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Vector meson photoproduction studied in its radiative decay channel

机译:矢量介子光产生在其辐射衰减通道中的研究

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摘要

We provide an analysis of vector meson photoproduction in the channel of the vector meson decaying into a pseudoscalar meson plus a photon, i.e. $V\to P\gamma$. It is shown that non-trivial kinematic correlations arise from the measurement of the $P\gamma$ angular distributions in the overall c.m. system in comparison with those in the vector-meson-rest frame. In terms of the vector meson density matrix elements, the implication of such kinematic correlations in the measurement of polarization observables is discussed. For the $\omega$ meson production, due to its relatively large branching ratios for $\omega\to\pi^0\gamma$, additional events from this channel may enrich the information about the reaction mechanism and improve the statistics of the recent measurement of polarized beam asymmetries by the GRAAL Collaboration. For $\phi\to \eta\gamma$, $\rho\to \pi\gamma$, and $K^*\to K\gamma$, we expect that additional information about the spin structure of the vector meson production vertex can be derived.
机译:我们提供了在矢量介子衰变为伪标量介子加光子即$ V \至P \γ$的通道中矢量介子光产生的分析。结果表明,在整个坐标系中,对$ P \γ$角分布的测量产生了非平凡的运动学相关性。与矢量介子静止框架中的系统相比。根据矢量介子密度矩阵元素,讨论了这种运动学相关性在极化可观测物测量中的意义。对于$ \ omega $介子产生,由于$ \ omega \至\ pi ^ 0 \ gamma $的分支比例较大,因此来自此通道的其他事件可能会丰富有关反应机理的信息并改善最近的统计信息。 GRAAL协作测量偏振光束不对称性。对于$ \ phi \至\ eta \ gamma $,$ \ rho \至\ pi \ gamma $和$ K ^ * \至K \ gamma $,我们期望关于矢量介子产生顶点的自旋结构的其他信息可以得出。

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