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学术报告

The high-energy photoproduction at GlueX: the states and outlook(GlueX上高能光产生实验的现状与展望)

by Dr Zhenyu Zhang (Wuhan University)

Asia/Shanghai
A418

A418

Description
Abstract: The high-energy photoproduction is a prime tool for studying the hadron spectroscopy and understanding strong force in the non-perturbative QCD region. It can provide constraints on the quantum mechanical amplitudes to extract the spectrum of excited baryons at low energy and information on the dominant meson production mechanism at high energy. Using the coherent bremsstrahlung technique, the GlueX Experiment at the 12-GeV-upgraded Jefferson Lab produces a 9 GeV linearly polarized photon beam. The long-term aim of the GlueX experiment is to understand quark-gluon interactions and to search for exotic hybrid mesons. GlueX has been data taking in high-energy meson photoproduction since last spring, and a broad meson photoproduction program is under analysis. The first physics paper on the beam asymmetry Σ in high-energy π0/η photoproduction has been published in PRC(R). In this talk, we will report the status of the GlueX experiment and the results on π0/η photoproduction, then review other preliminary results for high-energy light meson photoproduction at GlueX. 报告摘要: 高能光产生过程有助于对强子谱及非微扰区强力的理解,约束振幅及重⼦共振态参数,研究介子的产生机制,也是寻找QCD奇异态潜在的重要手段。2015年底杰斐逊实验室完成12 GeV 能量升级,GlueX是位于升级后新建的D实验大厅的大型谱仪。GlueX利用相干轫致辐射技术,用12 GeV能量的电子打钻石产生高能极化𝛾光子,再用极化𝛾光子轰击液氢靶,其主要物理目标是研究夸克胶子相互作用,寻找奇异混杂态。2016年春GlueX开始升级后的取数,2017年春关于pi0/eta光产生过程束流不对称度的测量结果作为Rapid Communication发表在Phys. Rev. C上,这既是GlueX合作组,也是杰斐逊实验室在完成12 GeV升级计划后的第一篇物理测量文章。本报告将简单回顾轻强子谱学,介绍GlueX实验现状,pi0/eta光产生过程的实验结果、以及其他正在研究的光产生过程的初步结果,并展望合作组未来的升级及研究计划。 报告人简介: 张振宇,武汉大学物理科学与技术学院副教授。2000年武汉大学物理系本科毕业,2006年武汉大学物理科学与技术学院理学博士毕业。现主持武汉大学北京正负电子对撞机/北京谱仪III和美国托马斯·杰斐逊国家实验室的GlueX国际合作组轻强子谱学研究,并参与了武汉大学江门地下中微子实验国际合作研究。
Slides