On BLM scale fixing in exclusive processes

I.V. Anikin (1, 2) , B. Pire (3) , L. Szymanowski (4, 5) , O.V. Teryaev (1) , S. Wallon (2)

1 BLTP - Bogoliubov Laboratory of Theoretical Physics [Dubna]
2 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
3 CPHT - Centre de Physique Théorique [Palaiseau]
4 Soltan Institute for Nuclear Studies
5 IFPA - Interactions Fondamentales en Physique et en Astrophysique

We discuss the BLM scale fixing procedure in exclusive electroproduction processes in the Bjorken regime. We show that in the case of vector meson production the usual way to aplly the BLM method fails due to singularities present in equations fixing the BLM scale. We argue that the BLM scale should be extracted from the squared amplitudes which are directly related to observables.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

I.V. Anikin, B. Pire, L. Szymanowski, O.V. Teryaev, S. Wallon. On BLM scale fixing in exclusive processes. 2004. ⟨hal-00003431v1⟩