Naslov
Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond

Autori
Kumerički, Krešimir ; Müller, Dieter ; Passek- Kumerički, Kornelija

Izvornik
Nuclear physics. B (0550-3213) 794 (2008), 1/2; 244-323

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
deeply virtual Compton scattering; next-to-next-to-leading order corrections; fitting procedure; generalized parton distributions; conformal symmetry

Sažetak
Combining dispersion and operator product expansion techniques, we derive the conformal partial wave decomposition of the virtual Compton scattering amplitude in terms of complex conformal spin to twist-two accuracy. The perturbation theory predictions for the deeply virtual Compton scattering (DVCS) amplitude are presented in next- to-leading order for both conformal and modified minimal subtraction scheme. Within a conformal subtraction scheme, where we exploit predictive power of conformal symmetry, the radiative corrections are presented up to next-to-next-to- leading order accuracy. Here, because of the trace anomaly, the mixing of conformal moments of generalized parton distributions (GPD) at the three-loop level remains unknown. Within a new proposed parameterization for GPDs, we then study the convergence of perturbation theory and demonstrate that our formalism is suitable for a fitting procedure of DVCS observables.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
[arXiv:hep-ph/0703179]

POVEZANOST RADA