[Halld-jlab] Hall D Staff Position Seminar (Alexander Austregesilo)

[Rachel Harris]

The title is "Understanding Strong-Interaction Phenomenology through Hadron Spectroscopy"



In recent years, advances in the theoretical understanding of the strong interaction and new methods for extracting the hadron spectrum from numerical simulations have greatly revived the interest in hadron spectroscopy. In addition, new experiments started to deliver high-precision data, often revealing unexpected signatures for states beyond the constituent quark model. As part of a global effort, GlueX at Jefferson Lab aims to study the light meson spectrum with an emphasis on the search for light hybrid mesons. Its unique selling point is a linearly-polarized 9 GeV photon beam that impinges on a hydrogen target contained within a hermetic detector with near-complete neutral and charged particle coverage. The experiment completed its first phase of data taking in 2018, and the quantity and precision of the data already exceed previous experiments for polarized photoproduction in this energy regime by orders of magnitude. A selection of early results is presented, focusing on the phenomenology of the production process with polarized photons. The potential to make significant contributions to the field of light-meson spectroscopy is demonstrated highlighting prominent examples. With significant upgrades to the detector, the upcoming second phase of GlueX will enable the exploration of the light meson spectrum with rare processes and final states with strangeness content.

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