3,846 research outputs found
Heavy-to-light form factors in the quark model with heavy propagators
We calculate the heavy-to-light form factors in the relativistic quark model
with heavy infrapropagators. Their q^2-dependence in the physical region is
defined by two parameters: the "infrared" parameter \nu characterizing the
infrared behavior of the heavy quark and the mass difference of the heavy meson
and heavy quark E=m_H-M_Q. It is found that the values of the D\to K(K^*) and
D\to \pi(\rho) form factors at q^2=0 are in excellent agreement with the
available experimental data and other approaches whereas these values for B\to
\pi(\rho) transitions are found to be larger than those of several other
models. The obtained form factors are used to calculate the widths of the
semileptonic decays of B and D mesons. The comparison of our results with the
available experimental data and other approaches is givenComment: 15 pages, 3 eps figures. New references are added, corrected some
typos. To appear in Few-Body System
Modified Laplace transformation method and its application to the anharmonic oscillator
We apply a recently proposed approximation method to the evaluation of
non-Gaussian integral and anharmonic oscillator. The method makes use of the
truncated perturbation series by recasting it via the modified Laplace integral
representation. The modification of the Laplace transformation is such that the
upper limit of integration is cut off and an extra term is added for the
compensation. For the non-Gaussian integral, we find that the perturbation
series can give accurate result and the obtained approximation converges to the
exact result in the limit ( denotes the order of perturbation
expansion). In the case of anharmonic oscillator, we show that several order
result yields good approximation of the ground state energy over the entire
parameter space. The large order aspect is also investigated for the anharmonic
oscillator.Comment: 26 pages including tables, Late
D Mesons in Nuclear Matter: A DN Coupled-Channel Equations Approach
A set of coupled two-body scattering equations is solved for the DN system
embedded in an iso-symmetric nuclear matter. The in-medium behavior of charmed
D mesons: (D^+,D^0), is investigated from the self-consistent solution within
this scheme. The effective meson-baryon Lagrangian in charm quantum number one
sector, the key ingredient in the present study, is adopted from a recent model
by Hofmann and Lutz which has aimed at combining the charmed meson degree of
freedom in a consistent manner with chiral unitary models. After a critical
examination, the original model is modified in several important aspects, such
as the method of regularization, in order to be more consistent and practical
for our objective. The resultant interaction is used to reproduce the position
and width of the s-wave \Lambda_c(2593) resonance in the isospin zero DN
channel. In the isospin one channel, it generates a rather wide resonance at
\~2770 MeV. The corresponding in-medium solution is then sought by
incorporating Pauli blocking and the D- and \pi-meson dressing
self-consistently. At normal nuclear matter density, the resultant \Lambda_c
(2593) is found to stay narrow and shifted at a lower energy, while the I=1
resonance is lowered in position as well and broadened considerably. The
possible implication of our findings on the J/\Psi suppression, etc. in
relativistic heavy ion collisions is briefly discussed.Comment: 30 pages, 8 eps figures, some typos and coefficients corrected,
published in Phys. Rev.
Recommended from our members
Derivation of globally averaged lunar heat flow from the local heat flow values and the Thorium distribution at the surface: expected improvement by the LUNAR-A Mission
The relationship between the Th abundance and the heat flow data of the Apollo sites and the LUANR-A sites, where the Th concentrations are in the wide range from 1 ppm to 6 ppm, will allow for a more precise estimation of the averaged heat flow value
Recommended from our members
Thermal in situ measurements in the Lunar Regolith using the LUNAR-A penetrators: an outline of data reduction methods
For determining the lunar heat flow two parameters need to be measured: The thermal gradient and the thermal conductivity of the regolith. Methods for inferring these quantities from in situ measurements using the LUNAR-A penetrators will be presented
Recommended from our members
In situ lunar heat flow experiment using the LUNAR-A penetrator
An in situ lunar heat flow measurement is planned using the Japanese Lunar-A penetrators. The temperature gradient of the regolith is expected to be obtained within 12% error
Kinematics of Tidal Debris from Omega Centauri's Progenitor Galaxy
We present the kinematic properties of a tidally disrupted dwarf galaxy in
the Milky Way, based on the hypothesis that its central part once contained the
most massive Galactic globular cluster, omega Cen. Dynamical evolution of a
self-gravitating progenitor galaxy that follows the present-day and likely past
orbits of omega Cen is calculated numerically and the kinematic nature of their
tidal debris is analyzed, combined with randomly generated stars comprising
spheroidal halo and flat disk components. We show that the retrograde rotation
of the debris stars at km/s accords with a recently discovered,
large radial velocity stream at km/s towards the Galactic longitude
of . These stars also contribute, only in part, to a reported
retrograde motion of the outer halo at the North Galactic Pole. The prospects
for future debris searches and the implications for the early evolution of the
Galaxy are briefly presented.Comment: 14 pages, 3 figures, accepted for publication in ApJ Letter
Effect of Conjunctive Use of Water for Paddy Field Irrigation on Groundwater Budget in an Alluvial Fan
Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a Technical Paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 5 (2003): A. Elhassan, A. Goto, and M. Mizutani. Effect of Conjunctive Use of Water for Paddy Field Irrigation on Groundwater Budget in an Alluvial Fan. Vol. V. December 2003
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