Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-03
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, contribution to XIth International Conference on Elastic and Diffractive Scattering, Chateau de Blois, France, May 15
Scientific paper
Analytic properties of hard exclusive processes described by Generalized Parton Distributions (GPD's) are considered. The analytic continuation of GPD is provided by Generalized Distribution Amplitudes (GDA). The GDA's for the production of two $\rho-$mesons may give an access to four-quark exotic states. The crucial role in the proof of analyticity is played by the Cavalieri conditions (polynomiality), resulting in the "holographic" property of GPD, when the full information about various hard processes is contained in the one dimensional sections ($x=\pm \xi$)of GPD. The applicability of analyticity for description of the double diffractive production of dileptons and Higgs bosons is discussed.
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