Single spin asymmetries in elastic ep-scattering with transverse spin

por Mikhail Gorshteyn (Universitá di Genova)

jueves 2 dic. 2004 12:00 → 13:00 Europe/Madrid

Sala Seminarios (Dpto. de Física Teórica (UVEG))

The asymmetries in ep-scattering allow one to access the imaginary part of the doubly virtual Compton scattering amplitude. At high energy and momentum, the latter can be described in terms of the Generalized Parton Distributions.I present a handbag calculation for the beam normal spin asymmetry B_n, discuss the validity of the equivalent photon approximation for this observable and show that this asymmetry gives a unique possibility to access the helicity-flip gluon GPDs.