Search for the Θ+ pentaquark in the γd→ΛnK+ 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. BatourineM. 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, Michael 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, J. 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, Barry 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

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Abstract

For the first time, the reaction γd→ΛnK+ has been analyzed in order to search for the exotic pentaquark baryon Θ+(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 γd→ΛΘ+ 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.

Original languageEnglish (US)
Article number032001
JournalPhysical Review Letters
Volume97
Issue number3
DOIs
StatePublished - Jul 24 2006

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Niccolai, S., Mirazita, M., Rossi, P., Baltzell, N. A., Carman, D. S., Hicks, K., McKinnon, B., Mibe, T., Stepanyan, S., Tedeschi, D. J., Adams, G., Ambrozewicz, P., Anefalos Pereira, S., Anghinolfi, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J. P., ... Zhao, Z. (2006). Search for the Θ+ pentaquark in the γd→ΛnK+ reaction measured with the CLAS spectrometer. Physical Review Letters, 97(3), [032001]. https://doi.org/10.1103/PhysRevLett.97.032001