5,147 research outputs found
Preliminary results of the heavy-light meson spectrum using chirally improved light quarks
Using a ``wall'' of quark point sources, we invert the chirally improved
Dirac operator to create an ``incoherent'' collection of quark propagators
which originate from all spatial points of the source time slice. The
lowest-order NRQCD approximation is used to create heavy-quark propagators from
the same wall source. However, since the numerical cost involved in computing
such heavy-quark propagators is low, we are able to use a number of source
gauge paths to establish coherence between the heavy and light quarks at
several spatial separations. The resulting collection of heavy-light meson
correlators is analyzed to extract the corresponding mass spectrum.Comment: 3 pages, 1 figure, Lattice2004(spectrum), minor corrections adde
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Energies of B_s meson excited states - a lattice study
This is a follow-up to our earlier work on the energies and radial
distributions of heavy-light mesons. The heavy quark is taken to be static
(infinitely heavy) and the light quark has a mass about that of the strange
quark. We now concentrate on the energies of the excited states with higher
angular momentum and with a radial node. A new improvement is the use of
hypercubic blocking in the time direction.
The calculation is carried out with dynamical fermions on a 16 cubed times 32
lattice with a lattice spacing approximately 0.1 fm generated using a
non-perturbatively improved clover action.
In nature the closest equivalent of this heavy-light system is the B_s meson,
which allows us to compare our lattice calculations to experimental results
(where available) or to give a prediction where the excited states,
particularly P-wave states, should lie. We pay special attention to the
spin-orbit splitting, to see which one of the states (for a given angular
momentum L) has the lower energy. An attempt is made to understand these
results in terms of the Dirac equation.Comment: 35 pages. v3: Data from two new lattices added. New results in
several chapter
Excited hadrons on the lattice: Mesons
We present results for masses of excited mesons from quenched calculations
using chirally improved quarks at pion masses down to 350 MeV. The key features
of our analysis are the use of a matrix of correlators from various source and
sink operators and a basis which includes quark sources with different spatial
widths, thereby improving overlap with states exhibiting radial excitations.Comment: 8 pages, 8 figures; version accepted to PR
Switching in magnetite: a thermally driven magnetic phase transition
Journal ArticleWe have performed a variety of experiments on switching phenomena in a metal oxide, magnetite. Our findings are consistent with Joule microheating which drives the Verwey transition occurring at 119 K. We conclude that considerations of band structure, direct electric-field-induced transitions, tunneling, injection, and space-charge phenomena are not required to explain any of our observations
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