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10 papers · 2 filters
Hard Exclusive Electroproduction of Pions
L. Mankiewicz, G. Piller, A. Radyushkin
We investigate the exclusive electroproduction of pi^+ mesons from nucleons. To leading twist, leading order alpha_s accuracy the corresponding production amplitude can be decompos…
Factorization and high-energy effective action
Ian Balitsky
I demonstrate that the amplitude for high-energy scattering can be factorized as a convolution of the contributions due to fast and slow fields. The fast and slow fields interact b…
Sudakov suppression in the soft heavy to light meson transition form factor
Adam P. Szczepaniak, Anatoly Radyushkin
We calculate hard gluon contribution to the decay vertex that determines the heavy-to-light meson transition form factor at large recoil. It is found that resulting Sudakov suppres…
Symmetries and structure of skewed and double distributions
A. V. Radyushkin
Extending the concept of parton densities onto nonforward matrix elements <p'|O(0,z)|p> of quark and gluon light-cone operators, one can use two types of nonperturbative functions:…
QCD sum rules and soft-hard interplay for hadronic form factors
A. V. Radyushkin
We discuss two types of contributions to hadronic form factors in QCD: hard gluon exchange and soft wave function overlap. Within the QCD sum rule approach, the hard contribution h…
A relativistic chiral quark model for pseudoscalar emission from heavy mesons
J. L. Goity, W. Roberts
The amplitudes for one-pion mediated transitions between heavy meson excited states are obtained in the framework of the relativistic chiral quark model. The effective coupling con…