DOI
10.1103/PhysRevD.80.072005
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 < 1:0 GeV2. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range, the integrated luminosity was about 20 pb-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 ƒ0(980) and the ƒ2(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 ƒ0(980) has been measured in a photoproduction experiment.
Document Type
Article
Publication Date
10-22-2009
Publisher Statement
Copyright © 2009 American Physical Society. This article first appeared in Physical Review D 80, no. 7 (October 22, 2009): 072005:1-19. doi:10.1103/PhysRevD.80.072005.
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Recommended Citation
Battaglieri, M., 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. Collins, V. 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. 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, and Z. W. Zhao. "Photoproduction of π+π- Meson Pairs on the Proton." Physical Review D 80, no. 7 (October 22, 2009): 072005:1-19. doi:10.1103/PhysRevD.80.072005.