Exclusive electroproduction of two pions at HERA
Creators: name: ZEUS Collaboration
name: Abramowicz, H.
name: Abt, I.
name: Adamczyk, L.
name: Adamus, M.
name: Aggarwal, R.
name: Antonelli, S.
name: Antonioli, P.
name: Antonov, A.
name: Arneodo, M.
name: Ashery, D.
name: Aushev, V.
name: Aushev, Y.
name: Bachynska, O.
name: Bamberger, A.
name: Barakbaev, A. N.
name: Barbagli, G.
name: Bari, G.
name: Barreiro, F.
name: Bartosik, N.
name: Bartsch, D.
name: Basile, M.
name: Behnke, O.
name: Behr, J.
name: Behrens, U.
name: Bellagamba, L.
name: Bertolin, A.
name: Bhadra, S.
name: Bindi, M.
name: Blohm, C.
name: Bokhonov, V.
name: Bołd, T.
name: Bondarenko, K.
name: Boos, E. G.
name: Borras, K.
name: Boscherini, D.
name: Bot, D.
name: Brock, I.
name: Brownson, E.
name: Brugnera, R.
name: Brümmer, N.
name: Bruni, A.
name: Bruni, G.
name: Brzozowska, B.
name: Bussey, P. J.
name: Bylsma, B.
name: Caldwell, A.
name: Capua, M.
name: Carlin, R.
name: Catterall, C. D.
name: Chekanov, S.
name: Chwastowski, J.
name: Ciborowski, J.
name: Ciesielski, R.
name: Cifarelli, L.
name: Cindolo, F.
name: Contin, A.
name: Cooper-Sarkar, A. M.
name: Coppola, N.
name: Corradi, M.
name: Corriveau, F.
name: Costa, M.
name: D'Agostini, G.
name: Corso, F. Dal
name: del Peso, J.
name: Dementiev, R. K.
name: De Pasquale, S.
name: Derrick, M.
name: Devenish, R. C. E.
name: Dobur, D.
name: Dolgoshein, B. A.
name: Dolinska, G.
name: Doyle, A. T.
name: Drugakov, V.
name: Durkin, L. S.
name: Dusini, S.
name: Eisenberg, Y.
name: Ermolov, P. F.
name: Eskreys, A.
name: Fang, S.
name: Fazio, S.
name: Ferrando, J.
name: Ferrero, M. I.
name: Figiel, J.
name: Forrest, M.
name: Foster, B.
name: Gach, G.
name: Galas, A.
name: Gallo, E.
name: Garfagnini, A.
name: Geiser, A.
name: Gialas, I.
name: Gladilin, L. K.
name: Gladkov, D.
name: Glasman, C.
name: Gogota, O.
name: Golubkov, Yu. A.
name: Göttlicher, P.
name: Grabowska-Bołd, I.
name: Grebenyuk, J.
name: Gregor, I.
name: Grigorescu, G.
name: Grzelak, G.
name: Gueta, O.
name: Gurvich, E.
name: Guzik, M.
name: Gwenlan, C.
name: Haas, T.
name: Hain, W.
name: Hamatsu, R.
name: Hart, J. C.
name: Hartmann, H.
name: Hartner, G.
name: Hilger, E.
name: Hochman, D.
name: Hori, R.
name: Horton, K.
name: Hüttmann, A.
name: Ibrahim, Z. A.
name: Iga, Y.
name: Ingbir, R.
name: Ishitsuka, M.
name: Jakob, H. -P.
name: Januschek, F.
name: Jones, T. W.
name: Jüngst, M.
name: Kadenko, I.
name: Kahle, B.
name: Kananov, S.
name: Kanno, T.
name: Karshon, U.
name: Karstens, F.
name: Katkov, I. I.
name: Kaur, M.
name: Kaur, P.
name: Keramidas, A.
name: Khein, L. A.
name: Kim, J. Y.
name: Kisielewska, D.
name: Kitamura, S.
name: Klanner, R.
name: Klein, U.
name: Koffeman, E.
name: Kooijman, P.
name: Korol, Ie.
name: Korzhavina, I. A.
name: Kotański, A.
name: Kötz, U.
name: Kowalski, H.
name: Kuprash, O.
name: Kuze, M.
name: Lee, A.
name: Levchenko, B. B.
name: Levy, A.
name: Libov, V.
name: Limentani, S.
name: Ling, T. Y.
name: Lisovyi, M.
name: Lobodzinska, E.
name: Lohmann, W.
name: Löhr, B.
name: Lohrmann, E.
name: Long, K. R.
name: Longhin, A.
name: Lontkovskyi, D.
name: Lukina, O. Yu.
name: Maeda, J.
name: Magill, S.
name: Makarenko, I.
name: Malka, J.
name: Mankel, R.
name: Margotti, A.
name: Marini, G.
name: Martin, J. F.
name: Mastroberardino, A.
name: Mattingly, M. C. K.
name: Melzer-Pellmann, I. -A.
name: Mergelmeyer, S.
name: Miglioranzi, S.
name: Idris, F. Mohamad
name: Monaco, V.
name: Montanari, A.
name: Morris, J. D.
name: Mujkic, K.
name: Musgrave, B.
name: Nagano, K.
name: Namsoo, T.
name: Nania, R.
name: Nigro, A.
name: Ning, Y.
name: Nobe, T.
name: Noor, U.
name: Notz, D.
name: Nowak, R. J.
name: Nuncio-Quiroz, A. E.
name: Oh, B. Y.
name: Okazaki, N.
name: Oliver, K.
name: Olkiewicz, K.
name: Onishchuk, Yu.
name: Papageorgiu, K.
name: Parenti, A.
name: Paul, E.
name: Pawlak, J. M.
name: Pawlik, B.
name: Pelfer, P. G.
name: Pellegrino, A.
name: Perlański, W.
name: Perrey, H.
name: Piotrzkowski, K.
name: Pluciński, P.
name: Pokrovskiy, N. S.
name: Polini, A.
name: Proskuryakov, A. S.
name: Przybycień, M.
name: Raval, A.
name: Reeder, D. D.
name: Reisert, B.
name: Ren, Z.
name: Repond, J.
name: Ri, Y. D.
name: Robertson, A.
name: Roloff, P.
name: Rubinsky, I.
name: Ruspa, M.
name: Sacchi, R.
name: Salii, A.
name: Samson, U.
name: Sartorelli, G.
name: Savin, A. A.
name: Saxon, D. H.
name: Schioppa, M.
name: Schlenstedt, S.
name: Schleper, P.
name: Schmidke, W. B.
name: Schneekloth, U.
name: Schönberg, V.
name: Schörner-Sadenius, T.
name: Schwartz, J.
name: Sciulli, F.
name: Shcheglova, L. M.
name: Shehzadi, R.
name: Shimizu, S.
name: Singh, I.
name: Skillicorn, I. O.
name: Słomiński, W.
name: Smith, W. H.
name: Sola, V.
name: Solano, A.
name: Son, D.
name: Sosnovtsev, V.
name: Spiridonov, A.
name: Stadie, H.
name: Stanco, L.
name: Stern, A.
name: Stewart, T. P.
name: Stifutkin, A.
name: Stopa, P.
name: Suchkov, S.
name: Susinno, G.
name: Suszycki, L.
name: Sztuk-Dambietz, J.
name: Szuba, D.
name: Szuba, J.
name: Tapper, A. D.
name: Tassi, E.
name: Terrón, J.
name: Theedt, T.
name: Tiecke, H.
name: Tokushuku, K.
name: Tomalak, O.
name: Tomaszewska, J.
name: Tsurugai, T.
name: Turcato, M.
name: Tymieniecka, T.
name: Vázquez, M.
name: Verbytskyi, A.
name: Viazlo, O.
name: Vlasov, N. N.
name: Volynets, O.
name: Walczak, R.
name: Abdullah, W. A. T. Wan
name: Whitmore, J. J.
name: Wiggers, L.
name: Wing, M.
name: Wlasenko, M.
name: Wolf, G.
name: Wolfe, H.
name: Wrona, K.
name: Yagües-Molina, A. G.
name: Yamada, S.
name: Yamazaki, Y.
name: Yoshida, R.
name: Youngman, C.
name: Żarnecki, A. F.
name: Zawiejski, L.
name: Zenaiev, O.
name: Zeuner, W.
name: Zhautykov, B. O.
name: Zhmak, N.
name: Zhou, C.
name: Zichichi, A.
name: Zolkapli, Z.
name: Zolko, M.
name: Zotkin, D. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The exclusive electroproduction of two pions in the mass range 0.4 &lt; Mππ &lt; 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 &lt; Q2 &lt; 80 GeV2, 32 &lt; W &lt; 180 GeV and |t| &lt; 0.6 GeV2, where Q2 is the photon virtuality, W is the photon-proton centre-of-mass energy and t 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(Mππ)|, 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 σ(ρ' \rightarrow ππ)/σ(ρ) and σ(ρ" \rightarrow ππ)/σ(ρ) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e+e- \rightarrow π+π-.
description: 24 pages, including 11 figures