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Photoproduction of pi+pi- 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. 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 1 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 2 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 1 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 2 I. Niculescu M. R. Niroula M. Osipenko A. I. Ostrovidov K. Park S. Park M. Paris E. Pasyuk S. Anefalos Pereira S. Pisano 2 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 1 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
Abstract : The exclusive reaction gammap-->ppi+pi- 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 pi+ and proton in CLAS, and reconstructing the pi- 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 Mpi+pi- mass range 0.4–1.4 GeV, were derived performing a partial wave expansion of the extracted moments. Beside the dominant contribution of the rho(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 dsigma/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.
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M. Battaglieri, R. de Vita, A. P. Szczepaniak, K. P. Adhikari, M. J. Amaryan, et al.. Photoproduction of pi+pi- meson pairs on the proton. Physical Review D, American Physical Society, 2009, 80, pp.072005 [19]. ⟨10.1103/PhysRevD.80.072005⟩. ⟨in2p3-00431821⟩

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