1,669 research outputs found
Light-front field theory of hot and dense quark matter
Extending the concepts of light-front field theory to quantum statistics
provides a novel approach towards nuclear matter under extreme conditions. Such
conditions exist, e.g., in neutron stars or in the early stage of our universe.
They are experimentally expected to occur in heavy ion collisions, e.g., at
RHIC and accelerators to be build at GSI and CERN. Light-front field theory is
particularly suited, since it is based on a relativistic Hamiltonian approach.
It allows us to treat the perturbative as well as the nonperturbative regime of
QCD and also correlations that emerge as a field of few-body physics and is
important for hadronization. Last but not least the Hamiltonian approach is
useful for nonequilibrium processes by utilizing, e.g., the formalism of
nonequilibrium statistical operators.Comment: 6 pages, talk presented at Light-Cone 2004, Amsterdam, 16 - 20 Augus
Quark Structure and Weak Decays of Heavy Mesons
We investigate the quark structure of D and B mesons in the framework of a
constituent quark model. To this end, we assume a scalar confining and a one
gluon exchange (OGE) potential. The parameters of the model are adopted to
reproduce the meson mass spectrum. From a fit to ARGUS and CLEO data on B->D*lv
semileptonic decay we find for the Cabbibo Kobayashi Maskawa matrix element
Vcb=0.036+-0.003. We compare our form factors to the pole dominance hypothesis
and the heavy quark limit. For non-leptonic decays we utilize factorization and
for B->D*X decays we find a1 = 0.96+-0.05, and a2=0.31+-0.03.Comment: LATEX, 26 pages, 12 tables, 6 figures (appended as uuencoded file but
also available as postscript files from the authors), BONN TK-93-1
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