Search for the Θ+ pentaquark in the reaction γd→pK-K+n

B. McKinnon, 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. BattaglieriI. 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. Bultmann, 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, Michael Dugger, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, P. Eugenio, G. Fedotov, G. Feldman, H. Funsten, M. Gabrielyan, L. Gan, M. Garcon, 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, Barry Ritchie, F. Ronchetti, G. Rosner, F. Sabatie, 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

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Abstract

A search for the Θ+ in the reaction γd→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 Θ+ 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 Θ+ production in the mass range of 1.52-1.56GeV/c2 for the γd→pK-Θ+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Θ+ production. Using Λ(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary γn→K-Θ+ reaction is estimated to be a factor of 10 higher, i.e., ∼3nb (95% C.L.).

Original languageEnglish (US)
Article number212001
JournalPhysical Review Letters
Volume96
Issue number21
DOIs
StatePublished - Jun 12 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    McKinnon, B., Hicks, K., Baltzell, N. A., Carman, D. S., Mestayer, M. D., Mibe, T., Mirazita, M., Niccolai, S., Rossi, P., Stepanyan, S., Tedeschi, D. J., Ambrozewicz, P., Anghinolfi, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J. P., Batourine, V., ... Zhao, Z. (2006). Search for the Θ+ pentaquark in the reaction γd→pK-K+n. Physical Review Letters, 96(21), [212001]. https://doi.org/10.1103/PhysRevLett.96.212001