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2003•Physical Review LettersOpen access

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. S. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Audit, H. Avakian, H. Bagdasaryan, J. Ball, S. Barrow, M. Battaglieri, K. Beard, M. 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, Alan Coleman, D. Cords, P. Corvisiero, Donald G. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, R. De Vita, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. 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. O. Funsten, M. Garçon, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, C. I. O. Gordon, R. W. Gothe, K. A. 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. F. 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, Frank Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. Kramer, Y. Kuang, V. Kubarovsky, S. E. Kuhn, J. Kühn, J. Lachniet, David Lawrence, J. Li, A. C. S. 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. T. O’Brien, G. V. O’Rielly, A. K. Opper, M. Osipenko, K. Park, G. A. Peterson, S. A. Philips, N. Pivnyuk, D. Počanić, 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, B. G. 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.R. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun

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Abstract

In an exclusive measurement of the reaction $\ensuremath{\gamma}d\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}pn$, a narrow peak that can be attributed to an exotic baryon with strangeness $S=+1$ is seen in the ${K}^{+}n$ invariant mass spectrum. The peak is at $1.542\ifmmode\pm\else\textpm\fi{}0.005\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ with a measured width of $0.021\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is $(5.2\ifmmode\pm\else\textpm\fi{}0.6)\ensuremath{\sigma}$. The mass and width of the observed peak are consistent with recent reports of a narrow $S=+1$ baryon by other experimental groups.

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What this paper is about

In an exclusive measurement of the reaction $\ensuremath{\gamma}d\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}pn$, a narrow peak that can be attributed to an exotic baryon with strangeness $S=+1$ is seen in the ${K}^{+}n$ invariant mass spectrum. The peak is at $1.542\ifmmode\pm\else\textpm\fi{}0.005\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ with a measured width of $0.021\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is $(5.2\ifmmode\pm\else\textpm\fi{}0.6)\ensuremath{\sigma}$. The mass and width of the observed peak are consistent with recent reports of a narrow $S=+1$ baryon by other experimental groups.

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Available abstract

In an exclusive measurement of the reaction $\ensuremath{\gamma}d\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}pn$, a narrow peak that can be attributed to an exotic baryon with strangeness $S=+1$ is seen in the ${K}^{+}n$ invariant mass spectrum. The peak is at $1.542\ifmmode\pm\else\textpm\fi{}0.005\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ with a measured width of $0.021\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is $(5.2\ifmmode\pm\else\textpm\fi{}0.6)\ensuremath{\sigma}$. The mass and width of the observed peak are consistent with recent reports of a narrow $S=+1$ baryon by other experimental groups.

Key concepts: Baryon, Physics, Strangeness, Full width at half maximum, Particle physics, Nuclear physics, Analytical Chemistry (journal), Atomic physics

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Observation of an Exotic S=+1 Baryon in Exclusive Photoproduction from the Deuteron — Research Paper | ScholarLens