Search for the Theta(+) pentaquark in the reactions gamma p ->(K)over-bar(0)K(+)n and gamma p ->(K)over-bar(0)K(0)p

De Vita, R. et al. (2006) Search for the Theta(+) pentaquark in the reactions gamma p ->(K)over-bar(0)K(+)n and gamma p ->(K)over-bar(0)K(0)p. Physical Review D, 74(3), (doi: 10.1103/PhysRevD.74.032001)

Abstract

The exclusive reactions gamma p ->(K) over bar (0)K(+)n and gamma p ->(K) over bar (0)K(0)p have been studied in the photon energy range 1.6-3.8 GeV, searching for evidence of the exotic baryon Theta(+)(1540) in the decays Theta(+)-> nK(+) and Theta(+)-> pK(0). Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The integrated luminosity was about 70 pb(-1). The reactions have been isolated by detecting the K+ and proton directly, the neutral kaon via its decay to K-S ->pi(+)pi(-) and the neutron or neutral kaon via the missing mass technique. The mass and width of known hyperons such as Sigma(+), Sigma(-) and Lambda(1116) were used as a check of the mass determination accuracy and experimental resolution. Approximately 100 000 Lambda(*)(1520)'s and 150 000 phi's were observed in the (K) over bar (0)K(+)n and (K) over bar (0)K(0)p final state, respectively. No evidence for the Theta(+) pentaquark was found in the nK(+) or pK(S) invariant mass spectra. Upper limits were set on the production cross section of the reaction gamma p ->(K) over bar (0)Theta(+) as functions of center-of-mass angle, nK(+) and pK(S) masses. Combining the results of the two reactions, the 95% C.L. upper limit on the total cross section for a resonance peaked at 1540 MeV was found to be 0.7 nb. Within most of the available theoretical models, this corresponds to an upper limit on the Theta(+) width, Gamma(+)(Theta), ranging between 0.01 and 7 MeV.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Protopopescu, Dr Dan
• Authors: De Vita, R., Battaglieri, M., Kubarovsky, V., Baltzell, N. A., Bellis, M., Goett, J., Guo, L., Mutchler, G. S., Stoler, P., Ungaro, M., Weygand, D. P., Amaryan, M. J., Ambrozewicz, P., Anghinolfi, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J. P., Batourine, V., Bedlinskiy, I., Benmouna, N., Berman, B. L., Biselli, A. S., Boiarinov, S., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W. J., Brooks, W. K., Bultmann, S., Burkert, V. D., Butuceanu, C., Calarco, J. R., Careccia, S. L., Carman, D. S., Chen, S., Clinton, E., Cole, P. L., Collins, P., Coltharp, P., Crabb, D., Crannell, H., Crede, V., Cummings, J. P., Dale, D., De Masi, R., De Sanctis, E., Degtyarenko, P. V., Deur, A., Dharmawardane, K. V., Djalali, C., Dodge, G. E., Donnelly, J., Doughty, D., Dugger, M., Dzyubak, O. P., Egiyan, H., Egiyan, K. S., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Funsten, H., Gabrielyan, M. Y., Gan, L., Garcon, M., Gasparian, A., Gavalian, G., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glamazdin, O., Goetz, J. T., Golovach, E., Gonenc, A., Gordon, C. I. O., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Gyurjyan, V., Hadjidakis, C., Hafidi, K., Hakobyan, H., Hakobyan, R. S., Hardie, J., Hersman, F. W., Hicks, K., Hleiqawi, I., Holtrop, M., Hyde-Wright, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Ito, M. M., Jenkins, D., Jo, H. S., Joo, K., Juengst, H. G., Kellie, J. D., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Klimenko, A. V., Kossov, M., Kramer, L. H., Kuhn, J., Kuhn, S. E., Kuleshov, S. V., Lachniet, J., Laget, J. M., Langheinrich, J., Lawrence, D., Lee, T., Li, J., Livingston, K., Lu, H. Y., MacCormick, M., Markov, N., McKinnon, B., Mecking, B. A., Melone, J. J., Mestayer, M. D., Meyer, C. A., Mibe, T., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mochalov, V., Mokeev, V., Morand, L., Morrow, S. A., Moteabbed, M., Nadel-Turonski, P., Nakagawa, I., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B. B., Niroula, M. R., Niyazov, R. A., Nozar, M., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Paterson, C., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Pozdniakov, S., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B. G., Ronchetti, F., Rosner, G., Rossi, P., Sabatie, F., Salgado, C., Santoro, J. P., Sapunenko, V., Schumacher, R. A., Serov, V. S., Sharabian, Y. G., Shvedunov, N. V., Smith, E. S., Smith, L. C., Sober, D. I., Stavinsky, A., Stepanyan, S. S., Stepanyan, S., Stokes, B. E., Strakovsky, I. I., Strauch, S., Taiuti, M., Tedeschi, D. J., Teymurazyan, A., Thoma, U., Tkabladze, A., Tkachenko, S., Todor, L., Tur, C., Vineyard, M. F., Vlassov, A. V., Watts, D. P., Weinstein, L. B., Williams, M., Wolin, E., Wood, M. H., Yegneswaran, A., and Zana, L.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 1550-7998
• ISSN (Online): 1089-4918