在GlueX上三π系统中搜索 $\boldsymbol{\pi_1(1600)}$
Search for $\boldsymbol{π_1(1600)}$ in a three-pion system at GlueX
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中文总结 AI 辅助
GlueX实验利用线偏振光子束，通过分波分析三π系统，搜索具有奇异量子数的混合介子$\pi_1(1600)$，旨在确立$\rho\pi^-$ P波中的共振$1^{-+}$贡献。
中文摘要 AI 辅助
位于杰斐逊实验室D厅的GlueX实验能够利用线偏振光子束在$\gamma p$相互作用中研究轻介子谱。GlueX特别旨在搜索具有奇异量子数、因此不能归类为传统强子的混合介子。我们通过对从$\Delta^{++}$重子产生的$\pi^{+}\pi^{-}\pi^{-}$系统进行分波分析，展示了$\pi_1(1600)$介子的搜索。选定的三π末态数据在$m_{3\pi}$的区间内，作为在反射率基中定义的分波振幅的相干和进行拟合。通过提取的$\rho\\,\pi^{-}$ $D$波中的信号，研究了$a_{2}^{-}(1320)$产生的性质。在本分析中，将为每个模型贡献提取整体的$m_{3\pi}$线形。主要兴趣在于确立在$\rho\\,\pi^{-}$ $P$波构型中存在共振的$1^{-+}$贡献。
英文摘要
The GlueX experiment in Hall D at Jefferson Lab enables studies of the light meson spectrum in $γp$ interactions with a linearly polarized photon beam. GlueX aims in particular to search for hybrid mesons that have exotic quantum numbers and therefore cannot be classified as conventional hadrons. We present the search for the $π_1(1600)$ meson by means of a partial-wave analysis of the $π^{+}π^{-}π^{-}$ system produced off the $Δ^{++}$-baryon. Data with the selected three-pion final state are fitted in bins of $m_{3π}$ as coherent sums of partial-wave amplitudes defined in the reflectivity basis. The properties of $a_{2}^{-}(1320)$ production are investigated through the extracted signal in the $ρ\,π^{-}$ $D$-waves. In this analysis, the overall $m_{3π}$ lineshape will be extracted for each of the model contributions. The main interest lies in establishing the existence of a resonant $1^{-+}$ contribution in the $ρ\,π^{-}$ $P$-wave configuration.
发表机构
- Ruhr-Universität Bochum（波鸿鲁尔大学）
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