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Illuminating the 1/chi Moment of Parton Distribution Functions.

DE2007918020

Publication Date	2007
Personal Author	Brodsky, S. J.; Llanes-Estrada, F. J.; Szczepaniak, A. P.
Page Count	11
Abstract	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 F1/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 Q2 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.
Keywords	Partons Distribution functions High energy physics Nucleons Mass Quarks Photons Compton effect Scattering Form factors Factorization
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, Menlo Park.; Universidad Complutense de Madrid (Spain). Dept. de Fisica Teorica.; Indiana Univ. at Bloomington. Nuclear Theory Center.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Universidad Complutense de Madrid (Spain). Dept. de Fisica Teorica. and Indiana Univ. at Bloomington. Nuclear Theory Center. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200806

Illuminating the 1/chi Moment of Parton Distribution Functions.

Illuminating the 1/chi Moment of Parton Distribution Functions.
DE2007918020

Publication Date	2007
Personal Author	Brodsky, S. J.; Llanes-Estrada, F. J.; Szczepaniak, A. P.
Page Count	11
Abstract	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 F1/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 Q2 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.
Keywords	Partons Distribution functions High energy physics Nucleons Mass Quarks Photons Compton effect Scattering Form factors Factorization
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, Menlo Park.; Universidad Complutense de Madrid (Spain). Dept. de Fisica Teorica.; Indiana Univ. at Bloomington. Nuclear Theory Center.; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Universidad Complutense de Madrid (Spain). Dept. de Fisica Teorica. and Indiana Univ. at Bloomington. Nuclear Theory Center. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200806