Showing 2001Show all

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hep-ph2001★ 71 cited

Chirally symmetric quark description of low energy π-πscattering

Pedro Bicudo, Stephen Cotanch, Felipe Llanes-Estrada +3

Weinberg's theorem for π-πscattering, including the Adler zero at threshold in the chiral limit, is analytically proved for microscopic quark models that preserve chiral symmetry.…

cond-mat.mtrl-sci2001★ 153 cited

Spin relaxation of conduction electrons in bulk III-V semiconductors

Pil Hun Song, K. W. Kim

Spin relaxation time of conduction electrons through the Elliot-Yafet, D'yakonov-Perel and Bir-Aronov-Pikus mechanisms is calculated theoretically for bulk GaAs, GaSb, InAs and InS…

hep-ph2001

Light-Front QCD Hamiltonian Dynamics and Constituent Quark Picture in Exclusive Processes

Chueng-Ryong Ji, Ho-Meoyng Choi

After reviewing a connection between quantum chromodynamics and contituent quark model pictures in the light-front quantization with some comparison and contrast to the ordinary eq…

hep-ph2001★ 1 cited

Pion Form Factor and Quark Mass Evolution in a Light-Front Quark Model

Ho-Meoyng Choi, L. S. Kisslinger, Chueng-Ryong Ji

We discuss the soft contribution to the elastic pion form factor with the mass evolution from current to constituent quark being taken into account in a light-front quark model(LFQ…

hep-lat2001

Dynamical Fermions in Hamiltonian Lattice Gauge Theory

Dean Lee

We describe a first attempt to understand dynamical fermions within a Hamiltonian framework. As a testing ground we study compact QED3 which shares some important features of QCD4…

math.CA2001

Stability properties for a compactly supported prescale function

V. Dobric, R. F. Gundy, P. Hitczenko

We show that if is a continuous, minimally supported prescale function, then its translates are linearly independent on any set of positive measure in the unit interval. This g…

math.CA2001

Characterizations of orthonormal scale functions: a probabilistic approach

V. Dobric, R. F. Gundy, P. Hitczenko

The construction of a multiresolution analysis starts with specification of a scale function. The Fourier transform of this function is defined by an infinite product. The converge…

math.CO2001★ 7 cited

A generatingfunctionology approach to a problem of Wilf

Pawel Hitczenko, Cecil C. Rousseau, Carla D. Savage

Wilf posed the following problem: determine asymptotically as the probability that a randomly chosen part size in a randomly chosen composition of n has multiplicity m…

cond-mat2001

Lower energy bounds for quantum lattice Hamiltonians

Dean Lee, Nathan Salwen

We derive general lower energy bounds for the ground state energy of any translationally invariant quantum lattice Hamiltonian. The bounds are given by the ground state energy of r…

nucl-ex2001★ 70 cited

Measurements of ultracold neutron lifetimes in solid deuterium

C. L. Morris, J. M. Anaya, T. J. Bowles +24

We present the first measurements of the survival time of ultracold neutrons (UCNs) in solid deuterium SD2. This critical parameter provides a fundamental limitation to the effecti…

cs.CV2001★ 441 cited

Digital Color Imaging

Gaurav Sharma, H. Joel Trussell

This paper surveys current technology and research in the area of digital color imaging. In order to establish the background and lay down terminology, fundamental concepts of colo…

nucl-th2001★ 5 cited

Mesons as Bound States of Confined Quarks: Zero and Finite Temperature

Pieter Maris, Peter C. Tandy

We survey recent work on the properties and decays of mesons as bound states of confined quarks at both zero and finite temperature. The framework for these investigations is the s…

hep-ph2001★ 23 cited

Frame Dependence of Spin-One Angular Conditions in Light Front Dynamics

B. L. G. Bakker, C. -R. Ji

We elaborate the frame dependence of the angular conditions for spin-1 form factors. An extra angular condition is found in addition to the usual angular condition relating the fou…

astro-ph2001★ 79 cited

Hubble Space Telescope WFPC-2 Imaging of Cassiopeia A

Robert A. Fesen, Jon A. Morse, Roger A. Chevalier +4

The young SNR Cassiopeia A was imaged with WFPC-2 through four filters selected to capture the complete velocity range of the remnant's main shell in several important emission lin…

astro-ph2001★ 304 cited

Pulsar Wind Nebulae in Evolved Supernova Remnants

John M. Blondin, Roger A. Chevalier, Dargan M. Frierson

For pulsars similar to the one in the Crab Nebula, most of the energy input to the surrounding wind nebula occurs on a timescale of less than 1000 years; during this time, the nebu…

physics.bio-ph2001★ 22 cited

Folding thermodynamics of model four-strand antiparallel beta-sheet proteins

Hyunbum Jang, Carol K. Hall, Yaoqi Zhou

The thermodynamic properties for three different types of off-lattice four-strand beta-sheet protein models interacting via a hybrid Go-type potential have been investigated. Disco…

astro-ph2001★ 11 cited

Tests of Galactic Cosmic Ray Source Models

L O'C Drury, D C Ellison, F A Aharonian +9

This report discusses the possibilities for observational tests of current models and ideas regarding the origin of the Galactic Cosmic Rays using facilities which are already avai…

astro-ph2001★ 75 cited

Broad-band Observations and Modeling of the Shell-Type Supernova Remnant G347.3-0.5

Donald C. Ellison, Patrick Slane, Bryan M. Gaensler

The supernova remnant G347.3--0.5 emits a featureless power-law in X-rays, thought to indicate shock-acceleration of electrons to high energies. We here produce a broad-band spectr…

astro-ph2001★ 44 cited

Spatially-resolved Thermal Continuum Absorption against the Supernova Remnant W49B

C. K. Lacey, T. Joseph W. Lazio, Namir E. Kassim +3

We present sub-arcminute resolution imaging of the Galactic supernova remnant W49B at 74 MHz (25") and 327 MHz (6"), the former being the lowest frequency at which the source has b…

hep-ph2001★ 26 cited

Poincare Invariant Algebra From Instant to Light-Front Quantization

Chueng-Ryong Ji, Chad Mitchell

We present the Poincare algebra interpolating between instant and light-front time quantizations. The angular momentum operators satisfying SU(2) algebra are constructed in an arbi…

hep-ph2001★ 40 cited

Nonperturbative Vacuum Effect in the Quantum Field Theory of Meson Mixing

Chueng-Ryong Ji, Yuriy Mishchenko

Replacing the perturbative vacuum by the nonperturbative vacuum, we extend a recent development of a quantum field theoretic framework for scalar and pseudoscalar meson mixing. The…

hep-ph2001★ 9 cited

Perturbative QCD and factorization of coherent pion photoproduction on the deuteron

S. J. Brodsky, J. R. Hiller, Chueng-Ryong Ji +1

We analyze the predictions of perturbative QCD for pion photoproduction on the deuteron, gamma D -> pi^0 D, at large momentum transfer using the reduced amplitude formalism. The cl…

hep-ph2001★ 1 cited

New Progress in Time-Like Exclusive Processes

Chueng-Ryong Ji, Ho-Meoyng Choi

We discuss a necessary nonvalence contribution in timelike exclusive processes. Following a Schwinger-Dyson type of approach, we relate the nonvalence contribution to an ordinary l…

math.QA2001★ 6 cited

Twisted vertex representations and spin characters

Naihuan Jing, Weiqiang Wang

We establish a new group-theoretic realization of the basic representations of the twisted affine and twisted toroidal algebras of ADE types in the same spirit of our new approach…