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Factorization and Momentum-Space Resummation in Deep-Inelastic Scattering

Description: Renormalization-group methods in soft-collinear effective theory are used to perform the resummation of large perturbative logarithms for deep-inelastic scattering in the threshold region x {yields} 1. The factorization theorem for the structure function F{sub 2}(x,Q{sup 2}) for x {yields} 1 is rederived in the effective theory, whereby contributions from the hard scale Q{sup 2} and the jet scale Q{sup 2}(1 - x) are encoded in Wilson coefficients of effective-theory operators. Resummation is ac… more
Date: July 1, 2006
Creator: Becher, Thomas; Neubert, Matthias & Pecjak, Ben D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis of Br(anti-B ---> X(s gamma)) at NNLO With a Cut on Photon Energy

Description: By combining a recent estimate of the total {bar B} {yields} X{sub s}{gamma} branching fraction at O({alpha}{sub s}{sup 2}) with a detailed analysis of the effects of a cut E{sub {gamma}} {ge} 1.6 GeV on photon energy, a prediction for the partial {bar B} {yields} X{sub s}{gamma} branching fraction at next-to-next-to-leading order in renormalization-group improved perturbation theory is obtained, in which contributions from all relevant scales are properly factorized. The result Br({bar B} {yie… more
Date: October 1, 2006
Creator: Becher, Thomas & Neubert, Matthias
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Factorization in B ---> V Gamma Decays

Description: The factorization properties of the radiative decays B {yields} V{gamma} are analyzed at leading order in 1/m{sub b} using the soft-collinear effective theory. It is shown that the decay amplitudes can be expressed in terms of a B {yields} V form factor evaluated at q{sup 2} = 0, light-cone distribution amplitudes of the B and V mesons, and calculable hard-scattering kernels. The renormalization-group equations in the effective theory are solved to resum perturbative logarithms of the different… more
Date: March 1, 2005
Creator: Becher, Thomas; Hill, Richard J. & Neubert, Matthias
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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