Scaling study of the pion electroproduction cross sections

The {sup 1}H(e, e{sup '}{pi}{sup +})n cross section was measured for arange of four-momentum transfer up to Q{sup 2}=3.91 GeV{sup 2} at values of the invariant mass W above the resonance region. The Q{sup 2} dependence of the longitudinal component was found to be consistent with the Q{sup 2}-s...

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Veröffentlicht in:	Physical review. C, Nuclear physics Nuclear physics, 2008-11, Vol.78 (5), Article 058201
Hauptverfasser:	Horn, T., Qian, X., Arrington, J., Asaturyan, R., Benmokthar, F., Boeglin, W., Bosted, P., Bruell, A., Christy, M. E., Chudakov, E., Clasie, B., Dalton, M. M., Daniel, A., Day, D., Dutta, D., El Fassi, L., Ent, R., Fenker, H., Ferrer, J., Fomin, N., Gao, H., Garrow, K., Gaskell, D., Gray, C., Huber, G. M., Jones, M. K., Kalantarians, N., Keppel, C. E., Kramer, K., Li, Y., Liang, Y., Lung, A. F., Malace, S., Markowitz, P., Matsumura, A., Meekins, D., Mertens, T., Miyoshi, T., Mkrtchyan, H., Monson, R., Navasardyan, T., Niculescu, G., Niculescu, I., Okayasu, Y., Opper, A. K., Perdrisat, C., Punjabi, V., Rauf, A. W., Rodriguez, V., Rohe, D., Seely, J., Segbefia, E., Smith, G. R., Sumihama, M., Tadevosyan, V., Tang, L. G., Tvaskis, V., Villano, A., Vulcan, W., Wesselmann, F. R., Wood, S. A., Yuan, L., Zheng, X. C.
Format:	Artikel
Sprache:	eng
Schlagworte:	CROSS SECTIONS ELECTRON BEAMS ELECTROPRODUCTION FACTORIZATION FORECASTING FOUR MOMENTUM TRANSFER HYDROGEN 1 TARGET MASS NEUTRONS NUCLEAR PHYSICS AND RADIATION PHYSICS PIONS QUANTUM CHROMODYNAMICS RESONANCE SCALING
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Zusammenfassung:	The {sup 1}H(e, e{sup '}{pi}{sup +})n cross section was measured for arange of four-momentum transfer up to Q{sup 2}=3.91 GeV{sup 2} at values of the invariant mass W above the resonance region. The Q{sup 2} dependence of the longitudinal component was found to be consistent with the Q{sup 2}-scaling prediction for hard exclusive processes. This suggests that the QCD factorization theorem is applicable at rather low values of Q{sup 2}. The transverse term falls off slower than the naive Q{sup -8} expectation and remains appreciable even at Q{sup 2}=3.91 GeV{sup 2}.
ISSN:	0556-2813 1089-490X
DOI:	10.1103/PhysRevC.78.058201