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Evaluation of the Higher Twist Contribution to the Moments of Proton Structure Functions F2 and G1.

DE2005836845

Publication Date	2005
Personal Author	Osipenko, M.; Simula, S.; Ricco, G.; Fedotov, G.
Page Count	10
Abstract	We performed the measurement of the inclusive electron scattering off the proton in the resonance region (W<2.5 GeV) at momentum transfer Q2 below 4.5 (GeV/c)(sup 2) with the CLAS detector. The large acceptance of CLAS provided an access to a large, continuous two-dimensional kinematic domain in Q2 and x, allowing therefore an integration of the data at fixed Q2 over x-interval. The covered x-interval at each measured Q2 value is sufficient for an evaluation of the higher moments (n>2). From these data we extracted the structure function F2 and, by including other world data, we studied the Q2 evolution of its moments, Mn(Q2), in order to estimate the higher twist contributions. A similar experiment with polarized proton target is completed at CLAS. These new data allow an accurate determination of higher moments of the proton structure function g1. A preliminary phenomenological analysis indicates an excess of the higher twist contribution in the spin-dependent structure function with respect to the spin-independent one.
Keywords	Protons Elementary particles Resonance Momentum transfer Electrons Scattering Structure functions Targets
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Istituto Nazionale di Fisica Nucleare, Rome (Italy).; Department of Energy, Washington, DC.; Thomas Jefferson National Accelerator Facility, Newport News, VA.
Supplemental Notes	Prepared in cooperation with Thomas Jefferson National Accelerator Facility, Newport News, VA. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200520

Evaluation of the Higher Twist Contribution to the Moments of Proton Structure Functions F2 and G1.

Evaluation of the Higher Twist Contribution to the Moments of Proton Structure Functions F2 and G1.
DE2005836845

Publication Date	2005
Personal Author	Osipenko, M.; Simula, S.; Ricco, G.; Fedotov, G.
Page Count	10
Abstract	We performed the measurement of the inclusive electron scattering off the proton in the resonance region (W<2.5 GeV) at momentum transfer Q2 below 4.5 (GeV/c)(sup 2) with the CLAS detector. The large acceptance of CLAS provided an access to a large, continuous two-dimensional kinematic domain in Q2 and x, allowing therefore an integration of the data at fixed Q2 over x-interval. The covered x-interval at each measured Q2 value is sufficient for an evaluation of the higher moments (n>2). From these data we extracted the structure function F2 and, by including other world data, we studied the Q2 evolution of its moments, Mn(Q2), in order to estimate the higher twist contributions. A similar experiment with polarized proton target is completed at CLAS. These new data allow an accurate determination of higher moments of the proton structure function g1. A preliminary phenomenological analysis indicates an excess of the higher twist contribution in the spin-dependent structure function with respect to the spin-independent one.
Keywords	Protons Elementary particles Resonance Momentum transfer Electrons Scattering Structure functions Targets
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Istituto Nazionale di Fisica Nucleare, Rome (Italy).; Department of Energy, Washington, DC.; Thomas Jefferson National Accelerator Facility, Newport News, VA.
Supplemental Notes	Prepared in cooperation with Thomas Jefferson National Accelerator Facility, Newport News, VA. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200520