K +Λ and K +σ0 photoproduction with fine center-of-mass energy resolution

T. C. Jude, D. I. Glazier, D. P. Watts, P. Aguar-Bartolomé, L. K. Akasoy, J. R.M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. S. Bekrenev, H. Berghäuser, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, B. T. Demissie, M. Dieterle, E. J. Downie, L. V. Fil'kovR. 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, Terry 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. Werthmüller, L. Witthauer, F. Zehr

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Abstract

Measurements of γp→K +Λ and γp→K +σ0 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.

Original languageEnglish
Pages (from-to)112-118
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume735
DOIs
Publication statusPublished - 30 Jul 2014

Keywords

  • Baryon spectroscopy
  • Photoproduction
  • Strangeness

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    Jude, T. C., Glazier, D. I., Watts, D. P., Aguar-Bartolomé, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V. S., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Demissie, B. T., Dieterle, M., Downie, E. J., ... Zehr, F. (2014). K +Λ and K +σ0 photoproduction with fine center-of-mass energy resolution. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 735, 112-118. https://doi.org/10.1016/j.physletb.2014.06.015