A5028431093- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Quantum, superfluid, helium dynamics
- Theoretical and Computational Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Stochastic processes and statistical mechanics
- Quantum Electrodynamics and Casimir Effect
- Pulsars and Gravitational Waves Research
- Nuclear reactor physics and engineering
- Fish Biology and Ecology Studies
- Advanced Thermodynamics and Statistical Mechanics
- Agricultural Economics and Practices
- Distributed and Parallel Computing Systems
- Glass properties and applications
- Particle Accelerators and Free-Electron Lasers
- Marine and fisheries research
- Crystallography and Radiation Phenomena
- Computational Physics and Python Applications
- Quantum Mechanics and Applications
- Gamma-ray bursts and supernovae
- Marine Bivalve and Aquaculture Studies
- Quantum and Classical Electrodynamics
Brookhaven National Laboratory
2016-2025
Stony Brook University
1990-2025
Brookhaven College
2002-2024
University of California, Riverside
2024
Mississippi State University
2022
Heidelberg University
2016-2021
Heidelberg Institute for Theoretical Studies
2021
Baruch College
2010-2018
The Graduate Center, CUNY
2010-2018
American Physical Society
2018
We argue that the distribution functions for quarks and gluons are computable at small x sufficiently large nuclei, perhaps larger than can be physically realized. For such we weak coupling methods may used. show computation of recast as a many body problem with modified propagator, constant which depends on multiplicity particles per unit rapidity area, non-abelian gauge theories, some extra media dependent vertices. explicitly compute function to lowest order, how they computed in higher order.
We show that the gluon distribution function for very large nuclei may be computed small transverse momentum as correlation functions of an ultraviolet finite two dimensional Euclidean field theory. This computation is valid to all orders in density partons per unit area, but lowest order $\alpha_s$. The proportional $1/x$, and effect modify dependence on momentum.
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 provide a broad overview of the theoretical status and phenomenological applications Color Glass Condensate effective field theory describing universal properties saturated gluons in hadron wavefunctions that are extracted from deeply inelastic scattering hadron-hadron collision experiments at high energies.
We compute the Green's functions for scalars, fermions and vectors in color field associated with infinite momentum frame wavefunction of a large nucleus. Expectation values this can be computed by integrating over random orientations valence quark charge density. This relates to correlation two dimensional, ultraviolet finite, theory. show how one sea distribution functions, explictly them kinematic range transverse momenta, $\alpha_s^2 \mu^2 << k_t^2 \mu^2$, where $\mu^2$ is average...
We compute initial conditions in heavy ion collisions within the color glass condensate framework by combining impact parameter dependent saturation model with classical Yang-Mills description of Glasma fields. In addition to fluctuations nucleon positions, this includes quantum charges on length scale determined inverse nuclear ${Q}_{s}$. The naturally produces energy that are described a negative binomial distribution. ratio triangularity eccentricity...
Anisotropic flow coefficients v(1)-v(5) in heavy ion collisions are computed by combining a classical Yang-Mills description of the early time Glasma with subsequent relativistic viscous hydrodynamic evolution matter through quark-gluon plasma and hadron gas phases. The dynamics, as realized impact parameter dependent (IP-Glasma) model, takes into account event-by-event geometric fluctuations nucleon positions intrinsic subnucleon scale color charge fluctuations; preequilibrium is then...
The event-by-event multiplicity distribution, the energy densities and density weighted eccentricity moments ${\ensuremath{\epsilon}}_{n}$ (up to $n=6$) at early times in heavy-ion collisions both BNL Relativistic Heavy Ion Collider (RHIC) ($\sqrt{s}=200\phantom{\rule{0.16em}{0ex}}\mathrm{GeV}$) CERN Large Hardron (LHC) ($\sqrt{s}=2.76\phantom{\rule{0.16em}{0ex}}\mathrm{TeV}$) are computed IP-Glasma model. This framework combines impact parameter dependent saturation model (IP-Sat) for...
We perform a detailed comparison of long-range rapidity correlations in the color glass condensate framework to high multiplicity dihadron data proton-proton and proton-lead collisions from CMS, ALICE ATLAS experiments at LHC. The overall good agreement thus far nontrivial systematics theory with is strongly suggestive gluon saturation presence subtle quantum interference effects between separated gluons. In particular, yield pairs collimated their relative azimuthal angle...
We apply the successful Monte Carlo Glauber and IP-Glasma initial-state models of heavy-ion collisions to much smaller size systems produced in proton-proton, proton-nucleus, deuteron-nucleus collisions. observe a significantly greater sensitivity geometry details multiparticle production these compared nucleus-nucleus In particular, we find that system $p+A$ is very similar one $p+p$ predict comparable Hanbury-Brown-Twiss radii absence flow both systems. Differences eccentricities computed...
The impact-parameter dependent saturation model (IP-Sat) is a simple dipole that incorporates key features of the physics gluon and matches smoothly to perturbative QCD expression at large ${Q}^{2}$ for given $x$. It was previously shown gives good description HERA data suggesting evidence effects small has also been applied proton-proton proton-nucleus collisions provides basis IP-Glasma initial conditions in heavy ion collisions. Here we present reanalysis available electron-proton Bjorken...
The nonequilibrium evolution of heavy-ion collisions is studied in the limit weak coupling at very high energy employing lattice simulations classical Yang-Mills equations. Performing largest classical-statistical to date, we find that dynamics longitudinally expanding plasma becomes independent details initial conditions. After a transient regime dominated by instabilities and free streaming, subsequent space-time governed nonthermal fixed point, where system exhibits self-similar...
We study the thermalization process in highly occupied non-Abelian plasmas at weak coupling. The nonequilibrium dynamics of such systems is classical nature and can be simulated with real-time lattice gauge theory techniques. provide a detailed discussion this framework elaborate on results reported J. Berges, K. Boguslavski, S. Schlichting, R. Venugopalan, Phys. Rev. D 89, 074011 (2014) along novel findings. demonstrate emergence universal attractor solutions, which govern evolution large...
We compute the back-to-back dijet cross section in deep inelastic scattering at small <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>x</a:mi></a:math> to next-to-leading order (NLO) color glass condensate effective field theory. Our result can be factorized into a convolution of Weizsäcker-Williams gluon transverse-momentum-dependent distribution function (WW TMD) with universal soft factor and an NLO coefficient function. The includes both double single...
In very-high-energy nuclear collisions, the initial energy of produced gluons per unit area rapidity, (dE/L2)/deta, is equal to f(g(2)&mgr;L) (g(2)&mgr;)(3)/g(2), where &mgr;(2) proportional gluon density colliding nuclei. For an SU(2) gauge theory, a nonperturbative computation shows that it varies rapidly for small g(2)&mgr;L but only by approximately 25%, from 0.208+/-0.004 0.257+/-0. 005, wide range 35.36- 296.98 in g(2)&mgr;L. This includes relevant collisions at Relativistic Heavy Ion...
We compute quark structure functions and the intrinsic Fock space distribution of sea quarks in a hadron wave function at small $x.$ The computation is performed an effective theory $x$ where gluon field treated classically. At ${Q}^{2}$ large compared to scale associated with density gluons ${\ensuremath{\mu}}^{2},$ QCD ${\ensuremath{\Lambda}}_{\mathrm{QCD}}^{2},$ mass squared ${M}^{2},$ identical measured deep inelastic scattering. For ${Q}^{2}<~{M}^{2}$ but...
We discuss results from 3+1-D numerical simulations of SU(2) Yang--Mills equations for an unstable Glasma expanding into the vacuum after a high energy heavy ion collision. expand on our earlier work non-Abelian Weibel instability in such system and study behavior greater detail significantly larger lattices than previously. establish time scale onset demonstrate that growth rate is robust as one approaches continuum limit. For large violations boost invariance, effects cause soft modes to...
We present first results for (3 + 1)D simulations of SU(2) Yang-Mills equations matter expanding into the vacuum after a heavy ion collision. Violations boost invariance cause non-Abelian Weibel instability leading soft modes to grow with proper time tau as exp(gamma square root(g2 mu tau)), where g2 is scale arising from saturation gluons in nuclear wave function. The growth rate gamma set by plasmon mass, defined omega(pl) = kappa0 mu/tau)), generated dynamically compare numerical ratio...
The early stages of a relativistic heavy-ion collision are examined in the framework an effective classical SU(3) Yang-Mills theory transverse plane. We compute initial energy and number distributions, per unit rapidity, at midrapidity, gluons produced high-energy collisions. discuss phenomenological implications our results light recent Relativistic Heavy-Ion Collider data.