München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 34: Elektromagnetische und Hadronische Sonden

HK 34.6: Vortrag

Mittwoch, 22. März 2006, 18:15–18:30, F

BLM Renormalization Scale-Fixing for Complex Scattering Amplitudes — •Felipe J. Llanes-Estrada¹ and Stanley J. Brodsky² — ¹Depto. Fisica Teorica I, Universidad Complutense de Madrid, 28040 Madrid, Spain — ²Theory Group, Stanford Linear Accelerator Center, 94025 Menlo Park, CA, USA

We show how to fix the BLM renormalization scale for hard-scattering exclusive processes such as deeply virtual meson electroproduction by applying the BLM prescription to the imaginary part of the scattering amplitude, and employing a fixed-t dispersion relation to obtain the real part. In this way we resolve the ambiguity in BLM renormalization scale-setting for complex amplitudes. For this purpose we compute the H Generalized Parton Distribution in the perturbative quark-diquark model for the parton-proton scattering amplitude.