Search for the Θ+ pentaquark in the reactions γp→K¯¯¯0K+n and γp→K¯¯¯0K0p

De Vita, R. et al. (2006) Search for the Θ+ pentaquark in the reactions γp→K¯¯¯0K+n and γp→K¯¯¯0K0p. Physical Review D, 74(3), 032001. (doi:10.1103/PhysRevD.74.032001)

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Abstract

Search for the Θ<sup>+</sup> pentaquark in the reactions γp→K<sup>¯¯¯0</sup>K<sup>+</sup>n and γp→K<sup>¯¯¯0</sup>K<sup>0</sup>p The exclusive reactions γp→K<sup>¯¯¯0</sup>K<sup>+</sup>n and γp→K<sup>¯¯¯0</sup>K<sup>0</sup>p have been studied in the photon energy range 1.6–3.8 GeV, searching for evidence of the exotic baryon Θ+(1540) in the decays Θ<sup>+</sup> →nK<sup>+</sup> and Θ<sup>+</sup> →pK<sup>0</sup>. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The integrated luminosity was about 70  pb<sup>−1</sup>. The reactions have been isolated by detecting the K<sup>+</sup> and proton directly, the neutral kaon via its decay to KS→π<sup>+</sup>π<sup>−</sup> and the neutron or neutral kaon via the missing mass technique. The mass and width of known hyperons such as Σ<sup>+</sup>, Σ<sup>−</sup> and Λ(1116) were used as a check of the mass determination accuracy and experimental resolution. Approximately 100 000 Λ∗(1520)’s and 150 000 ϕ’s were observed in the K<sup>¯¯¯0</sup>K<sup>+</sup>n and K<sup>¯¯¯0</sup>K<sup>0</sup>p final state, respectively. No evidence for the Θ<sup>+</sup> pentaquark was found in the nK<sup>+</sup> or pK<sub>S</sub> invariant mass spectra. Upper limits were set on the production cross section of the reaction γp→K<sup>¯¯¯0</sup>Θ<sup>+</sup> as functions of center-of-mass angle, nK<sup>+</sup> and pK<sub>S</sub> 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 Θ<sup>+</sup> width, Γ<sub>Θ+</sub>, ranging between 0.01 and 7 MeV.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McKinnon, Dr Bryan and Livingston, Dr Kenneth and Watts, Dr Daniel and Protopopescu, Dr Dan and Ireland, Professor David and Kellie, Dr James and Rosner, Professor Guenther
Authors: De Vita, R., Battaglieri, M., Kubarovsky, V., Baltzell, N., Bellis, M., Goett, J., Guo, L., Mutchler, G., Stoler, P., Ungaro, M., Weygand, D., Amaryan, M., Ambrozewicz, P., Anghinolfi, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J., Batourine, V., Bedlinskiy, I., Benmouna, N., Berman, B., Biselli, A., Boiarinov, S., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W., Brooks, W., Bultmann, S., Burkert, V., Butuceanu, C., Calarco, J., Careccia, S., Carman, D., Chen, S., Clinton, E., Cole, P., Collins, P., Coltharp, P., Crabb, D., Crannell, H., Crede, V., Cummings, J., Dale, D., De Masi, R., De Sanctis, E., Degtyarenko, P., Deur, A., Dharmawardane, K., Djalali, C., Dodge, G., Donnelly, J., Doughty, D., Dugger, M., Dzyubak, O., Egiyan, H., Egiyan, K., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Funsten, H., Gabrielyan, M., Gan, L., Garcon, M., Gasparian, A., Gavalian, G., Gilfoyle, G., Giovanetti, K., Girod, F., Glamazdin, O., Goetz, J., Golovach, E., Gonenc, A., Gordon, C., Gothe, R., Griffioen, K., Guidal, M., Guler, N., Gyurjyan, V., Hadjidakis, C., Hafidi, K., Hakobyan, H., Hakobyan, R., Hardie, J., Hersman, F., Hicks, K., Hleiqawi, I., Holtrop, M., Hyde-Wright, C., Ilieva, Y., Ireland, D., Ishkhanov, B., Isupov, E., Ito, M., Jenkins, D., Jo, H., Joo, K., Juengst, H., Kellie, J., Khandaker, M., Kim, W., Klein, A., Klein, F., Klimenko, A., Kossov, M., Kramer, L., Kuhn, J., Kuhn, S., Kuleshov, S., Lachniet, J., Laget, J., Langheinrich, J., Lawrence, D., Lee, T., Li, J., Livingston, K., Lu, H., MacCormick, M., Markov, N., McKinnon, B., Mecking, B., Melone, J., Mestayer, M., Meyer, C., Mibe, T., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mochalov, V., Mokeev, V., Morand, L., Morrow, S., Moteabbed, M., Nadel-Turonski, P., Nakagawa, I., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B., Niroula, M., Niyazov, R., Nozar, M., Osipenko, M., Ostrovidov, A., Park, K., Pasyuk, E., Paterson, C., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Pozdniakov, S., Price, J., Prok, Y., Protopopescu, D., Raue, B., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B., Ronchetti, F., Rosner, G., Rossi, P., Sabatie, F., Salgado, C., Santoro, J., Sapunenko, V., Schumacher, R., Serov, V., Sharabian, Y., Shvedunov, N., Smith, E., Smith, L., Sober, D., Stavinsky, A., Stepanyan, S., Stepanyan, S., Stokes, B., Strakovsky, I., Strauch, S., Taiuti, M., Tedeschi, D., Teymurazyan, A., Thoma, U., Tkabladze, A., Tkachenko, S., Todor, L., Tur, C., Vineyard, M., Vlassov, A., Watts, D., Weinstein, L., Williams, M., Wolin, E., Wood, M., Yegneswaran, A., Zana, L., and CLAS Collaboration,
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
Published Online:01 August 2006

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