Exclusive electroproduction of two pions at HERA

Abramowicz, H. et al. (2012) Exclusive electroproduction of two pions at HERA. European Physical Journal C, 72(1), p. 1869. (doi: 10.1140/epjc/s10052-012-1869-5)

Abstract

The exclusive electroproduction of two pions in the mass range 0.4<M ππ<2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb^-1. The analysis was carried out in the kinematic range of 2<Q ²<80 GeV², 32<W<180 GeV and |t|<0.6 GeV², where Q² is the photon virtuality, W is the photon-proton centre-of-mass energy and <i>t</i> is the squared four-momentum transfer at the proton vertex. The two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic form factor, |F(M ππ )|, assuming that the studied mass range includes the contributions of the ρ, ρ′ and ρ′′ vector-meson states. The masses and widths of the resonances were obtained and the Q² dependence of the cross-section ratios δ(ρ′→ππ)/δ(ρ) and δ(ρ′′→)/δ(ρ) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e⁺ e⁻→π⁺ π⁻.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ferrando, Dr James and Doyle, Professor Anthony and Saxon, Professor David and Bussey, Dr Peter
• Authors: Abramowicz, H., Abt, I., Adamczyk, L., Adamus, M., Aggarwal, R., Antonelli, S., Antonioli, P., Antonov, A., Arneodo, M., Ashery, D., Aushev, V., Aushev, Y., Bachynska, O., Bamberger, A., Barakbaev, A.N., Barbagli, G., Bari, G., Barreiro, F., Bartosik, N., Bartsch, D., Basile, M., Behnke, O., Behr, J., Behrens, U., Bellagamba, L., Bertolin, A., Bhadra, S., Bindi, M., Blohm, C., Bokhonov, V., Bołd, T., Bondarenko, K., Boos, E.G., Borras, K., Boscherini, D., Bot, D., Brock, I., Brownson, E., Brugnera, R., Brümmer, N., Bruni, A., Bruni, G., Brzozowska, B., Bussey, P.J., Bylsma, B., Caldwell, A., Capua, M., Carlin, R., Catterall, C.D., Chekanov, S., Chwastowski, J., Ciborowski, J., Ciesielski, R., Cifarelli, L., Cindolo, F., Contin, A., Cooper-Sarkar, A.M., Coppola, N., Corradi, M., Corriveau, F., Costa, M., D’Agostini, G., Dal Corso, F., del Peso, J., Dementiev, R.K., Pasquale, S., Derrick, M., Devenish, R.C.E., Dobur, D., Dolgoshein, B.A., Dolinska, G., Doyle, A.T., Drugakov, V., Durkin, L.S., Dusini, S., Eisenberg, Y., Ermolov, P.F., Eskreys, S., Fang, S., Fazio, S., Ferrando, J., Ferrero, M.I., Figiel, J., Forrest, M., Foster, B., Gach, G., Galas, A., Gallo, E., Garfagnini, A., Geiser, A., Gialas, I., Gladilin, L.K., Gladkov, D., Glasman, C., Gogota, O., Golubkov, Y.A., Göttlicher, P., Grabowska-Bołd, I., Grebenyuk, J., Gregor, I., Grigorescu, G., Grzelak, G., Gueta, O., Gurvich, E., Guzik, M., Gwenlan, C., Haas, T., Hain, W., Hamatsu, R., Hart, J.C., Hartmann, H., Hartner, G., Hilger, E., Hochman, D., Hori, R., Horton, K., Hüttmann, A., Ibrahim, Z.A., Iga, Y., Ingbir, R., Ishitsuka, M., Jakob, H.-P., Januschek, F., Jones, T.W., Jüngst, M., Kadenko, I., Kahle, B., Kananov, S., Kanno, T., Karshon, U., Karstens, F., Katkov, I.I., Kaur, M., Kaur, P., Keramidas, A., Khein, L.A., Kim, J. Y., Kisielewska, D., Kitamura, S., Klanner, R., Klein, U., Koffeman, E., Kooijman, P., Korol, I., Korzhavina, I.A., Kotański, A., Kötz, U., Kowalski, H., Kuprash, O., Kuze, M., Lee, A., Levchenko, B.B., Levy, A., Libov, V., Limentani, S., Ling, T.Y., Lisovyi, M., Lobodzinska, E., Lohmann, W., Löhr, B., Lohrmann, E., Long, K.R., Longhin, A., Lontkovskyi, D., Lukina, O.Y., Maeda, J., Magill, S., Makarenko, I., Malka, J., Mankel, R., Margotti, A., Marini, G., Martin, J.F., Mastroberardino, A., Mattingly, M.C.K., Melzer-Pellmann, I.-A., Mergelmeyer, S., Miglioranzi, S., Mohamad Idris, F., Monaco, V., Montanari, A., Morris, J.D., Mujkic, K., Musgrave, B., Nagano, K., Namsoo, T., Nania, R., Nigro, A., Ning, Y., Nobe, T., Noor, U., Notz, D., Nowak, R.J., Nuncio-Quiroz, A.E., Oh, B.Y., Okazaki, N., Oliver, K., Olkiewicz, K., Onishchuk, Y., Papageorgiu, K., Parenti, A., Paul, E., Pawlak, J.M., Pawlik, B., Pelfer, P.G., Pellegrino, A., Perlański, W., Perrey, H., Piotrzkowski, K., Pluciński, P., Pokrovskiy, N.S., Polini, A., Proskuryakov, A.S., Przybycień, M., Raval, A., Reeder, D.D., Reisert, B., Ren, Z., Repond, J., Ri, Y.D., Robertson, A., Roloff, P., Rubinsky, I., Ruspa, M., Sacchi, R., Salii, A., Samson, U., Sartorelli, G., Savin, A.A., Saxon, D.H., Schioppa, M., Schlenstedt, S., Schleper, P., Schmidke, W.B., Schneekloth, U., Schönberg, V., Schörner-Sadenius, T., Schwartz, J., Sciulli, F., Shcheglova, L.M., Shehzadi, R., Shimizu, S., Singh, I., Skillicorn, I.O., Słomiński, W., Smith, W.H., Sola, V., Solano, A., Son, D., Sosnovtsev, V., Spiridonov, A., Stadie, H., Stanco, L., Stern, A., Stewart, T.P., Stifutkin, A., Stopa, P., Suchkov, S., Susinno, G., Suszycki, L., Sztuk-Dambietz, J., Szuba, D., Szuba, J., Tapper, A.D., Tassi, E., Terrón, J., Theedt, T., Tiecke, H., Tokushuku, K., Tomalak, O., Tomaszewska, J., Tsurugai, T., Turcato, M., Tymieniecka, T., Vázquez, M., Verbytskyi, A., Viazlo, O., Vlasov, N.N., Volynets, O., Walczak, R., Wan Abdullah, W.A.T., Whitmore, J.J., Wiggers, L., Wing, M., Wlasenko, M., Wolf, G., Wolfe, H., Wrona, K., Yagües-Molina, A.G., Yamada, S., Yamazaki, Y., Yoshida, R., Youngman, C., Żarnecki, A. F., Zawiejski, L., Zenaiev, O., Zeuner, W., Zhautykov, B. O., Zhmak, N., Zhou, C., Zichichi, A., Zolkapli, Z., Zolko, M., and Zotkin, D. S.
• College/School: UNSPECIFIED
• Journal Name: European Physical Journal C
• ISSN: 1434-6044
• ISSN (Online): 1434-6052