1,191 research outputs found
Precision study of B^* B\pi coupling for the static heavy-light meson
We compute the B^*B\pi coupling \hat{g}_{\infty} for static heavy-light meson
using all-to-all propagators. It is shown that low-mode averaging with 100
low-lying eigenmodes indeed improves the signal for the 2-point and 3-point
functions for heavy-light meson significantly. Our study suggests that the
all-to-all propagator will be a very efficient method for high precision
computation of the B^*B\pi coupling especially in unquenched QCD where the
number of configurations is limited.Comment: 30 pages, 25 figures, typos correcte
Perturbative Study of the Supersymmetric Lattice Theory from Matrix Model
We study the lattice model for the supersymmetric Yang-Mills theory in two
dimensions proposed by Cohen, Kaplan, Katz, and Unsal. We re-examine the formal
proof for the absence of susy breaking counter terms as well as the stability
of the vacuum by an explicit perturbative calculation for the case of U(2)
gauge group. Introducing fermion masses and treating the bosonic zero momentum
mode nonperturbatively, we avoid the infra-red divergences in the perturbative
calculation. As a result, we find that there appear mass counter terms for
finite volume which vanish in the infinite volume limit so that the theory
needs no fine-tuning. We also find that the supersymmetry plays an important
role in stabilizing the lattice space-time by the deconstruction.Comment: 36 pages, 18 figures; typos corrected, some definitions added,
appendix including feynman dyagram delete
Dual-camera system for high-speed imaging in particle image velocimetry
Particle image velocimetry is an important technique in experimental fluid
mechanics, for which it has been essential to use a specialized high-speed
camera. However, the high speed is at the expense of other performances of the
camera, i.e., sensitivity and image resolution. Here, we demonstrate that the
high-speed imaging is also possible with a pair of still cameras.Comment: 4 pages, accepted by Journal of Visualization (see
http://www.springerlink.com
Charmonium spectroscopy with heavy Kogut-Susskind quarks
Charmonium spectroscopy with Kogut-Susskind valence quarks are carried out
for quenched QCD at and for two-flavor full QCD at .
Results for 1P--1S mass splitting and estimates of
are reported. Problems associated with
flavor breaking effects and finite size effects of states are discussed.Comment: 3 pages, contribution to the Lattice '94 conference, uuencoded
compressed ps-fil
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