Search for Θ^{++} Pentaquarks in the Exclusive Reaction γp→ K^{+} K^{-} p.

/ Authors

V. Kubarovsky, M. Battaglieri, R. D. Vita, J. Goett, L. Guo, G. Mutchler, P. Stoler, D. Weygand, P. Ambrozewicz, M. Anghinolfi

and 190 more authors

G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. Ball, N. Baltzell, V. Batourine, I. Bedlinskiy, M. Bellis, N. Benmouna, B. Berman, A. Biselli, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. Briscoe, W. Brooks, S. Bültmann, V. Burkert, C. Butuceanu, J. Calarco, S. Careccia, D. Carman, S. Chen, E. Clinton, P. Cole, P. Collins, P. Coltharp, D. Crabb, H. Crannell, V. Crede, J. Cummings, R. D. Masi, D. Dale, E. Sanctis, P. Degtyarenko, A. Deur, K. V. Dharmawardane, C. Djalali, G. Dodge, J. Donnelly, D. Doughty, M. Dugger, O. Dzyubak, H. Egiyan, K. Egiyan, L. Elouadrhiri, P. Eugenio, G. Fedotov, H. Funsten, M. Gabrielyan, L. Gan, M. Garçon, A. Gasparian, G. Gavalian, G. Gilfoyle, K. Giovanetti, F. Girod, O. Glamazdin, J. Goetz, E. Golovach, A. Gonenç, C. Gordon, R. Gothe, K. Griffioen, M. Guidal, N. Guler, V. Gyurjyan, C. Hadjidakis, K. Hafidi, R. Hakobyan, J. Hardie, F. Hersman, K. Hicks, I. Hleiqawi, P. H. Hopchev, C. Hyde-Wright, Y. Ilieva, D. Ireland, B. Ishkhanov, E. Isupov, M. Ito, D. Jenkins, H. Jo, K. Joo, H. Juengst, J. Kellie, M. Khandaker, W. Kim, A. Klein, F. Klein, A. Klimenko, M. Kossov, L. Kramer, J. Kuhn, S. Kuhn, S. Kuleshov, J. Lachniet, J. Laget, J. Langheinrich, D. Lawrence, T. Lee, Ji Li, K. Livingston, H. Lu, M. Maccormick, N. Markov, B. McKinnon, B. Mecking, J. Melone, M. Mestayer, C. Meyer, T. Mibe, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mochalov, V. Mokeev, L. Morand, S. Morrow, M. Moteabbed, P. Nadel-Turonski, I. Nakagawa, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. Niczyporuk, M. Niroula, R. Niyazov, M. Nozar, M. Osipenko, A. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, J. Pierce, N. Pivnyuk, D. Počanić, O. Pogorelko, S. Pozdniakov, J. Price, Y. Prok, D. Protopopescu, B. Raue, G. Riccardi, G. Ricco, M. Ripani, B. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, F. Sabatié, C. Salgado, J. Santoro, V. Sapunenko, R. Schumacher, V. Serov, Y. Sharabian, N. Shvedunov, E. Smith, L. Smith, D. Sober, A. Stavinsky, S. Stepanyan, S. Stepanyan, B. Stokes, I. Strakovsky, S. Strauch, M. Taiuti, D. Tedeschi, A. Teymurazyan, U. Thoma, A. Tkabladze, S. Tkachenko, L. Todor, C. Tur, M. Ungaro, M. Vineyard, A. Vlassov, L. Weinstein, M. Williams, E. Wolin, M. Wood, A. Yegneswaran, L. Zana, J. Zhang, B. Zhao

/ Abstract

The reaction {gamma}p {yields} K{sup +}K{sup -}p was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a {Theta}{sup ++} pentaquark, a narrow doubly charged baryon state having strangeness S = +1 and isospin I = 1, in the pK{sup +} invariant mass spectrum. No statistically significant evidence of a {Theta}{sup ++} was found. Upper limits on the total and differential production cross section for the reaction {gamma}p {yields} K{sup -}{Theta}{sup ++} were obtained in the mass range from 1.5 to 2.0 GeV/c{sup 2}, with an upper limit of about 0.15 nb, 95% C.L. for a narrow resonance with a mass M{sub {Theta}{sup ++}} = 1.54 GeV/c{sup 2}. This result places a very stringent upper limit on the {Theta}{sup ++} width.

Journal: Physical Review Letters

DOI: 10.1103/PhysRevLett.97.102001