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Illuminating the 1/x moment of parton distribution functions · Around

2007

Illuminating the 1/x moment of parton distribution functions

Brodsky, Stanley J., Llanes-Estrada, Felipe J., Szczepaniak, Adam P.

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The Weisberger relation, an exact statement of the parton model, elegantly relates a high-energy physics observable, the 1/x moment of parton distribution functions, to a nonperturbative low-energy observable: the dependence of the nucleon mass on the value of the quark mass or its corresponding quark condensate.

We show that contemporary fits to nucleon structure functions fail to determine this 1/x moment; however, deeply virtual Compton scattering can be described in terms of a novel F_{1/x}(t) form factor which illuminates this physics.
An analysis of exclusive photon-induced processes in terms of the parton-nucleon scattering amplitude with Regge behavior reveals a failure of the high Q^2 factorization of exclusive processes at low t in terms of the Generalized Parton-Distribution Functions which has been widely believed to hold in the past.
We emphasize the need for more data for the DVCS process at large t in future or upgraded facilities.

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