Differential cross section of γ n → K+ Σ- on bound neutrons with incident photons from 1.1 to 3.6 GeV

S. Anefalos Pereira, M. Mirazita, P. Rossi, E. De Sanctis, G. Niculescu, I. Niculescu, S. Stepanyan, K. P. Adhikari, M. Aghasyan, M. Anghinolfi, H. Baghdasaryan, J. Ball, M. Battaglieri, B. L. Berman, A. S. Biselli, C. Bookwalter, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. BurkertS. L. Careccia, D. S. Carman, P. L. Cole, P. Collins, V. Crede, A. D'Angelo, A. Daniel, N. Dashyan, R. De Vita, A. Deur, B. Dey, S. Dhamija, R. Dickson, C. Djalali, D. Doughty, M. Dugger, R. Dupre, A. El Alaoui, P. Eugenio, S. Fegan, T. A. Forest, M. Y. Gabrielyan, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, R. W. Gothe, K. A. Griffioen

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22 Scopus citations

Abstract

Differential cross sections of the reaction γ d → K+ Σ- (p) have been measured with the CLAS detector at Jefferson Lab using incident photons with energies between 1.1 and 3.6 GeV. This is the first complete set of strangeness photoproduction data on the neutron covering a broad angular range. At energies close to threshold and up to Eγ ∼ 1.8 GeV, the shape of the angular distribution is suggestive of the presence of s-channel production mechanisms. For Eγ > 1.8 GeV, a clear forward peak appears and becomes more prominent as the photon energy increases, suggesting contributions from t-channel production mechanisms. These data can be used to constrain future analysis of this reaction.

Original languageEnglish (US)
Pages (from-to)289-293
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume688
Issue number4-5
DOIs
StatePublished - May 10 2010

Bibliographical note

Funding Information:
We would like to acknowledge the outstanding efforts of the staff of the Accelerator and the Physics Divisions at JLab that made this experiment possible. This work was supported in part by the Italian Istituto Nazionale di Fisica Nucleare , the French Centre National de la Recherche Scientifique and the Commissariat à l'Energie Atomique , the U.S. Department of Energy and the National Science Foundation , the National Research Foundation of Korea , and the UK Science and Technology Facilities Council (STFC) . The Southeastern Universities Research Association (SURA) operated the Thomas Jefferson National Accelerator Facility for the United States Department of Energy under contract DE-AC05-84ER40150 during this work.

Keywords

  • Hyperon
  • Missing resonances
  • Nucleon resonance
  • Photoproduction
  • Strangeness

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