John W. Negele

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Since present Monte Carlo algorithms for lattice QCD may become trapped in a fixed topological charge sector, it is important to understand the effect of calculating at fixed topology. In this work, we show that although the restriction to a fixed topological sector becomes irrelevant in the infinite volume limit, it gives rise to characteristic finite size(More)
We present the resolution of a long-standing discrepancy between the moments of parton distributions calculated from lattice QCD and their experimental values. We propose a simple extrapolation formula for the moments of the nonsinglet quark distribution u-d, as a function of quark mass, which embodies the general constraints imposed by the chiral symmetry(More)
The implications of lattice field theory for particle physics go far beyond the traditional studies of low energy QCD phenomenology which are currently the major focus of the field. New strongly coupled field theories may well be discovered at LHC scales; for these the lattice will be the major tool. Also supersymmetry is important to many high energy(More)
This work brings new insight to the venerable question of whether there is a low energy effective theory based on classical (pseudoparticle) degrees of freedom that embodies the two essential features of SU(2) Yang Mills theory: confinement and chiral symmetry breaking. We first consider all the relevant gauge field degrees of freedom, aμ(zi, hi),(More)
Cooling is used as a lter on a set of gluon elds sampling the Wilson action to selectively remove essentially all uctuations of the gluon eld except for the instantons. The close agreement between quenched lattice QCD results with cooled and uncooled conngurations for vacuum correlation functions of hadronic currents and for density-density correlation(More)
  • Lhpc Collaboration, R G Edwards, +7 authors W Schroers
LHPC Collaboration: R.G. Edwardsa, G. Flemingb, Ph. Häglerc, J.W. Negele∗d , K. Orginosa,e, A.V. Pochinskyd, D.B. Renner∗ f , D.G. Richardsa, W. Schroersg aThomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA bSloane Physics Laboratory, Yale University, New Haven, CT 06520, USA cInstitut für Theoretische Physik, TU München, D-85747(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We present lattice QCD calculations of nucleon electromagnetic form factors(More)
Chiral symmetry breaking and confinement of color charge, the two essential features of low-energy QCD, cannot be understood perturbatively in the coupling constant. Two complementary nonperturbative approaches are analytical approximation using semiclassical analysis of the QCD path integral (analogous to the WKB approximation in quantum mechanics) and(More)
We perform a quenched computation of the glue momentum fraction in the pion. Different dis-cretizations of the gluonic energy-momentum tensor are studied on the lattice for that purpose. We discuss some implications based on the momentum sum rule. Finally we point out promising applications of the techniques developed here.