Search for the Theta(+) pentaquark in the gamma d ->Lambda nK(+) reaction measured with the CLAS spectrometer
Doi:10.1103/PhysRevLett.9 Copyright 2006 by The American Physical Society.
For the first time, the reaction gamma d ->Lambda nK(+) 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 gamma d ->Lambda Theta(+) 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.
S Niccolai, M Mirazita, P Rossi, NA Baltzell, DS Carman, K Hicks, B McKinnon, T Mibe, S Stepanyan, DJ Tedeschi, G Adams, P Ambrozewicz, SA Pereira, M Anghinolfi, G Asryan, H Avakian, H Bagdasaryan, N Baillie, JP Ball, V Batourine, M Battaglieri, I Bedlinskiy, M Bektasoglu, M Bellis, N Benmouna, BL Berman, AS Biselli, S Boiarinov, S Bouchigny, R Bradford, D Branford, WJ Briscoe, WK Brooks, S Bultmann, VD Burkert, C Butuceanu, JR Calarco, SL Careccia, B Carnahan, S Chen, PL Cole, P Collins, P Coltharp, D Crabb, H Crannell, V Crede, JP Cummings, N Dashyan, PV Degtyarenko, R De Masi, A Deppman, E De Sanctis, A Deur, R DeVita, KV Dharmawardane, C Djalali, GE Dodge, J Donnelly, D Doughty, M Dugger, OP Dzyubak, H Egiyan, KS Egiyan, L El Fassi, L Elouadrhiri, P Eugenio, G Fedotov, G Feldman, H Funsten, M Garcon, G Gavalian, GP Gilfoyle, KL Giovanetti, FX Girod, JT Goetz, A Gonenc, CIO Gordon, RW Gothe, KA Griffioen, M Guidal, N Guler, L Guo, V Gyurjyan, C Hadjidakis, K Hafidi, H Hakobyan, RS Hakobyan, J Hardie, FW Hersman, I Hleiqawi, M Holtrop, CE Hyde-Wright, Y Ilieva, DG Ireland, BS Ishkhanov, EL Isupov, MM Ito, D Jenkins, HS Jo, K Joo, HG Juengst, JD Kellie, M Khandaker, W Kim, A Klein, FJ Klein, AV Klimenko, M Kossov, LH Kramer, V Kubarovsky, J Kuhn, SE Kuhn, SV Kuleshov, J Lachniet, J Langheinrich, D Lawrence, T Lee, J Li, K Livingston, H Lu, M MacCormick, N Markov, BA Mecking, J Mellor, JJ Melone, MD Mestayer, CA Meyer, K Mikhailov, R Minehart, R Miskimen, V Mokeev, L Morand, SA Morrow, M Moteabbed, GS Mutchler, P Nadel-Turonski, J Napolitano, R Nasseripour, G Niculescu, I Niculescu, BB Niczyporuk, MR Niroula, RA Niyazov, M Nozar, JD Echeimberg, M Osipenko, AI Ostrovidov, K Park, E Pasyuk, C Paterson, J Pierce, N Pivnyuk, D Pocanic, O Pogorelko, S Pozdniakov, BM Preedom, JW Price, Y Prok, D Protopopescu, BA Raue, G Riccardi, G Ricco, M Ripani, BG Ritchie, F Ronchetti, G Rosner, F Sabatie, C Salgado, JP Santoro, V Sapunenko, RA Schumacher, VS Serov, YG Sharabian, NV Shvedunov, ES Smith, LC Smith, DI Sober, A Stavinsky, SS Stepanyan, BE Stokes, P Stoler, II Strakovsky, S Strauch, M Taiuti, U Thoma, A Tkabladze, S Tkachenko, L Todor, C Tur, M Ungaro, MF Vineyard, AV Vlassov, DP Watts, LB Weinstein, DP Weygand, M Williams, E Wolin, MH Wood, A Yegneswaran, L Zana, J Zhang, B Zhao, and Z Zhao. "Search for the Theta(+) pentaquark in the gamma d ->Lambda nK(+) reaction measured with the CLAS spectrometer" Physical Review Letters 97.3 (2006).
Available at: http://works.bepress.com/michael_williams/9