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arXiv · 1308.5659

$K^+Λ$ and $K^+Σ^0$ photoproduction with fine center-of-mass energy resolution

T. C. Jude·D. I. Glazier·D. P. Watts·P. Aguar-Bartolome·L. K. Akasoy·J. R. M. Annand·H. J. Arends·K. Bantawa·R. Beck·V. S. Bekrenev·H. Berghauser·A. Braghieri·D. Branford·W. J. Briscoe·J. Brudvik·S. Cherepnya·B. T. Demissie·M. Dieterle·E. J. Downie·L. V. Fil'kov·R. Gregor·E. Heid·D. Hornidge·I. Jaegle·O. Jahn·V. L. Kashevarov·I. Keshelashvili·R. Kondratiev·M. Korolija·A. A. Koulbardis·S. P. Kruglov·B. Krusche·V. Lisin·K. Livingston·I. J. D. MacGregor·Y. Maghrbi·D. M. Manley·Z. Marinides·T. Mart·M. Martinez·J. C. McGeorge·E. F. McNicoll·D. G. Middleton·A. Mushkarenkov·B. M. K. Nefkens·A. Nikolaev·V. A. Nikonov·M. Oberle·M. Ostrick·P. B. Otte·B. Oussena·P. Pedroni·F. Pheron·A. Polonski·S. Prakhov·J. Robinson·G. Rosner·T. Rostomyan·A. V. Sarantsev·S. Schumann·M. H. Sikora·D. I. Sober·A. Starostin·I. Strakovsky·I. M. Suarez·I. Supek·M. Thiel·A. Thomas·M. Unverzagt·D. Werthmueller·L. Witthauer·F. Zehr
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Abstract

Measurements of $γp \rightarrow K^{+} Λ$ and $γp \rightarrow K^{+} Σ^0$ cross-sections have been obtained with the photon tagging facility and the Crystal Ball calorimeter at MAMI-C. The measurement uses a novel $K^+$ meson identification technique in which the weak decay products are characterized using the energy and timing characteristics of the energy deposit in the calorimeter, a method that has the potential to be applied at many other facilities. The fine center-of-mass energy ($W$) resolution and statistical accuracy of the new data results in a significant impact on partial wave analyses aiming to better establish the excitation spectrum of the nucleon. The new analyses disfavor a strong role for quark-diquark dynamics in the nucleon.

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T. C. Jude, D. I. Glazier, D. P. Watts, P. Aguar-Bartolome, L. K. Akasoy, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. S. Bekrenev, H. Berghauser, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, B. T. Demissie, M. Dieterle, E. J. Downie, L. V. Fil'kov, R. Gregor, E. Heid, D. Hornidge, I. Jaegle, O. Jahn, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, A. A. Koulbardis, S. P. Kruglov, B. Krusche, V. Lisin, K. Livingston, I. J. D. MacGregor, Y. Maghrbi, D. M. Manley, Z. Marinides, T. Mart, M. Martinez, J. C. McGeorge, E. F. McNicoll, D. G. Middleton, A. Mushkarenkov, B. M. K. Nefkens, A. Nikolaev, V. A. Nikonov, M. Oberle, M. Ostrick, P. B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, J. Robinson, G. Rosner, T. Rostomyan, A. V. Sarantsev, S. Schumann, M. H. Sikora, D. I. Sober, A. Starostin, I. Strakovsky, I. M. Suarez, I. Supek, M. Thiel, A. Thomas, M. Unverzagt, D. Werthmueller, L. Witthauer, F. Zehr. 2014-07-03. $K^+Λ$ and $K^+Σ^0$ photoproduction with fine center-of-mass energy resolution. https://doi.org/10.1016/j.physletb.2014.06.015

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