Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Elektromagnetische und Hadronische Sonden
HK 23.4: Talk
Tuesday, March 11, 2008, 12:00–12:15, 1C
J=0 fixed pole in Deeply Virtual Compton Scattering — •Felipe J. Llanes Estrada1, Stanley J. Brodsky2, and Adam P. Szczepaniak3 — 1Depto. Fisica Teorica I, Universidad Complutense Madrid, 28040 Madrid Spanien — 2Stanford Linear Accelerator Center, 94025 Menlo Park, California, USA — 3Nuclear Theory Center, Indiana University, 47408 Bloomington, Indiana, USA
We argue that the experimental effort in Deeply Virtual Compton Scattering should focuse on extracting the so-called J=0 fixed pole in the Regge limit (large s at fixed, sizeable -t and photon virtuality). This is because the fixed pole is the most characteristic feature of the handbag diagram in (non-singlet) DVCS, asymptotically identifiable by increasing s, and therefore gives a window to the theoretically interesting 1/x moment of Generalized Parton Distribution Functions. Its contribution to the Compton amplitude is s-independent for any -t (hence the name Fixed Pole). We also briefly comment on theoretical issues regarding singularities and factorization in the theory of Generalized Parton Distribution Functions.
References: Eur.Phys.J.C46:751,2006, and arXiv:0710.0981 [nucl-th],