Spin-density matrix elements for γp→K *+ at E γ=1.85-3.0GeV with evidence for the κ(800) meson exchange

S. H. Hwang, K. Hicks, J. K. Ahn, T. Nakano, D. S. Ahn, W. C. Chang, J. Y. Chen, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, S. Fukui, W. Gohn, T. Hotta, K. Imai, T. Ishikawa, K. Joo, Y. Kato, H. Kohri, Y. KonH. S. Lee, Y. Maeda, M. Miyabe, T. Mibe, Y. Morino, N. Muramatsu, Y. Nakatsugawa, M. Niiyama, H. Noumi, Y. Oh, Y. Ohashi, T. Ohta, M. Oka, J. Parker, C. Rangacharyulu, S. Y. Ryu, T. Sawada, Y. Sugaya, M. Sumihama, T. Tsunemi, M. Uchida, M. Ungaro, M. Yosoi

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20 Citations (Scopus)


The exclusive reaction γp→K +π -Σ + was measured for the first time using linearly polarized photons at beam energies from 1.85 to 2.96 GeV. Angular distributions in the rest frame of the K +π - system were fitted to extract spin-density matrix elements of the K *0 decay. The measured parity spin asymmetry shows that natural-parity exchange is dominant in this reaction. This result clearly indicates the need for t-channel exchange of the κ(800) scalar meson.

Original languageEnglish
Article number092001
JournalPhysical review letters
Issue number9
Publication statusPublished - 2012 Feb 27
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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