Abstract
The high-energy photoproduction of light-quark pseudoscalar and scalar mesons is an effective tool for understanding the properties of strong interaction in the nonperturbative regime. It has been investigated theoretically using Regge-cut phenomenology with massive quasi-particle exchange in the high-energy regime, and the linearly polarized photon beam asymmetry [Formula: see text] can provide insight into the dominant production mechanism. In the low-energy region, it can provide constraints on ”background” to baryon resonance extraction. With an almost 50-year history, intensive experiments on meson photoproduction are growing vigorously at several international laboratories, such as JLab, ELSA, and MAMI. Recently the beam asymmetry [Formula: see text] in high-energy [Formula: see text] photoproduction has been measured at GlueX, which is the first measurement both from the GlueX experiment and the 12 GeV upgraded JLab. The highest precision measurement of the [Formula: see text] asymmetry and the first measurement of [Formula: see text] beam asymmetry at a beam energy above 3 GeV are presented. A broad meson photoproduction project, including scalar meson [Formula: see text], is under way at GlueX. In the proceedings, we report the beam asymmetry results for [Formula: see text] photoproduction at GlueX, as well as preliminary results for scalar meson photoproduction in the [Formula: see text] and [Formula: see text] channels.
Highlights
IntroductionMeson photoproduction has been attracting great interests of researchers in hadron physics recently
Meson photoproduction has been attracting great interests of researchers in hadron physics recently. It can be described by Regge trajectory exchanges at high energy, which has been well understood in pion photoproduction and can been extend to scalar and tensor mesons reasonably1–4
We focus on 2γ and 4γ decays for psuedoscalar meson and scalar meson photoproduction
Summary
Meson photoproduction has been attracting great interests of researchers in hadron physics recently. It can be described by Regge trajectory exchanges at high energy, which has been well understood in pion photoproduction and can been extend to scalar and tensor mesons reasonably. The long-term aim of the GlueX experiment is to understand quark-gluon interactions and to search for exotic hybrid mesons, for which the light meson photoproduction is a promising experimental technique. This is an Open Access article published by World Scientific Publishing Company. The differential cross sections on the proton target can be written in terms of vector or axial-vector Regge amplitudes, dσ dt
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