Naslov
Sum rules and dualities for generalized parton distributions : is there a holographic principle?

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

Izvornik
European physical journal C : particles and fields (1434-6044) 58 (2008), 2; 193-215

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

Ključne riječi
generalized parton distributions ; deeply virtual Compton scattering ; sum rules ; duality

Sažetak
To leading order approximation, the physical content of generalized parton distributions (GPDs) that is accessible in deep virtual electroproduction of photons or mesons is contained in their value on the cross-over trajectory. This trajectory separates the t-channel and s-channel dominated GPD regions. The underlying Lorentz covariance implies a correspondence between these two regions through their relation to GPDs on the cross-over trajectory. This point of view leads to a family of GPD sum rules which are a quark analogue of finite energy sum rules and it guides us to a new phenomenological GPD concept. As an example, we discuss the constraints from the JLab/Hall A data on the dominant u-quark GPD H. The question arises whether GPDs are governed by some kind of holographic principle.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA