3,648 research outputs found
D_{sJ}(2860) as the first radial excitation of the D_{s0}^*(2317)
A coupled-channel model previously employed to describe the narrow
(2317) and broad (2400) charmed scalar mesons is generalized
so as to include all ground-state pseudoscalar-pseudoscalar and vector-vector
two-meson channels. All parameters are chosen fixed at published values, except
for the overall coupling constant, which is fine-tuned to reproduce the
(2317) mass. Thus, the radial excitations (2850) and
(2740) are predicted, both with a width of about 50 MeV. The former
state appears to correspond to the new (2860) resonance decaying to
announced by BABAR in the course of this work. Also the (2400)
resonance is roughly reproduced, though perhaps with a somewhat too low central
resonance peak.Comment: Plain LaTeX, 4 pages, 2 Postscript figures; v2: REVTeX, 4 pages,
introduction expanded, "Note added in proof" and references added, figures
with more detail and improved quality, version accepted for publication in
Physical Review Letter
Multichannel calculation of the very narrow and the very broad
The narrow (2317) and broad (2300-2400) charmed
scalar mesons and their radial excitations are described in a coupled-channel
quark model that also reproduces the properties of the light scalar nonet. All
two-meson channels containing ground-state pseudoscalars and vectors are
included. The parameters are chosen fixed at published values, except for the
overall coupling constant , which is fine-tuned to reproduce the
(2317) mass, and a damping constant for subthreshold
contributions. Variations of and (2300-2400) pole
postions are studied for different values. Calculated cross sections
for -wave and scattering, as well as resonance pole positions,
are given for the value of that fits the light scalars. The thus
predicted radially excited state (2850), with a width of about 50
MeV, seems to have been observed already.Comment: 3 pages, EPJ LaTeX, 2 Postscript figures, 1 table; parallel talk at
the IVth International Conference on Quarks and Nuclear Physics (QNP06),
Madrid, 5-10 June 200
A very broad X(4260) and the resonance parameters of the 3D vector charmonium state
We argue that the X(4260) enhancement contains a wealth of information on
vector c-cbar spectroscopy. We discuss the shape of the X(4260) observed in the
OZI-forbidden process "electron-positron into J/psi and a pair of charged
pions", in particular at and near vector charmonium resonances as well as
open-charm threshold enhancements. The resulting very broad X(4260) structure
does not seem to classify itself as a vector charmonium resonance, but its
detailed shape allows to identify new vector c-cbar states. Here, we estimate
the resonance parameters of the psi(3D) state.Comment: 4 pages, 5 figures; version 2: 2 figures replace
The Use of Classical Mythology in Edmund Spenser\u27s Faerie Queene Book I and II
For the proper understanding of this thesis, it is necessary to state explicitly what it does not attempt to do. It is absolutely not an examination into the sources of Spenser\u27s classical mythology. That research work has already been done in two published studies; namely, The Sources of Spenser\u27s Classical Mythology by A. E. Sawtelle and a second work with the same title by A. S. Randall. The connection of Virgil and Spenser has been treated by M. G. Hughes in Virgil and Spenser
Casenotes: Antitrust Laws — Agreement among Competing Physicians Setting Maximum Fees That May Be Claimed for Health Services Provided to Policyholders of Specified Insurance Plans Is a per Se Violation of the Sherman Antitrust Act. Arizona v. Maricopa County Medical Society, 457 U.S. 332 (1982)
The effects of age and ganglioside composition on the rate of motor nerve terminal regeneration following antibody-mediated injury in mice
Gangliosides are glycosphingolipids highly enriched in neural plasma membranes, where they mediate a diverse range of functions and can act as targets for auto-antibodies present in human immune-mediated neuropathy sera. The ensuing autoimmune injury results in axonal and motor nerve terminal (mNT) degeneration. Both aging and ganglioside-deficiency have been linked to impaired axonal regeneration. To assess the effects of age and ganglioside expression on mNT regeneration in an autoimmune injury paradigm, anti-ganglioside antibodies and complement were applied to young adult and aged mice wildtype (WT) mice, mice deficient in either b- and c-series (GD3sKO) or mice deficient in all complex gangliosides (GM2sKO). The extent of mNT injury and regeneration was assessed immediately or after 5 days, respectively. Depending on ganglioside expression and antibody-specificity, either a selective mNT injury or a combined injury of mNTs and neuromuscular glial cells was elicited. Immediately after induction of the injury, between 1.5% and 11.8% of neuromuscular junctions (NMJs) in the young adult groups exhibited healthy mNTs. Five days later, most NMJs, regardless of age and strain, had recovered their mNTs. No significant differences could be observed between young and aged WT and GM2sKO mice; aged GD3sKO showed a mildly impaired rate of mNT regeneration when compared with their younger counterparts. Comparable rates were observed between all strains in the young and the aged mice. In summary, the rate of mNT regeneration following anti-ganglioside antibody and complement-mediated injury does not differ majorly between young adult and aged mice irrespective of the expression of particular gangliosides
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