Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-01-23
Phys.Rev.D67:092001,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
revtex4 18 pp., 12 figures
Scientific paper
10.1103/PhysRevD.67.092001
We measured the inclusive electron-proton cross section in the nucleon resonance region (W < 2.5 GeV) at momentum transfers Q**2 below 4.5 (GeV/c)**2 with the CLAS detector. The large acceptance of CLAS allowed for the first time the measurement of the cross section in a large, contiguous two-dimensional range of Q**2 and x, making it possible to perform an integration of the data at fixed Q**2 over the whole significant x-interval. From these data we extracted the structure function F2 and, by including other world data, we studied the Q**2 evolution of its moments, Mn(Q**2), in order to estimate higher twist contributions. The small statistical and systematic uncertainties of the CLAS data allow a precise extraction of the higher twists and demand significant improvements in theoretical predictions for a meaningful comparison with new experimental results.
Osipenko Mikhail
Ricco Giovanni
Ripani Marco
Simula Silvano
Taiuti Martina
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