Photoproduction of π+π- meson pairs on the proton

M. Battaglieri, R. De Vita, A. P. Szczepaniak, K. P. Adhikari, M. J. Amaryan, M. Anghinolfi, H. Baghdasaryan, I. Bedlinskiy, M. Bellis, L. Bibrzycki, A. S. Biselli, C. Bookwalter, D. Branford, W. J. Briscoe, V. D. Burkert, S. L. Careccia, D. S. Carman, E. Clinton, P. L. Cole, P. CollinsV. Crede, D. Dale, A. D'Angelo, A. Daniel, N. Dashyan, E. De Sanctis, A. Deur, S. Dhamija, C. Djalali, G. E. Dodge, D. Doughty, V. Drozdov, H. Egiyan, P. Eugenio, G. Fedotov, S. Fegan, A. Fradi, M. Y. Gabrielyan, L. Gan, M. Garçon, A. Gasparian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, O. Glamazdin, J. Goett, J. T. Goetz, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, L. Guo, K. Hafidi, H. Hakobyan, C. Hanretty, N. Hassall, K. Hicks, M. Holtrop, C. E. Hyde, Y. Ilieva, D. G. Ireland, E. L. Isupov, J. R. Johnstone, K. Joo, D. Keller, M. Khandaker, P. Khetarpal, W. Kim, A. Klein, F. J. Klein, M. Kossov, A. Kubarovsky, V. Kubarovsky, S. V. Kuleshov, V. Kuznetsov, J. M. Laget, L. Lesniak, K. Livingston, H. Y. Lu, M. Mayer, M. E. McCracken, B. McKinnon, C. A. Meyer, K. Mikhailov, T. T. Mineeva, M. Mirazita, V. Mochalov, V. Mokeev, K. Moriya, E. Munevar, P. Nadel-Turonski, I. Nakagawa, C. S. Nepali, S. Niccolai, I. Niculescu, M. R. Niroula, M. Osipenko, A. I. Ostrovidov, K. Park, S. Park, M. Paris, E. Pasyuk, S. Anefalos Pereira, S. Pisano, N. Pivnyuk, O. Pogorelko, S. Pozdniakov, J. W. Price, Y. Prok, D. Protopopescu, B. A. Raue, G. Ricco, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, R. A. Schumacher, H. Seraydaryan, Y. G. Sharabian, D. I. Sober, D. Sokhan, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, A. Teymurazyan, S. Tkachenko, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, L. Zana, J. Zhang, B. Zhao, Z. W. Zhao

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36 Scopus citations

Abstract

The exclusive reaction γp→pπ+π- was studied in the photon energy range 3.0-3.8 GeV and the momentum transfer range 0.4<-t<1.0GeV2. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range, the integrated luminosity was about 20pb-1. The reaction was isolated by detecting the π+ and proton in CLAS, and reconstructing the π- via the missing-mass technique. Moments of the di-pion decay angular distributions were derived from the experimental data. Differential cross sections for the S, P, and D-waves, in the Mπ+π- mass range 0.4-1.4 GeV, were derived performing a partial wave expansion of the extracted moments. Beside the dominant contribution of the ρ(770) meson in the P-wave, evidence for the f0(980) and the f2(1270) mesons was found in the S and D-waves, respectively. The differential production cross sections dσ/dt for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the f0(980) has been measured in a photoproduction experiment.

Original languageEnglish (US)
Article number072005
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume80
Issue number7
DOIs
StatePublished - Oct 22 2009

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