76 research outputs found
Potentials between heavy-light mesons from lattice and inverse scattering theory
We extend our investigation of heavy-light meson-meson interactions to a
system consisting of a heavy-light meson and the corresponding antiparticle. An
effective potential is obtained from meson-antimeson Green-functions computed
in a quenched simulation with staggered fermions. Comparisons with a simulation
using an tree-level and tadpole improved gauge action and a full QCD
simulation show that lattice discretization errors and dynamical quarks have no
drastic influence. Calculations from inverse scattering theory propose a
similar shape for potentials.Comment: 3 pages, 5 EPS figures, Poster presented at "Lattice'97", to appear
in the proceeding
Statistical and Dynamic Models of Charge Balance Functions
Charge balance functions, which identify balancing particle-antiparticle
pairs on a statistical basis, have been shown to be sensitive to whether
hadronization is delayed by several fm/c in relativistic heavy ion collisions.
Results from two classes of models are presented here, microscopic hadronic
models and thermal models. The microscopic models give results which are
contrary to recently published pi+pi- balance functions from the STAR
collaboration, whereas the thermal model roughly reproduce the experimental
results. This suggests that charge conservation is local at breakup, which is
in line with expectations for a delayed hadronization. Predictions are also
presented for balance functions binned as a function of Q_inv.Comment: 12 pages 6 figure
Thermal production of the meson in the channel
Recent measurements of the pi^+pi^- invariant mass distribution at RHIC show
a shifted peak for the rho meson in 100A GeV in peripheral Au + Au and even in
p + p collisions. A recent theoretical study based on a picture of in-medium
production rates of pions, showed that a large shift could result from a
combination of the Boltzmann factor and the collisional broadening of the rho.
Here we argue that the two-pion density of states is the appropriate quantity
if one assumes a sudden break-up of the system. Methods for calculating the
density of states which include Bose effects are derived. The resulting
invariant mass distributions are significantly enhanced at lower masses and the
rho peak is shifted downward by ~ 35 MeV.Comment: 10 pages, 4 figure
CSL 2008 special issue
This special issue of ACM Transactions on Computational Logic is devoted to papers first presented at the 17th Annual Conference of the European Association for Computer Science Logic (CSL 2008), held September 16\u201319, 2008, in Bertinoro, near Bologna (Italy)
Poor effectiveness of antenatal detection of fetal growth restriction and consequences for obstetric management and neonatal outcomes: a French national study
International audienc
Poor effectiveness of antenatal detection of fetal growth restriction and consequences for obstetric management and neonatal outcomes: a French national study
International audienc
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