M Ungaro

Publications (1)7.37 Total impact

• Article: Spin-density matrix elements for γp→K*0Σ+ at Eγ=1.85-3.0 GeV 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, [......], 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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  ABSTRACT: 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.
  Physical Review Letters 03/2012; 108(9):092001. · 7.37 Impact Factor