منابع مشابه
On the Higher Order Corrections to Heavy Quark Effective Theory
We show that the different ways of deriving the Heavy Quark Effective Theory (HQET) lead to equivalent theories. The equivalence can be established through a careful redefinition of the field variables. We demonstrate the equivalence to order 1 m in the presence of a constant electric field.
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The notion of generalised structure groups and generalised holonomy groups has been introduced in supergravity, in order to discuss the spinor rotations generated by commutators of supercovariant derivatives when non-vanishing form fields are included, with their associated gamma-matrix structures that go beyond the usual ΓMN of the Riemannian connection. In this paper we investigate the genera...
متن کاملHigher order 1/m corrections at zero recoil.
The general structure of the 1/m corrections at zero recoil is studied. The relevant matrix elements are forward matrix elements of local higher dimensional operators and their time ordered products with higher order terms from the Lagrangian. These matrix elements may be classified in a simple way and the analysis at the non recoil point for the form factor of heavy quark currents simplifies d...
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Nonleading QCD corrections to e+eannihilation into hadrons are computed. Comparison with experiment is briefly discussed. (Submitted to Phys. Rev. Letters) * Work supported by the Department of Energy under contract number DE-AC03-76SF00515. ** Address after July 1, 1979: University of California at Los Angeles, Physics Department, Los Angeles, California 90024.
متن کاملSupersymmetric Deformations of G2 Manifolds from Higher-Order Corrections to String and M-Theory
The equations of 10 or 11 dimensional supergravity admit supersymmetric compactifications on 7-manifolds of G2 holonomy, but these supergravity vacua are deformed away from special holonomy by the higher-order corrections of string or M-theory. We find simple expressions for the first-order corrections to the Einstein and Killing spinor equations in terms of the calibrating 3-form of the leadin...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2003
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2003/09/038