33,555 research outputs found
Racial Ethnic Equality in Child Well-Being from 1985-2004: Gaps Narrowing, but Persist
Analyzes changes in safety/behavioral concerns, family economic well-being, health, community connectedness, educational attainment, social relationships, and emotional/spiritual well-being by race and ethnicity. Tracks disparities between groups
The role of hyperfine mixing in semileptonic and electromagnetic decays of doubly-heavy baryons
We analyze the effects of hyperfine mixing in semileptonic and
electromagnetic decays of doubly heavy baryons.Comment: Talk given at the Chiral 10 Conferenc
The effect of hyperfine mixing in electromagnetic and semileptonic decays of doubly heavy baryons
We consider the role played by hyperfine mixing in electromagnetic and
semileptonic decays of doubly heavy baryons, which give rise to large
corrections to the decay widths in both cases.Comment: Talk given in Quark Confinement and the Hadron Spectrum IX, Madrid
September 201
Study of semileptonic and nonleptonic decays of the meson
We evaluate semileptonic and two--meson nonleptonic decays of the
meson in the framework of a nonrelativistic quark model. The former are done in
spectator approximation using one--body current operators at the quark level.
Our model reproduces the constraints of heavy quark spin symmetry obtained in
the limit of infinite heavy quark mass. For the two--meson nonleptonic decays
we work in factorization approximation. We compare our results to the ones
obtained in different relativistic approaches.Comment: Talk given at the IVth International Conference on Quarks an Nuclear
Physics, Madrid, June 5th-10th 200
Simple model for the phase coexistence and electrical conductivity of alkali fluids
We report the first theoretical model for the alkali fluids which yields a
liquid-vapor phase coexistence with the experimentally observed features and
electrical conductivity estimates which are also in accord with observations.
We have carried out a Monte Carlo simulation for a lattice gas model which
allows an integrated study of the structural, thermodynamic, and electronic
properties of metal-atom fluids. Although such a technique is applicable to
both metallic and nonmetallic fluids, non-additive interactions due to valence
electron delocalization are a crucial feature of the present model.Comment: RevTex, 11 pages, 2 ps figure files appended, submitted to PR
Study of theoretical models for the liquid-vapor and metal-nonmetal transitions of alkali fluids
Theoretical models for the liquid-vapor and metal-nonmetal transitions of
alkali fluids are investigated. Mean-field models are considered first but
shown to be inadequate. An alternate approach is then studied in which each
statistical configuration of the material is treated as inhomogeneous, with the
energy of each ion being determined by its local environment. Nonadditive
interactions, due to valence electron delocalization, are a crucial feature of
the model. This alternate approach is implemented within a lattice-gas
approximation which takes into account the observed mode of expansion in the
materials of interest and which is able to treat the equilibrium density
fluctuations. We have carried out grand canonical Monte Carlo simulations, for
this model, which allow a unified, self-consistent, study of the structural,
thermodynamic, and electronic properties of alkali fluids. Applications to Cs,
Rb, K, and Na yield results in good agreement with observations.Comment: 13 pages, REVTEX, 10 ps figures available by e-mail
- …