E1D and E6A runs CLAS data

Spokesperson

M. Osipenko

Year

2005

Abstract

The inclusive electron scattering off the deuteron has been measured at Jefferson Lab with CLAS detector. The measurement covers the entire resonance region beginning from the quasi-elastic peak up to W ~ 2.7 GeV at four-momentum transfers Q2 from 0.4 to 6 (GeV/c)^2. These data are complementary to the previous measurement of the proton structure function F2 and cover a similar two-dimensional region of Q2 and x. Simultaneous determination of the deuteron F2 in a large x interval including quasi-elastic peak, for each fixed Q2, together with other world data permitted for the first time a direct evaluation of the structure function moments. Fitting the Q2 evolution of these moments with OPE based twist expansion we obtained a separation of the Leading Twist and Higher Twist terms. Observed Q2 behaviour of the higher twist contribution suggests a partial cancellation of twist-4 and twist-6 terms entering in the expansion with opposite signs. This cancellation found also in the proton moments is responsible for "duality" phenomenon in F2 structure function.

Publications

1. M. Osipenko, G. Ricco, S. Simula, M. Battaglieri, M. Ripani, and CLAS Collaboration Measurement of the Deuteron Structure Function F2 in the Resonance Region and Evaluation of Its Moments // hep-ex/0506004
2. M. Osipenko, G. Ricco, S. Simula, M. Battaglieri, M. Ripani, and CLAS Collaboration The deuteron structure function F2 with CLAS // CLAS-NOTE 2005-013 and hep-ex/0507098

Quantities

F₂

Measurements