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. 2006 Jun 2;96(21):212001.
doi: 10.1103/PhysRevLett.96.212001. Epub 2006 Jun 1.

Search for the Theta+ pentaquark in the reaction gammad --> pK-K+n

B McKinnon  1 , K Hicks, N A Baltzell, D S Carman, M D Mestayer, T Mibe, M Mirazita, S Niccolai, P Rossi, S Stepanyan, D J Tedeschi, P Ambrozewicz, M Anghinolfi, G Asryan, H Avakian, H Bagdasaryan, N Baillie, J P Ball, V Batourine, M Battaglieri, 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, S Chen, P L Cole, P Collins, P Coltharp, D Crabb, V Crede, D Dale, R De Masi, R DeVita, E De Sanctis, P V Degtyarenko, A Deur, 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, G Feldman, H Funsten, M Gabrielyan, L Gan, M Garçon, A Gasparian, G Gavalian, G P Gilfoyle, K L Giovanetti, F X Girod, J T Goetz, A Gonenc, R W Gothe, K A Griffioen, M Guidal, N Guler, L Guo, V Gyurjyan, R S Hakobyan, F W Hersman, 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, M Kossov, L H Kramer, V Kubarovsky, J Kuhn, S E Kuhn, S V Kuleshov, J Lachniet, J Langheinrich, D Lawrence, K Livingston, H Lu, M MacCormick, B A Mecking, C A Meyer, K Mikhailov, R Miskimen, V Mokeev, S A Morrow, M Moteabbed, G S Mutchler, I Nakagawa, P Nadel-Turonski, R Nasseripour, G Niculescu, I Niculescu, B B Niczyporuk, M R Niroula, R A Niyazov, M Nozar, M Osipenko, A I Ostrovidov, K Park, E Pasyuk, C Paterson, J Pierce, N Pivnyuk, O Pogorelko, S Pozdniakov, J W Price, Y Prok, D Protopopescu, B A Raue, 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, 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, A Teymurazyan, U Thoma, A Tkabladze, S Tkachenko, C Tur, M Ungaro, M F Vineyard, A V Vlassov, 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 reaction gammad --> pK-K+n

B McKinnon et al. Phys Rev Lett. .

Abstract

A search for the Theta+ in the reaction gammad --> pK-K+n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Theta+ resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Theta+ production in the mass range of 1.52-1.56 GeV/c2 for the gammad --> pK-Theta+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Theta+ production. Using Lambda(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary gamman --> K-Theta+ reaction is estimated to be a factor of 10 higher, i.e., approximately 3 nb (95% C.L.).

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