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. © 2012 American Physical Society.
Original languageEnglish
JournalPhysical Review C - Nuclear Physics
DOIs
Publication statusPublished - 30 Jan 2012
Externally publishedYes

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