Spin-Density Matrix Elements for $￥gamma p ￥to K^{*0} ￥Sigma ^+$ at $E_￥gamma=1.85-3.0$ GeV with Evidence for the $￥kappa(800)$ Meson Exchange
Spin-Density Matrix Elements for $￥gamma p ￥to K^{*0} ￥Sigma ^+$ at $E_￥gamma=1.85-3.0$ GeV with Evidence for the $￥kappa(800)$ Meson Exchange
复制标题
$¥gamma p ¥到 K^{*0} ¥Sigma ^+$ 在 $E_¥gamma=1.85-3.0$ GeV 处的自旋密度矩阵元素以及 $¥kappa(800)$ 介子交换的证据
DOI：
10.1103/physrevlett.108.092001
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
S.H.Hwang;et al
首次用线偏振光子在1.85-2.96 GeV的束能量范围内测量了独占反应。对系统静止标架中的角分布进行拟合，提取衰变的自旋密度矩阵元。测量的宇称自旋不对称性表明，自然宇称交换在该反应中占主导地位。这一结果清楚地表明了通道交换的必要性。
The exclusive reactionwas 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 thesystem were fitted to extract spin-density matrix elements of thedecay. The measured parity spin asymmetry shows that natural-parity exchange is dominant in this reaction. This result clearly indicates the need for-channel exchange of thescalar meson.