Upper limits for the photoproduction cross section for the Φ--(1860) pentaquark state off the deuteron

H. Egiyan, J. Langheinrich, R. W. Gothe, L. Graham, M. Holtrop, H. Lu, P. Mattione, G. Mutchler, K. Park, E. S. Smith, S. Stepanyan, Z. W. Zhao, K. P. Adhikari, M. Aghasyan, M. Anghinolfi, H. Baghdasaryan, J. Ball, N. A. Baltzell, M. Battaglieri, I. BedlinskiyR. P. Bennett, A. S. Biselli, C. Bookwalter, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, S. Chandavar, M. Contalbrigo, A. D'Angelo, A. Daniel, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, B. Dey, R. Dickson, C. Djalali, D. Doughty, R. Dupre, A. El Alaoui, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, A. Fradi, M. Y. Gabrielyan, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, E. Golovatch, K. A. Griffioen, M. Guidal, N. Guler, L. Guo, V. Gyurjyan, K. Hafidi, H. Hakobyan, C. Hanretty, D. Heddle, K. Hicks, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, H. S. Jo, K. Joo, P. Khetarpal, A. Kim, W. Kim, A. Klein, F. J. Klein, V. Kubarovsky, S. V. Kuleshov, K. Livingston, I. J D MacGregor, Y. Mao, M. Mayer, B. McKinnon, V. Mokeev, E. Munevar, P. Nadel-Turonski, A. Ni, G. Niculescu, A. I. Ostrovidov, M. Paolone, L. Pappalardo, R. Paremuzyan, S. Park, E. Pasyuk, S. Anefalos Pereira, E. Phelps, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, D. Protopopescu, B. A. Raue, G. Ricco, D. Rimal, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, R. A. Schumacher, E. Seder, H. Seraydaryan, Y. G. Sharabian, G. D. Smith, D. I. Sober, S. S. Stepanyan, S. Strauch, M. Taiuti, W. Tang, C. E. Taylor, D. J. Tedeschi, M. Ungaro, E. Voutier, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. H. Wood, N. Zachariou, L. Zana, B. Zhao

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Abstract

We searched for the Φ--(1860) pentaquark in the photoproduction process off the deuteron in the Ξ-π --decay channel using CLAS. The invariant-mass spectrum of the Ξ-π- system does not indicate any statistically significant enhancement near the reported mass M=1.860 GeV. The statistical analysis of the sideband-subtracted mass spectrum yields a 90%-confidence-level upper limit of 0.7 nb for the photoproduction cross section of Φ--(1860) with a consecutive decay into Ξ-π- in the photon-energy range 4.5GeV<E γ<5.5GeV.

Original languageEnglish (US)
Article number015205
JournalPhysical Review C - Nuclear Physics
Volume85
Issue number1
DOIs
StatePublished - Jan 30 2012

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