11439667
Schur functions, chiral bosons, and the quantum-Hall-effect edge states.
I demonstrate how the many-body wave function may be used to describe the bosonization of the edge excitations of a droplet of \ensuremath{\nu}=1 quantum-Hall liquid. In particular, I exhibit an isomorphism between the charge-neutral edge-state excitations of the droplet and the space of universal symmetric polynomials. There are two natural bases for this space; the first, the Schur functions, correspond to the fermion picture; the second, generated by the power sums, yields the Bose picture and the Kac-Moody algebra. I also show explicitly how the loop group LU(1) acts to create the coherent-state deformations of the droplet shape used in path-integral bosonization and in the quantization of chiral bosons.
49271770
Problems with Finite Density Simulations of Lattice QCD
We present a discussion of problems that have arisen in attempts to understand the behavior of lattice QCD at high densities. The effects observed in the lattice simulations do not seem to be consistent with what we expect from the usual ideas of chiral symmetry breaking. In particular, at zero quark mass, there does not seem to be a massive baryon at finite density.
120781979
Supersymmetry and the Quantum Mechanics of Spin
Abstract Bohr-Sommerfeld quantization is exact for a spin in a magnetic field. This well-known result is connected with the existence of a hidden supersymmetry. I discuss the supersymmetry and, in a broader context, the semiclassical quantum-mechanical interpretation of the Weyl character formula for compact, semisimple Lie groups.
122077297
Berry's Phase, Commutators and the Dirac Sea
Abstract We discuss the connection between the Berry phase and the Schwinger term in generators of symmetry groups, and stress the relative minus sign between the anomalous commutator of the currents and the anomalous commutator of the full group generators.
124848823
Six lectures on lattice field theory
121710395
Deconfinement and chiral symmetry restoration at finite temperatures in SU(2) and SU(3) gauge theories
At zero temperature SU(2) and SU(3) gauge theories confine quarks and spontaneously break chiral symmetry. At some non-zero temperatures T/sub c/(T/sub F/) these gauge theories lose confinement (chiral-symmetry breaking). We have studied the order of these phase transitions and the relation between T/sub c/ and T/sub F/ using simulation methods which neglect internal fermion loops. For SU(2) both transitions are second order and 1 less than or equal to T/sub F//T/sub c/ < 1.30. For SU(3) the transitions are first order and we find 1 less than or equal to T/sub F//T/sub c/ less than or equal to 1.05, with T/sub c/ approx. = 200 MeV.
32440270
Exclusive decays and masses of the B mesons.
22176544
Measurement of the direct photon spectrum from the Upsilon (1S).
16449251
Meson decay constants from isospin mass splittings in the quark model.
Decay constants of [ital D] and [ital B] mesons are estimated within the framework of a heavy-quark approach using measured isospin mass splittings in the [ital D], [ital D][sup *], [ital B], and [ital B][sup *] states to isolate the electromagnetic hyperfine interaction between quarks. A relation following from the use of splittings in kaons is also considered.
1906801
Improved upper limit on flavor-changing neutral-current decays of the b quark.
We report the results of a new search for flavor-changing neutral-current decays of the b quark and present a 90%-confidence-level upper limit for the branching fraction for B..-->..l/sup +/l/sup -/X of 1.2 x 10/sup -3/.
32942434
Determination of the cross sections for the production of fragments from relativistic nucleus-nucleus interactions. I. Measurements.
Relativistic iron, lanthanum, holmium, and gold projectile nuclei with several different energies have been fragmented in targets of polyethylene, carbon, aluminum, copper, and lead. Our detectors cleanly resolve the individual charges of the heaviest of these fragments and provide some limited information on the masses. We have measured 1256 elemental partial cross sections for the production of fragments from interactions in these target materials. Values have been derived for another 417 cross sections in a hydrogen medium. These cross sections depend on the energy and mass of the projectile nuclei as well as on the nature of the target. Total charge-changing cross sections were also found, but only in a composite target, and have been shown to be weakly dependent on energy. The mean mass losses observed for fragments that have lost a few protons show that typically many neutrons are lost with each proton, producing fragment nuclei that must be highly proton rich, and consequently very unstable. The cross sections for charge pickup on heavy targets show a rapid increase with decreasing energy, particularly for the heaviest targets. The systematics of the dependencies of the partial cross sections will be discussed in a companion paper.