1,357 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
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
Light meson electromagnetic form factors from three-flavor lattice QCD with exact chiral symmetry
We study the chiral behavior of the electromagnetic (EM) form factors of pion
and kaon in three-flavor lattice QCD. In order to make a direct comparison of
the lattice data with chiral perturbation theory (ChPT), we employ the overlap
quark action that has exact chiral symmetry. Gauge ensembles are generated at a
lattice spacing of 0.11 fm with four pion masses ranging between M_pi \simeq
290 MeV and 540 MeV and with a strange quark mass m_s close to its physical
value. We utilize the all-to-all quark propagator technique to calculate the EM
form factors with high precision. Their dependence on m_s and on the momentum
transfer is studied by using the reweighting technique and the twisted boundary
conditions for the quark fields, respectively. A detailed comparison with SU(2)
and SU(3) ChPT reveals that the next-to-next-to-leading order terms in the
chiral expansion are important to describe the chiral behavior of the form
factors in the pion mass range studied in this work. We estimate the relevant
low-energy constants and the charge radii, and find reasonable agreement with
phenomenological and experimental results.Comment: 59 pages, 34 figure
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
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