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

S Niccolai; 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

doi:10.1103/PhysRevLett.97.032001

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

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

Authors

S Niccolai¹, 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

Affiliation

¹ Institut de Physique Nucléaire, Orsay, France.

PMID: 16907494
DOI: 10.1103/PhysRevLett.97.032001

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.