44 research outputs found
Point Charge Dynamics Near a Grounded Conducting Plane
The classic image problem in electromagnetism involves a grounded infinite
conducting plane and a point charge. The force of attraction between the point
charge and the plane is identified using an equivalent-field picture of an
image charge with opposite sign equidistant behind the plane resulting in a
1/{\it r} force of attraction between the original charge and the
plane. If the point charge is released from rest it will reach the plane in a
time . This time has not been calculated correctly up to now.
Clarification of the inconsistency is presented along with a correct solution
to the classic image problem. Other electromagnetism problems are mentioned
with attractive 1/{\it r} forces (where {\it n} 1). Such
situations arise between a point charge and a line charge (1/{\it r}), between
a line charge and a point dipole (1/{\it r}), between a point charge and
a point dipole (1/{\it r}, and between a point dipole and a second point
dipole (1/{\it r}).Comment: 6 pages, 4 figure
Phi Meson Propagation and Decay at Finite Temperature
We study spectral properties of the phi meson at finite temperature using an
effective Lagrangian together with finite-temperature field theory as a basis
for modeling. General field-theoretic arguments are then used to establish the
lifetime of the phi in hot hadronic matter. We find from the model, and we
therefore propose a scenario in which, the phi decays inside the fireball.
Early decays into occur at high temperature while measurable
hadronic decays into (not suffering rescattering) occur at
freezeout, where flow could be substantial. These results provide a consistent
picture, if not possible interpretation of the NA49 and NA50 data from CERN.Comment: 7 pages, 3 postscript figures, Talk given at the 20th Winter Workshop
on Nuclear Dynamics, Trelawny Beach, Jamaica, 15-20 March 200
Short-Lived Phi Mesons
We use effective hadronic field theory to study in-medium properties of the
meson. The dominant decay channels \phi\toK^{+}K^{-} and
are modeled using an SU(3) chiral Lagrangian with normal and
abnormal parities. The self-energy is approximated to one-, two-, and
even three-loop order in the strong coupling. Effects of modified spectral
functions for , , and are also included in the
calculation. This allows us to study in-medium decay of phi mesons into
(in-medium) kaon-pair daughters and (in-medium) pairs. The results
point to the possibility of rather short-lived 's, short enough to decay
inside the fireball in relativistic heavy ion collisions. Implications relevant
for the NA49 and NA50 experimental results, recently dubbed the ``
puzzle'', are discussed.Comment: 7 pages Latex, 4 figures, Talk presented at Hot Quarks 2004, July
18-24, 2004, Taos Valley, NM, US