13,098 research outputs found
Semi-Leptonic B Decay
The definitions and properties of elastic and inelastic Isgur-Wise form
factors are reviewed. The nature of the "missing" exclusive semi-leptonic decay
fraction is identified. The role that completeness sum rules play in relating
form factors, spectroscopy, and model building is outlined.Comment: Latex2.09, uses sprocl.sty and epsf.sty. 10 pages with 3 postscript
files included. Talk presented at the Conference on B Physics and CP
Violation, March 24-27, 1997, Honolulu, Hawai
Universal Behavior in Excited Heavy-Light and Light-Light Mesons
A common pattern of large orbital and radial excitations in heavy-light and
light-light mesons is demonstrated. Within a general potential model the Regge
slopes of the light degrees of freedom for these mesons are shown to be in the
ratio of two. The possibility of ``tower'' degeneracy occurs only with pure
scalar confinement.Comment: Latex, 10 pages, 2 figures placed using epsf.sty. Z-compressed
postscript version available at
http://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-970.ps.Z or at
ftp://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-970.ps.
CONFINEMENT IN RELATIVISTIC POTENTIAL MODELS
In relativistic potential models of quarkonia based on a Dirac-type of
equation with a local potential there is a sharp distinction between a linear
potential V which is vector-like and one which is scalar-like: There are
normalizable solutions for a scalar-like V but not for a vector-like V. It is
pointed out that if instead one uses an equation of the no-pair type, which is
more natural from the viewpoint of field theory, this somewhat bizarre
difference disappears.Comment: LaTeX, 4 page
Semi-leptonic B decays into higher charmed resonances
We apply HQET to semi-leptonic meson decays into a variety of excited
charm states. Using three realistic meson models with fermionic light degrees
of freedom, we examine the extent that the sum of exclusive single charmed
states account for the inclusive semi-leptonic decay rate. The consistency
of form factors with the Bjorken and Voloshin sum rules is also investigated.Comment: Latex, 27 pages. A few references and errors corrected, to appear in
Phys. Rev.
From scalar to string confinement
We outline a connection between scalar quark confinement, a
phenomenologically successful concept heretofore lacking fundamental
justification, and QCD. Although scalar confinement does not follow from QCD,
there is an interesting and close relationship between them. We develop a
simple model intermediate between scalar confinement and the QCD string for
illustrative purposes. Finally, we find the bound state masses of scalar,
time-component vector, and string confinement analytically through
semi-classical quantization.Comment: ReVTeX, 9 pages, 5 figure
Observations On the Potential Confinement of a Light Fermion
We consider possible dynamical models for a light fermion confined by a
potential field. With the Dirac equation only Lorentz scalar confinement yields
normalizable wavefunctions, while with the ``no pair'' variant of the Dirac
equation only Lorentz vector confinement has normal Regge behaviour.
A systematic investigation of Regge properties and phenomenological
properties is carried out, including calculations of the Isgur-Wise function.
We point out that the Isgur-Wise function provides a sensitive test of
confinement models. In particular, the slope of the IW function at zero recoil
point is found to be for the Dirac equation with scalar
confinement, and for the no pair equation with vector
confinement. Using heavy-light data alone we argue against scalar confinement.Comment: Latex (uses epsf macro), 25 pages of text, 12 postscript figures
included. One reference is added and some typos are fixe
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