Spin-Density Matrix Elements forγp→K*0Σ+atEγ=1.85–3.0  GeVwith Evidence for theκ(800)Meson Exchange

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

doi:10.1103/physrevlett.108.092001

Spin-Density Matrix Elements forγp→K*0Σ+atEγ=1.85–3.0 GeVwith Evidence for theκ(800)Meson Exchange

S H Hwang, T Ishikawa + Show 41 more

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https://doi.org/10.1103/physrevlett.108.092001

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Journal: Physical Review Letters	Publication Date: Feb 27, 2012
Citations: 25	License type: publisher-specific-oa

Affiliation: Pusan National University, Tohoku University, Osaka University, Tokyo Institute of Technology, Japan Atomic Energy Agency, Institute of Physics, Academia Sinica, Japan Synchrotron Radiation Research Institute, University of Saskatchewan, University of Connecticut, Ohio University, Seoul National University, Gifu University, RIKEN, Wakayama Medical University, Kyoto University, High Energy Accelerator Research Organization, Fukui Red Cross Hospital, Kyungpook National University

#Natural-parity Exchange #Scalar Meson + Show 8 more

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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.

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