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. 2006 Sep 8;97(10):102001.
doi: 10.1103/PhysRevLett.97.102001. Epub 2006 Sep 7.

Search for Theta++ pentaquarks in the exclusive reaction gammap-->K+K-p

V Kubarovsky  1 , M Battaglieri, R De Vita, J Goett, 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 Collins, P Coltharp, D Crabb, H Crannell, V Crede, J P Cummings, R De Masi, 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 T Goetz, E Golovach, A Gonenc, C I O Gordon, R W Gothe, K A Griffioen, M Guidal, N Guler, V Gyurjyan, C Hadjidakis, K Hafidi, 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, 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, J Kuhn, S E Kuhn, S V Kuleshov, J Lachniet, J M Laget, J Langheinrich, D Lawrence, T Lee, Ji Li, K Livingston, H Lu, M MacCormick, N Markov, 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, M Moteabbed, P Nadel-Turonski, I Nakagawa, R Nasseripour, S Niccolai, 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, 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, N V Shvedunov, 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++ pentaquarks in the exclusive reaction gammap-->K+K-p

V Kubarovsky et al. Phys Rev Lett. .

Abstract

The reaction gammap --> pK+K- was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a Theta++ pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK+ invariant mass spectrum. No statistically significant evidence of a Theta++ was found. Upper limits on the total and differential cross section for the reaction gammap --> K-Theta++ were obtained in the mass range from 1.5 to 2.0 GeV/c2, with an upper limit for a narrow resonance with a mass M(Theta++) = 1.54 GeV/c2 of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the Theta++ width Gamma(Theta++) <0.1 MeV/c2.

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