calculations those amounts for nuclei $^{4}$He, $^{9}$Be, $ ^{12}$C, ^{27}$Al, ^{40}$Ca, ^{48}$Ca, ^{56}$Fe, ^{63}$Cu, ^{108}$Ag, ^{197}$Au. The results are used to predict values ratios per-nucleon electron-nucleus inelastic scattering cross section deuteron kinematic regime where...
Background: High-momentum nucleons in a nuclear environment can be associated with short-range correlations (SRC) that primarily occur between nucleon pairs. Observations and theoretical developments have indicated the SRC properties captured by general quantitative principles are subject to model dependence upon quantification. The variations aggregated effect of across nuclei, however, quantified an approximately model-independent fashion terms so-called scaling factors capture for...