Cross sections for hard exclusive electroproduction of π+ mesons on a hydrogen target

• Published in: Physics letters. B Vol. 659; no. 3; pp. 486 - 492
• Main Authors: Akopov, N., Akopov, Z., Aschenauer, E.C., Barion, L., Belostotski, S., Blok, H.P., Bonomo, C., Borissov, A., Burns, J., Capiluppi, M., Capitani, G.P., Ciullo, G., Contalbrigo, M., Dalpiaz, P.F., Deconinck, W., Demey, M., De Sanctis, E., Diefenthaler, M., Düren, M., Ehrenfried, M., Ellinghaus, F., Fabbri, R., Fantoni, A., Frullani, S., Gapienko, V., Garibaldi, F., Gavrilov, G., Gliske, S., Guler, H., Hillenbrand, A., Hoek, M., Hristova, I., Ilyichev, A., Imazu, Y., Kaiser, R., Keri, T., Kopytin, M., Korotkov, V., Krivokhijine, V.G., Lamb, R., Lehmann, I., Lenisa, P., Linden-Levy, L.A., Lopez Ruiz, A., Lorenzon, W., Lu, X., Makins, N.C.R., Marianski, B., Marukyan, H., Miller, C.A., Miyachi, Y., Muccifora, V., Mussgiller, A., Naryshkin, Y., Nass, A., Nowak, W.-D., Pappalardo, L.L., Perez-Benito, R., Raithel, M., Reolon, A.R., Riedl, C., Rock, S.E., Rosner, G., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Schäfer, A., Schnell, G., Schüler, K.P., Seitz, B., Shibata, T.-A., Shutov, V., Stancari, M., Statera, M., Steijger, J.J.M., Stewart, J., Streit, J., Taroian, S., Thomas, E., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P.B., van der Steenhoven, G., van Haarlem, Y., van Hulse, C., Varanda, M., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, H., Ye, Z., Yen, S., Zeiler, D., Zihlmann, B.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 24-01-2008; Elsevier Science
• Subjects: Exact sciences and technology; Nuclear physics; Physics; The physics of elementary particles and fields; 13.60.-r; 14.40.Aq; 14.20.Dh; 13.60.Le; 13.85.Lg; Electron beams; Mesons; Partons; Models; Electroproduction; GeV range; Virtual particles; Cross sections; Corrections; Positron beams
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2007.11.079

The exclusive electroproduction of π+ mesons was studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off an internal hydrogen gas target. The virtual-photon cross sections were measured as a function of the Mandelstam variable t and the squared four momentum −Q2 of the exchanged virtual photon. A model calculation based on Generalized Parton Distributions is in fair agreement with the data at low values of |t| if power corrections are included. A model calculation based on the Regge formalism gives a good description of the magnitude and the t and Q2 dependences of the cross section.