منابع مشابه
- th / 9 71 10 23 v 1 1 2 N ov 1 99 7 Preprint Numbers
Semileptonic heavy → heavy and heavy → light meson transitions are studied as a phenomenological application of a heavy-quark limit of Dyson-Schwinger equations. Employing two parameters: E, the difference between the mass of the heavy meson and the effective-mass of the heavy quark; and Λ, the width of the heavy-meson Bethe-Salpeter amplitude, we calculate f+(t) for all decays on their entire ...
متن کامل$n$-cocoherent rings, $n$-cosemihereditary rings and $n$-V-rings
Let $R$ be a ring, and let $n, d$ be non-negative integers. A right $R$-module $M$ is called $(n, d)$-projective if $Ext^{d+1}_R(M, A)=0$ for every $n$-copresented right $R$-module $A$. $R$ is called right $n$-cocoherent if every $n$-copresented right $R$-module is $(n+1)$-coprese-nted, it is called a right co-$(n,d)$-ring if every right $R$-module is $(n, d)$-projective. $R$...
متن کامل/ 02 01 23 9 v 1 2 9 Ja n 20 02 Boundary conditions in charge conjugate sl ( N ) WZW theories
We compute the representations (" nim-reps ") of the fusion algebra of sl(N) which determine the boundary conditions of sl(N) WZW theories twisted by the charge conjugation. This is done following two procedures, one of general validity, the other specific to the problem at hand. The problem is related to the classical problem of decomposition of the fundamental representations of sl(N) onto re...
متن کاملar X iv : h ep - p h / 99 11 23 7 v 1 4 N ov 1 99 9 QCD
Nonperturbative QCD approach is systematically derived starting from the QCD Lagrangian. Treating spin effects as a perturbation, one obtains the universal effective Hamiltonian describing mesons, hybrids and glueballs. Constituent mass of quark and gluon is calculated via string tension. The resulting spectrum of mesons, hybrids and glueballs obtained is in good overall agreement with lattice ...
متن کاملWednesday Slide Conference 2010 - 2011 Conference 21 23 February 2011
Histopathologic Description: Cervical spinal cord: Microscopically, the lesions are characterized by a loss of myelin visible on HE-stained sections where the normally intense eosinophilia of the white matter is lost and the neuropil to has a fine fibrillar meshwork pattern dotted with numerous oligodendrocyte nuclei. With the Luxol fast blue stain, the deep blue color of the white matter is re...
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ژورنال
عنوان ژورنال: HORIZONTE
سال: 2011
ISSN: 2175-5841,1679-9615
DOI: 10.5752/2806