A5044630437- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Reservoir Engineering and Simulation Methods
- Pulsars and Gravitational Waves Research
- Atomic and Molecular Physics
- Cold Fusion and Nuclear Reactions
- Cosmology and Gravitation Theories
- Advanced NMR Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Crystallography and Radiation Phenomena
- High-pressure geophysics and materials
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- Medical Imaging Techniques and Applications
Pennsylvania State University
2015-2024
Norfolk State University
2023
SLAC National Accelerator Laboratory
2022
Brookhaven National Laboratory
1998-2020
Research Institute for Geo-Hydrological Protection
2019
Park University
2012-2014
Stony Brook University
2013
Thomas Jefferson National Accelerator Facility
2009
Ruhr University Bochum
2007
Pacific States University
2006
We formulate and prove a QCD factorization theorem for hard exclusive electroproduction of mesons in QCD. The proof is valid the leading power $Q$ all logarithms. This generalizes previous work on vector meson production diffractive region small $x.$ amplitude expressed terms off-diagonal generalizations usual parton densities. full applies to kinds not just mesons. densities used include only ordinary density, but also helicity density (${g}_{1}$ or $\ensuremath{\Delta}q$) transversity...
We demonstrate that the distinctive features of forward differential cross section diffractive leptoproduction a vector meson can be legitimately calculated in perturbative QCD terms light-cone qq\ifmmode\bar\else\textasciimacron\fi{} wave function and gluon distribution target. In particular, we calculate ${\mathit{Q}}^{2}$ nuclear dependence mesons estimate section. The production longitudinally polarized by virtual photons is predicted to dominant component, yielding behaving as...
The ratios of inclusive electron scattering cross sections 4He, 12C, and 56Fe to 3He have been measured at 1<xB<3. At Q2>1.4 GeV2, the exhibit two separate plateaus, 1.5<xB<2 xB>2.25. This pattern is predicted by models that include 2- 3-nucleon short-range correlations (SRC). Relative A=3, per-nucleon probabilities SRC are 2.3, 3.1, 4.4 times larger for A=4, 12, 56. first measurement in nuclei.Received 16 August 2005DOI:https://doi.org/10.1103/PhysRevLett.96.082501©2006 American Physical Society
We analyze recent data from high-momentum-transfer (p, pp) and ppn) reactions on carbon. For this analysis, the two-nucleon short-range correlation (NN-SRC) model for backward nucleon emission is extended to include motion of NN pair in mean field. The found describe major characteristics data. Our analysis demonstrates that removal a proton nucleus with initial momentum 275-550 MeV/c 92(+8/-18) % time accompanied by correlated neutron carries roughly equal opposite momentum. This indicates...
According to perturbative QCD, nuclear quasiexclusive reactions should be $\ensuremath{\propto}{A}^{1}$ at asymptotically large momentum transfer. Here we analyze how the asymptotic prediction is modified finite energies by expansion of quark systems as they become hadrons and exit from nucleus. We find that phenomenon transparency apparent in presently fesible experiments, but degree sensitive model.
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...
We argue that the ratio of cross sections quasielastic electron scattering for heavy and light nuclei at x>1 ${\mathit{Q}}^{2}$>1 (GeV/c${)}^{2}$ should exhibit simple scaling relations which are ultimately expressed through light-cone nucleon distributions in nuclei. extract these section ratios from existing data a practically model independent way. The results found to be reasonable agreement with our x-scaling region 2>x\ensuremath{\ge}1.4 where contribution two-nucleon...
Proton–nucleus (p+A) collisions have long been recognized as a crucial component of the physics program with nuclear beams at high energies, in particular for their reference role to interpret and understand nucleus–nucleus data well potential elucidate partonic structure matter low parton fractional momenta (small-x). Here, we summarize main motivations that make proton–nucleus run decisive ingredient successful heavy-ion Large Hadron Collider (LHC) present unique scientific opportunities...
We demonstrate that in the back-to-back kinematics production of four jets collision two partons is suppressed leading log approximation pQCD, compared to \^Ehard processes involving partons. derive basic equation for four-jet QCD terms convolution generalized two-parton distributions colliding hadrons momentum space representation. Our derivation leads geometrical approach impact parameter close suggested within parton model and used before describe production. develop independent...
Hard diffractive electroproduction of longitudinally polarized vector mesons is calculated within the leading ${\ensuremath{\alpha}}_{s}\mathrm{ln}(\frac{{Q}^{2}}{{\ensuremath{\Lambda}}_{\mathrm{QCD}}^{2}})$ approximation QCD using order parton densities nucleon. Novel features production excited states and restoration flavor symmetry are analyzed. At onset asymptotic regime, our analysis finds an important role quark Fermi motion diffractively produced mesons, we suggest to use this effect...
We examine the role played in double-parton interactions (DPI) by parton–parton correlations originating from perturbative QCD parton splittings. Also presented are results of numerical analysis integrated DPI cross sections at Tevatron and LHC energies. To obtain knowledge single-parton GPDs gained HERA experiments was used to construct non-perturbative input for generalized distributions. The two-parton induced three-parton contribute significantly a resolution longstanding puzzle an...
Using the data on coherent $J/\psi$ photoproduction in Pb-Pb ultraperipheral collisions (UPCs) obtained Runs 1 and 2 at Large Hadron Collider (LHC), we determined with a good accuracy nuclear suppression factor of $S_{Pb}(x)$ wide range momentum fraction $x$, $10^{-5} \leq x 0.04$. In small-$x$ region $x < 10^{-3}$, our $\chi^2$ fit favors flat form $S_{Pb}(x) \approx 0.6$ approximately 5% for $x=6 \times 10^{-4} - 10^{-3} $ 25% error $x=10^{-4}$. At same time, uncertainties do not exclude...
CONTENTS. 1.Introduction, 1.1 QCD ideas to be tested; 2. Coherence phenomena in QED, 2.1 Charge transparency, 2.2 filtering, 2.3 opacity; 3. Color transparency perturbative QCD, 3.1 length 3.2 Bjorken scaling for deep inelastic processes, 3.3 Hard Coherent Diffraction {}From Nucleons and Nuclei; 4. Soft Diffractive Physics Fluctuations, 4.1 Scattering eigenstates formalism; 4.2 Current information on color fluctuations Hadrons, 4.3 Small Size Configurations Pions, 4.4 Nuclear diffraction as...
Hard diffractive photoproduction and electroproduction of heavy vector mesons ($J/\ensuremath{\psi}$ \ensuremath{\Upsilon}) is evaluated within the leading ${\ensuremath{\alpha}}_{s}\mathrm{ln}{(Q}^{2}/{\ensuremath{\Lambda}}_{\mathrm{QCD}}^{2})$ approximation QCD. Different from our earlier work on that subject, also production transversely polarized calculated. Special emphasis placed role meson's $q\overline{q}$ light-cone wave function. In context, conventional nonrelativistic quarkonium...
The amplitude for hard exclusive pseudoscalar meson electroproduction off nucleon (nuclear) targets is computed in QCD within the leading ${\ensuremath{\alpha}}_{s}\mathrm{ln}{Q}^{2}/{\ensuremath{\Lambda}}_{\mathrm{QCD}}^{2}$ approximation. We show that distribution of recoil nucleons depends strongly on angle between momentum and polarization vector target (or outgoing nucleon). This dependence especially sensitive to spin flip skewed parton (SPD) $\stackrel{\ifmmode \tilde{}\else...
The cross section of hard semiexclusive ${A(e,e}^{\ensuremath{'}}N)(A\ensuremath{-}1)$ reactions for fixed missing energy and momentum is calculated within the eikonal approximation. Relativistic dynamics kinematics high processes are unambiguously accounted by using analysis appropriate Feynman diagrams. A significant dependence final state interactions on found, which important interpretation forthcoming color transparency experiments. new, more stringent kinematic restriction region where...
The scattering of hadrons at high energies can be described by a distribution function cross sections, which incorporates the phenomena color transparency and opacity. We infer here cross-section for pionic projectiles on nucleons consistent with data moments distribution. Using this we calculate probability pion to in pointlike configuration compare predictions based combination perturbative QCD sum rules. Comparison corresponding nucleon-nucleon shows that effects should more pronounced meson beam.