Observation of an Exotic S = +1 Baryon in Exclusive Photoproduction from the Deuteron

S. Stepanyan, K. Hicks, D. S. Carman, E. Pasyuk, R. A. Schumacher, E. S. Smith, D. J. Tedeschi, L. Todor, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Audit, H. Avakian, H. Bagdasaryan, J. P. Ball, S. P. Barrow, M. Battaglieri, K. BeardM. Bektasoglu, M. Bellis, B. L. Berman, N. Bianchi, A. S. Biselli, S. Boiarinov, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, C. Butuceanu, J. R. Calarco, B. Carnahan, S. Chen, L. Ciciani, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. de Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, R. DeVita, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, Michael Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, H. Funsten, M. Garçon, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, C. I O Gordon, R. Gothe, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, K. Joo, H. G. Juengst, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, V. Kubarovsky, S. E. Kuhn, J. Kuhn, J. Lachniet, D. Lawrence, J. Li, A. Lima, K. Livingston, K. Lukashin, J. J. Manak, S. McAleer, J. W C McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, S. Morrow, V. Muccifora, J. Mueller, L. Y. Murphy, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. O'Brien, G. V. O'Rielly, A. K. Opper, M. Osipenko, K. Park, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, P. Rossi, D. Rowntree, P. Rubin, F. Sabatié, C. Salgado, J. Santoro, V. Sapunenko, V. S. Serov, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, L. C. Smith, D. I. Sober, I. I. Strakovsky, A. Stavinsky, P. Stoler, R. Suleiman, M. Taiuti, S. Taylor, U. Thoma, R. Thompson, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun

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Abstract

An exotic S = +1 baryon was observed in exclusive photoproduction from the deuteron. The peak was at 1.542±0.005 GeV/c2 with a measured width of 0.021 GeV/c2 FWHM, which is largely determined by experimental mass resolution. Photon beams were produced by 2.474 and 3.115 GeV electrons incident on a bremsstrahlung radiator of thickness 10-4 radiation lengths. The mass and width of the observed peak were found to be consistent with a narrow S = +1 baryon by other experimental groups.

Original languageEnglish (US)
Article number252001
Pages (from-to)2520011-2520015
Number of pages5
JournalPhysical Review Letters
Volume91
Issue number25
StatePublished - Dec 19 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Stepanyan, S., Hicks, K., Carman, D. S., Pasyuk, E., Schumacher, R. A., Smith, E. S., Tedeschi, D. J., Todor, L., Adams, G., Ambrozewicz, P., Anciant, E., Anghinolfi, M., Asavapibhop, B., Audit, G., Avakian, H., Bagdasaryan, H., Ball, J. P., Barrow, S. P., Battaglieri, M., ... Yun, J. (2003). Observation of an Exotic S = +1 Baryon in Exclusive Photoproduction from the Deuteron. Physical Review Letters, 91(25), 2520011-2520015. [252001].