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. 2006 Feb 3;96(4):042001.
doi: 10.1103/PhysRevLett.96.042001. Epub 2006 Jan 31.

Search for Theta+ (1540) Pentaquark in High-Statistics Measurement of gammap-->K0K+n at CLAS

M Battaglieri  1 , R De Vita, V Kubarovsky, L Guo, G S Mutchler, P Stoler, D P Weygand, P Ambrozewicz, M Anghinolfi, G Asryan, H Avakian, H Bagdasaryan, N Baillie, J P Ball, N A Baltzell, V Batourine, I Bedlinskiy, M Bellis, N Benmouna, B L Berman, A S Biselli, S Bouchigny, S Boiarinov, R Bradford, D Branford, W J Briscoe, W K Brooks, S Bültmann, V D Burkert, C Butuceanu, J R Calarco, S L Careccia, D S Carman, S Chen, E Clinton, P L Cole, P Coltharp, D Crabb, H Crannell, J P Cummings, D Dale, E De Sanctis, P V Degtyarenko, A Deur, K V Dharmawardane, C Djalali, G E Dodge, J Donnelly, D Doughty, M Dugger, O P Dzyubak, H Egiyan, K S Egiyan, L Elouadrhiri, P Eugenio, G Fedotov, H Funsten, M Y Gabrielyan, L Gan, M Garçon, A Gasparian, G Gavalian, G P Gilfoyle, K L Giovanetti, F X Girod, O Glamazdin, J Goett, J T Goetz, E Golovach, A Gonenc, C I O Gordon, R W Gothe, K A Griffioen, M Guidal, N Guler, V Gyurjyan, C Hadjidakis, R S Hakobyan, J Hardie, F W Hersman, K Hicks, I Hleiqawi, M Holtrop, C E Hyde-Wright, Y Ilieva, D G Ireland, B S Ishkhanov, M M Ito, D Jenkins, H S Jo, K Joo, H G Juengst, J D Kellie, M Khandaker, W Kim, A Klein, F J Klein, A V Klimenko, M Kossov, L H Kramer, J Kuhn, S E Kuhn, S V Kuleshov, J Lachniet, J M Laget, J Langheinrich, D Lawrence, T Lee, Ji Li, K Livingston, B McKinnon, B A Mecking, J J Melone, M D Mestayer, C A Meyer, T Mibe, K Mikhailov, R Minehart, M Mirazita, R Miskimen, V Mochalov, V Mokeev, L Morand, S A Morrow, P Nadel-Turonski, I Nakagawa, R Nasseripour, S Niccolai, G Niculescu, I Niculescu, B B Niczyporuk, R A Niyazov, M Nozar, M Osipenko, A I Ostrovidov, K Park, E Pasyuk, C Paterson, J Pierce, N Pivnyuk, D Pocanic, O Pogorelko, S Pozdniakov, J W Price, Y Prok, D Protopopescu, B A Raue, G Riccardi, G Ricco, M Ripani, B G Ritchie, F Ronchetti, G Rosner, P Rossi, F Sabatié, C Salgado, J P Santoro, V Sapunenko, R A Schumacher, V S Serov, Y G Sharabian, E S Smith, L C Smith, D I Sober, A Stavinsky, S S Stepanyan, S Stepanyan, B E Stokes, I I Strakovsky, S Strauch, M Taiuti, D J Tedeschi, A Teymurazyan, U Thoma, A Tkabladze, S Tkachenko, L Todor, C Tur, M Ungaro, M F Vineyard, A V Vlassov, L B Weinstein, M Williams, E Wolin, M H Wood, A Yegneswaran, L Zana, J Zhang, B Zhao; CLAS Collaboration
Affiliations

Search for Theta+ (1540) Pentaquark in High-Statistics Measurement of gammap-->K0K+n at CLAS

M Battaglieri et al. Phys Rev Lett. .

Abstract

The exclusive reaction gammap-->K0K+n was studied in the photon energy range between 1.6 and 3.8 GeV searching for evidence of the exotic baryon Theta+ (1540)-->nK+. The decay to nK+requires the assignment of strangeness S=+1 to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 pb-1. No evidence for the Theta+ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and nK+ mass. The 95% C.L. upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.

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