Neutral pion electroproduction in the resonance region at high Q2

The process ep {yields} ep{pi}{sup 0} has been measured at Q{sup 2} = 6.4 and 7.7 (GeV/c{sup 2}){sup 2} in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center-of-mass frame considering the process {gamma}*p {yields} p{pi}{sup 0}. Vari...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2009-09, Vol.80 (3)
Main Authors: Villano, A. N., Stoler, P., Bosted, P. E., Connell, S. H., Dalton, M. M., Jones, M. K., Kubarovsky, V., Adams, G. S., Ahmidouch, A., Arrington, J., Asaturyan, R., Baker, O. K., Breuer, H., Christy, M. E., Danagoulian, S., Day, D., Dunne, J. A., Dutta, D., Ent, R., Fenker, H. C., Frolov, V. V., Gan, L., Gaskell, D., Hinton, W., Holt, R. J., Horn, T., Huber, G. M., Joo, K., Kalantarians, N., Keppel, C. E., Li, Y., Lung, A., Mack, D., Malace, S., Markowitz, P., Meekins, D. G., Mkrtchyan, H., Napolitano, J., Niculescu, G., Niculescu, I., Potterveld, D. H., Reimer, Paul E., Reinhold, J., Roche, J., Rock, S. E., Smith, G. R., Stepanyan, S., Tadevosyan, V., Tvaskis, V., Ungaro, M., Uzzle, A., Vidakovic, S., Wesselmann, F. R., Wojtsekhowski, B., Wood, S. A., Yuan, L., Zheng, X., Zhu, H.
Format: Article
Language:English
Subjects:
DIFFERENTIAL CROSS SECTIONS
ELECTROPRODUCTION
FORM FACTORS
MOMENTUM TRANSFER
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS
RADIATIVE CORRECTIONS
RESONANCE
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Summary:The process ep {yields} ep{pi}{sup 0} has been measured at Q{sup 2} = 6.4 and 7.7 (GeV/c{sup 2}){sup 2} in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center-of-mass frame considering the process {gamma}*p {yields} p{pi}{sup 0}. Various details relating to the background subtractions, radiative corrections, and systematic errors are discussed. The usefulness of the data with regard to the measurement of the electromagnetic properties of the well-known {Delta}(1232) resonance is covered in detail. Specifically considered are the electromagnetic and scalar-magnetic ratios R{sub EM} and R{sub SM} along with the magnetic transition form factor G*{sub M}. It is found that the rapid falloff of the {Delta}(1232) contribution continues into this region of momentum transfer and that other resonances may be making important contributions in this region.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.80.035203