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. 2006 Jul 21;97(3):032001.
doi: 10.1103/PhysRevLett.97.032001. Epub 2006 Jul 17.

Search for the Theta+ Pentaquark in the gammad--> DeltanK+ reaction measured with the CLAS spectrometer

S Niccolai  1 , M Mirazita, P Rossi, N A Baltzell, D S Carman, K Hicks, B McKinnon, T Mibe, S Stepanyan, D J Tedeschi, G Adams, P Ambrozewicz, S Anefalos Pereira, M Anghinolfi, G Asryan, H Avakian, H Bagdasaryan, N Baillie, J P Ball, V Batourine, M Battaglieri, I Bedlinskiy, M Bektasoglu, M Bellis, N Benmouna, B L Berman, A S Biselli, S Boiarinov, S Bouchigny, R Bradford, D Branford, W J Briscoe, W K Brooks, S Bültmann, V D Burkert, C Butuceanu, J R Calarco, S L Careccia, B Carnahan, S Chen, P L Cole, P Collins, P Coltharp, D Crabb, H Crannell, V Crede, J P Cummings, N Dashyan, P V Degtyarenko, R De Masi, A Deppman, E De Sanctis, A Deur, R Devita, K V Dharmawardane, C Djalali, G E Dodge, J Donnelly, D Doughty, M Dugger, O P Dzyubak, H Egiyan, K S Egiyan, L El Fassi, L Elouadrhiri, P Eugenio, G Fedotov, G Feldman, H Funsten, M Garçon, G Gavalian, G P Gilfoyle, K L Giovanetti, F X Girod, J T Goetz, A Gonenc, C I O Gordon, R W Gothe, K A Griffioen, M Guidal, N Guler, L Guo, V Gyurjyan, C Hadjidakis, K Hafidi, H Hakobyan, R S Hakobyan, J Hardie, F W Hersman, I Hleiqawi, M Holtrop, C E Hyde-Wright, Y Ilieva, D G Ireland, B S Ishkhanov, E L Isupov, 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, V Kubarovsky, J Kuhn, S E Kuhn, S V Kuleshov, J Lachniet, J Langheinrich, D Lawrence, T Lee, Ji Li, K Livingston, H Lu, M MacCormick, N Markov, B A Mecking, J Mellor, J J Melone, M D Mestayer, C A Meyer, K Mikhailov, R Minehart, R Miskimen, V Mokeev, L Morand, S A Morrow, M Moteabbed, G S Mutchler, P Nadel-Turonski, J Napolitano, R Nasseripour, G Niculescu, I Niculescu, B B Niczyporuk, M R Niroula, R A Niyazov, M Nozar, J de Oliveira Echeimberg, M Osipenko, A I Ostrovidov, K Park, E Pasyuk, C Paterson, J Pierce, N Pivnyuk, D Pocanic, O Pogorelko, S Pozdniakov, B M Preedom, J W Price, Y Prok, D Protopopescu, B A Raue, G Riccardi, G Ricco, M Ripani, B G Ritchie, F Ronchetti, G Rosner, F Sabatié, C Salgado, J P Santoro, V Sapunenko, R A Schumacher, V S Serov, Y G Sharabian, N V Shvedunov, E S Smith, L C Smith, D I Sober, A Stavinsky, S S Stepanyan, B E Stokes, P Stoler, I I Strakovsky, S Strauch, M Taiuti, U Thoma, A Tkabladze, S Tkachenko, L Todor, C Tur, M Ungaro, M F Vineyard, A V Vlassov, D P Watts, L B Weinstein, D P Weygand, M Williams, E Wolin, M H Wood, A Yegneswaran, L Zana, J Zhang, B Zhao, Z Zhao; CLAS Collaboration
Affiliations

Search for the Theta+ Pentaquark in the gammad--> DeltanK+ reaction measured with the CLAS spectrometer

S Niccolai et al. Phys Rev Lett. .

Abstract

For the first time, the reaction gammad-->DeltanK+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant-mass distribution. The upper limit on the gammad-->DeltaTheta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.

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