Scaling study of the pion electroproduction cross sections

T. Horn, X. Qian, J. Arrington, R. Asaturyan, F. Benmokthar, W. Boeglin, P. Bosted, A. Bruell, M. E. Christy, E. Chudakov, B. Clasie, M. M. Dalton, A. Daniel, D. Day, D. Dutta, L. El Fassi, R. Ent, H. Fenker, J. Ferrer, N. FominH. Gao, K. Garrow, D. Gaskell, C. Gray, G. M. Huber, M. K. Jones, N. Kalantarians, C. E. Keppel, K. Kramer, Y. Li, Y. Liang, A. F. Lung, S. Malace, P. Markowitz, A. Matsumura, D. Meekins, T. Mertens, T. Miyoshi, H. Mkrtchyan, R. Monson, T. Navasardyan, G. Niculescu, I. Niculescu, Y. Okayasu, A. K. Opper, C. Perdrisat, V. Punjabi, A. W. Rauf, V. Rodriguez, D. Rohe, J. Seely, E. Segbefia, G. R. Smith, M. Sumihama, V. Tadevosyan, L. G. Tang, V. Tvaskis, A. Villano, W. Vulcan, F. R. Wesselmann, S. A. Wood, L. Yuan, X. C. Zheng

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The 1H(e,e'π+)n cross section was measured for arange of four-momentum transfer up to Q2=3.91 GeV2 at values of the invariant mass W above the resonance region. The Q2 dependence of the longitudinal component was found to be consistent with the Q2-scaling prediction for hard exclusive processes. This suggests that the QCD factorization theorem is applicable at rather low values of Q2. The transverse term falls off slower than the naive Q-8 expectation and remains appreciable even at Q2=3.91 GeV2.

Original languageEnglish (US)
Article number058201
JournalPhysical Review C - Nuclear Physics
Issue number5
StatePublished - Nov 18 2008

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