22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

Exclusive processes beyond leading twist: gamma*T -> rhoT impact factor with twist three accuracy

23 Jul 2010, 11:50
Salle 252B

Salle 252B

Parallel Session Talk 03 - Perturbative QCD, Jets and Diffractive Physics 03 - Perturbative QCD, Jets and Diffractive Physics


Lech Szymanowski (Soltan INS, Warsaw)


We describe a consistent approach to factorization of scattering amplitudes for exclusive processes beyond the leading twist approximation. The method is based on the Taylor expansion of the scattering amplitude in the momentum space around the dominant light-cone direction and thus naturally introduces an appropriate set of non-perturbative correlators which encode effects not only of the lowest but also of the higher Fock states of the produced particle. The reduction of original set of correlators to a set of independent ones is achieved with the help of equations of motion and invariance of the scattering amplitude under rotation on the light-cone. As a concrete application, we compute the expressions of the impact factor for the transition of virtual photon to transversally polarised rho-meson up to the twist 3 accuracy. (Phys.Lett.B682:413-418,2010 and Nucl.Phys.B828:1-68,2010.)

Primary author

Lech Szymanowski (Soltan INS, Warsaw)


Bernard Pire (CPHT Ecole Polytechnique) Dmitry Yu Ivanov (Inst. of Mathematics, Novosibirsk) Igor V Anikin (JINR, Dubna) Samuel Wallon (LPT, Univ. Paris-Sud, Orsay)

Presentation Materials