Thomas DeGrand
A5044723495- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Quantum chaos and dynamical systems
- Computational Physics and Python Applications
- Cold Atom Physics and Bose-Einstein Condensates
- International Science and Diplomacy
- Nuclear physics research studies
- Random Matrices and Applications
- Distributed and Parallel Computing Systems
- Quantum many-body systems
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Organic and Molecular Conductors Research
- Advanced Chemical Physics Studies
- Astrophysics and Cosmic Phenomena
- Quantum and electron transport phenomena
- Spectroscopy and Quantum Chemical Studies
- Quantum Mechanics and Non-Hermitian Physics
University of Colorado Boulder
2015-2024
University of Colorado System
2000-2024
Michigan State University
2019
Brookhaven National Laboratory
2019
RIKEN BNL Research Center
2019
Tel Aviv University
2009-2014
Tohoku University
2008
Max Planck Institute for Physics
2003
North Atlantic Treaty Organization
1999-2001
Washington University in St. Louis
1992-2000
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,062 new measurements 721 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. All search limits are listed in Summary Tables. also give numerous tables, figures, formulae, reviews...
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,873 new measurements 758 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae, reviews...
This biennial Review summarizes much of particle physics. Using data from previous editions, plus 2658 new measurements 644 papers, we list, evaluate, and average measured properties gauge bosons, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as Higgs heavy neutrinos, supersymmetric particles. All the search limits are listed in Summary Tables. also give numerous tables, figures, formulae, reviews topics Standard Model, detectors, probability,...
Abstract The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,143 new measurements 709 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae,...
Abstract The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,324 new measurements 878 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae,...
The masses and static parameters of the light hadrons (the pseudoscalar vector meson nonets baryon octet decuplet) are calculated using bag model. effects quark kinetic energy, strange-quark mass, colored-gluon exchange in lowest order, energy associated with certain quantum fluctuations included. These parameterized by four constants which have fundamental significance do not change from multiplet to multiplet. fit spectrum is good. ordering all states given correctly. intramultiplet...
The summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,717 new measurements 869 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae, reviews topics...
We present results from a lattice hadron spectrum calculation using three flavors of dynamical quarks --- two light and one strange---and quenched simulations for comparison. These were done one-loop Symanzik improved gauge action an Kogut-Susskind quark action. The spacings, hence also the physical volumes, tuned to be same in all runs better expose differences due flavor number. Lattice spacings static potential, so as by-product we obtain updated effect sea on potential. find indications...
We study the phase structure of lattice electrodynamics in three and four dimensions using Monte Carlo simulation, with special emphasis on topological excitations theory. formulate an operational definition a monopole measure density monopoles as function coupling constant. In for strong screen external magnetic fields. Below critical field penetrates into bulk medium; this long-range correlation essentially shows that theory weak is characterized by massless photon.
We have carried out a Schrodinger functional calculation for the SU(3) lattice gauge theory with two flavors of Wilson fermions in sextet representation group. find that discrete beta function, which governs change running coupling under spatial scale, changes sign when renormalized is neighborhood ${g}^{2}=2.0$. The simplest explanation has an infrared-attractive fixed point, but more complicated possibilities are allowed by data. While we compare rescalings factors 2 and $4/3$, work at...
Originally developed for quantum chromodynamics at strong coupling, lattice approximations provide an essential tool applicable to any strongly coupled gauge theory. The resolution of the lightweight Higgs puzzle may require new theories shorter distances. This review introduces modern kit as a combination analytical and numerical techniques. Numerous applications physics with coupling are presented, results analyzed.
Since gluons in QCD are interacting fundamental constituents just as quarks are, we expect that addition to mesons made from a quark and an antiquark, there should also be glueballs hybrids (bound states of quarks, antiquarks, gluons). In general, these would mix strongly with the conventional $\overline{q}q$ mesons. However, they can have exotic quantum numbers inaccessible Confirmation such give information on role ``dynamical'' color low energy QCD. quenched approximation present lattice...
The parton-recombination model plus SU(6) symmetry is used to relate polarizations in inclusive baryon production those of the underlying constituent subprocesses. A description origin polarization asymmetry terms Thomas precession quarks' spins recombination process accounts for all qualitative features and antibaryon data.
We have performed numerical simulations of SU(3) gauge theory coupled to ${N}_{f}=2$ flavors symmetric-representation fermions. The fermions are discretized with the tadpole-improved clover action. Our done on lattices length $L=6$, 8, and 12. In all simulation volumes we observe a crossover from strongly confined phase weak-coupling deconfined phase. Degeneracies in screening masses, plus behavior pseudoscalar decay constant, indicate that is also which chiral symmetry restored. movement...
We apply Schr\"odinger-functional techniques to the SU(2) lattice gauge theory with ${N}_{f}=2$ flavors of fermions in adjoint representation. Our use hypercubic smearing enables us work at stronger couplings than did previous studies, before encountering a critical point and bulk phase boundary. Measurement running coupling constant gives evidence an infrared fixed ${g}_{*}$ where $1/{g}_{*}^{2}=0.20(4)(3)$. At point, we find mass anomalous dimension ${\ensuremath{\gamma}}_{m}({g}_{*})=0.31(6)$.
We study the effect of electron-electron correlations on energetics solitons in electron-phonon models quasi one-dimensional materials. In these combined Peierls-Hubbard models, by use quantum Monte Carlo techniques, we (1) establish that ground state an odd chain, singly charged or neutral, is a soliton; (2) calculate neutral-soliton creation energies; and (3) prove "soliton doping" persists presence correlations. discuss relevance our results for trans-polyacetylene.
We predict a new source of jet structure in ${e}^{+}{e}^{\ensuremath{-}}$ colliding-beam experiments arising from photon-photon collisions. These jets are produced with sizable fraction the total observable hadronic rate and have unmistakable signatures. Observations these would provide important tests contributions three classes hard-scattering mechanisms: quark exchange $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}q\overline{q}$, gluon $\mathrm{qq}$ $q\overline{q}$...