منابع مشابه
Dressed gluon exponentiation ∗
Perturbative and non-perturbative aspects of differential cross-sections close to a kinematic threshold are studied applying “dressed gluon exponentiation” (DGE). The factorization property of soft and collinear gluon radiation is demonstrated using the light-cone axial gauge: it is shown that the singular part of the squared matrix element for the emission of an off-shell gluon off a nearly on...
متن کاملTaming the B̄ −→ Xsγ spectrum by Dressed Gluon Exponentiation
We show that the B̄ −→ Xsγ photon energy (Eγ) spectrum can be reliably computed by resummed perturbation theory. Our calculation is based on Dressed Gluon Exponentiation (DGE) incorporating Sudakov and renormalon resummation. It is shown that the resummed spectrum does not have the perturbative support properties: it smoothly extends to the non-perturbative region Eγ > m/2, where m is the quark ...
متن کاملResummation and Power Corrections by Dressed Gluon Exponentiation
Event-shape distributions in ee annihilation offer a unique laboratory for understanding perturbative and non-perturbative aspects of QCD. Dressed Gluon Exponentiation is a resummation method designed to evaluate differential cross sections close to a kinematic threshold and provide the basis for parametrization of power corrections. The method and its application in the case of the thrust and ...
متن کاملInclusive spectra in charmless semileptonic B decays by Dressed Gluon Exponentiation
The triple differential spectrum in B̄ −→ Xulν̄ is computed by Dressed Gluon Exponentiation (DGE). In this framework the on-shell calculation, converted into hadronic variables, can be directly used as an approximation to the meson decay spectrum, without involving a leading–power non-perturbative function. Sudakov resummation for the fully differential B̄ −→ Xulν̄ width is formulated in moment spa...
متن کاملSoft Gluon Exponentiation and Resummation
of the Dissertation Soft Gluon Exponentiation and Resummation by Carola Friederike Berger Doctor of Philosophy in Physics State University of New York at Stony Brook 2003 In calculations of (semi-) inclusive events within perturbative Quantum Chromodynamics, large logarithmic corrections arise from certain kinematic regions of interest which need to be resummed. When resumming soft gluon effect...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2002
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(01)00594-6