K+ Lambda and K+ Sigma(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. Berghaeuser, 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, 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 gamma p -> K+ Lambda and gamma p -> K+ Sigma(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.(C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

Original languageEnglish
Pages (from-to)112-118
Number of pages7
JournalPhysics Letters B
Volume735
DOIs
Publication statusPublished - 30 Jul 2014

Keywords

  • Photoproduction
  • Strangeness
  • Baryon spectroscopy
  • PHOTON ENERGIES
  • GAMMA-P
  • RESONANCES
  • NUCLEON
  • REGION
  • KAON

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