Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-08
Phys.Rev.Lett. 92 (2004) 012003
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 4 figures; new references and figure added, errors corrected
Scientific paper
10.1103/PhysRevLett.92.012003
In the large momentum transfer limit, generalized parton distributions can be calculated through a QCD factorization theorem which involves perturbatively-calculable hard kernels and light-cone parton distribution amplitudes of hadrons. We illustrate this through the $H_q(x,\xi,t)$ distribution for the pion and proton, presenting the hard kernels at leading order. As a result, experimental data on the generalized parton distributions in this regime can be used to determine the functional form of the parton distribution amplitudes which has thus far been quite challenging to obtain. Our result can also be used as a constraint in phenomenological GPD parametrizations.
Hoodbhoy Pervez
Ji Xiangdong
Yuan Fang-Fang
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