Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
Proceedings of the 10th Lomonosov Conference on Elementary Particle Physics, 21-27 August 2003, Moscow, Russia
Scientific paper
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)^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.
Fedotov G. G.
Golovach Evgeny
Ishkhanov Boris
Isupov Evgeny
Mokeev Victor
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