Deeply virtual and exclusive electroproduction of ω-mesons

Morand, L. et al. (2005) Deeply virtual and exclusive electroproduction of ω-mesons. European Physical Journal A, 24(3), pp. 445-458. (doi: 10.1140/epja/i2005-10032-4)

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The exclusive ω electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q<sup>2</sup>) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross-sections were measured up to large values of the four-momentum transfer (- t < 2.7 GeV<sup>2</sup>) to the proton. The contributions of the interference terms σ<sub>{TT}</sub> and σ<sub>{TL}</sub> to the cross-sections, as well as an analysis of the ω spin density matrix, indicate that helicity is not conserved in this process. The t-channel π<sup>0</sup> exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction γ* p↦ωp, even for Q<sup>2</sup> as large as 5 GeV<sup>2</sup>. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross-sections is nearly Q<sup>2</sup>-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.

Item Type:Articles
Glasgow Author(s) Enlighten ID:McKinnon, Dr Bryan and Livingston, Dr Kenneth and Protopopescu, Dr Dan and Ireland, Professor David and Kellie, Dr James and Rosner, Professor Guenther
Authors: Morand, L., Dore, D., Garcon, M., Guidal, M., Laget, J., Morrow, S., Sabatie, F., Smith, E., Adams, G., Arnbrozewicz, P., Anghinolfi, M., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Ball, J., Ball, J., Baltzell, N., Barrow, S., Batourine, V., Battaglieri, M., Bektasoglu, M., Bellis, M., Benmouna, N., Berman, B., Biselli, A., Boiarinov, S., Bonner, B., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W., Brooks, W., Bultmann, S., Burkert, V., Butuceanu, C., Calarco, J., Careccia, S., Carman, D., Cazes, A., Chen, S., Cole, P., Cords, D., Corvisiero, P., Crabb, D., Cummings, J., De Sanctis, E., DeVita, R., Degtyarenko, P., Denizli, H., Dennis, L., Deur, A., Dharmawardane, K., Dhuga, K., Djalali, C., Dodge, G., Donnelly, J., Doughty, D., Dugger, M., Dytman, S., Dzyubak, O., Egiyan, H., Egiyan, K., Elouadrhiri, L., Eugenio, P., Fatemi, R., Feldman, G., Fersch, R., Feuerbach, R., Funsten, H., Gavalian, G., Gilfoyle, G., Giovanetti, K., Girod, F., Goetz, J., Gordon, C., Gothe, R., Griffioen, K., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hakobyan, R., Hardie, J., Heddle, D., Hersman, F., Hicks, K., Hleiqawi, I., Holtrop, M., Hyde-Wright, C., Ilieva, Y., Ireland, D., Ito, M., Jenkins, D., Jo, H., Joo, K., Juengst, H., Kellie, J., Khandaker, M., Kim, W., Klein, A., Klein, F., Klimenko, A., Kossov, M., Kubarovski, V., Kramer, L., Kuhn, S., Kuhn, J., Lachniet, J., Langhenirich, J., Lawrence, D., Lee, T., Li, J., Livingston, K., Marchand, C., Maximon, L., McAleer, S., McKinnon, B., McNabb, J., Mecking, B., Mehrabyan, S., Melone, J., Mestayer, M., Meyer, C., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mokeev, V., Mueller, J., Mutchler, G., Napolitano, J., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B., Niyazov, R., Nozar, M., ORielly, G., Osipenko, M., Ostrovidov, A., Park, K., Pasyuk, E., Philips, S., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Popa, I., Pozdniakov, S., Preedom, B., Price, J., Prok, Y., Protopopescu, D., Raue, B., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B., Ronchetti, F., Rosner, G., Rossi, P., Rubin, P., Salgado, C., Santoro, J., Sapunenko, V., Schumacher, R., Serov, V., Sharabian, Y., Shaw, J., Skabelin, A., Smith, L., Sober, D., Stavinsky, A., Stepanyan, S., Stepanyan, S., Stokes, B., Stoler, P., Strakovsky, I., Strauch, S., Taiuti, M., Tedeschi, D., Thoma, U., Tkabladze, A., Todor, L., Tur, C., Ungaro, M., Vineyard, M., Vlassov, A., Weinstein, L., Weygand, D., Williams, M., Wolin, E., Wood, M., Yegneswaran, A., Zana, L., and CLAS Collaboration,
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal A
ISSN (Online):1434-601X
Published Online:08 June 2005

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