Spin-density matrix elements for γp→K*0Σ+ at Eγ=1.85-3.0 GeV with evidence for the κ(800) meson exchange

Authors :: 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, Kon
H 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
Source :: Physical review letters. 108(9)
Publication Year :: 2011
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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