منابع مشابه
The Gluon Spin in the Chiral Bag Model
We study the gluon polarization contribution at the quark model renormalization scale to the proton spin, Γ, in the chiral bag model. It is evaluated by taking the expectation value of the forward matrix element of a local gluon operator in the axial gauge A = 0. It is shown that the confining boundary condition for the color electric field plays an important role. When a solution satisfying th...
متن کاملThe Proton Spin Problem in the Chiral Bag Model
The flavor singlet axial charge has been a source of study in the last years due to its relation to the so called Proton Spin Problem. The relevant flavor singlet axial current is anomalous, i.e., its divergence contains a piece which is the celebrated UA(1) anomaly. This anomaly is intimately associated with the η ′ meson, which gets its mass from it. When the gauge degrees of freedom of QCD a...
متن کاملChiral Bag Boundary Conditions on the Ball
Local boundary conditions for spinor fields are expressed in terms of a 1parameter family of boundary operators, and find applications ranging from (supersymmetric) quantum cosmology to the bag model in quantum chromodynamics. The present paper proves that, for massless spinor fields on the Euclidean ball in dimensions d = 2, 4, 6, the resulting ζ(0) value is independent of such a θ parameter, ...
متن کاملStability theorems for chiral bag boundary conditions
We study asymptotic expansions of the smeared L2-traces Fe−tP 2 and FPe−tP 2 , where P is an operator of Dirac type and F is an auxiliary smooth endomorphism. We impose chiral bag boundary conditions depending on an angle θ. Studying the θ-dependence of the above trace invariants, θindependent pieces are identified. The associated stability theorems allow one to show the regularity of the eta f...
متن کاملBag formation in Chiral Born-Infeld Theory
The ”bag”-like spherically symmetrical solutions of the Chiral Born-Infeld theory are studied. The properties of these solutions are obtained, and a possible physical interpretation is also discussed. PACS number(s): 12.39.Dc, 12.39.Fe, 05.45.Yv, 11.27.+d, 11.30.Qc
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2002
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.65.045203