NPA Zoom Seminar, Ho San Ko, LBL, “Accessing Generalized Parton Distributions at Jefferson Lab”

Event time: 
Thursday, November 12, 2020 - 1:00pm to 2:00pm
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Event description: 

An exciting scientific frontier is the 3-dimensional exploration of nucleon (and nuclear) structure: nuclear femtography. The study of Generalized Parton Distributions (GPDs) captures the images of the transverse position distributions of fast moving quarks. Therefore, they provide richer information about the nucleon structure than the well known form factors and parton distribution functions. GPDs are accessible via exclusive reactions, where all particles in the final state are identified. In this talk, deeply virtual Compton scattering (DVCS) and deeply virtual π0 production (DVMP) will be discussed. The presentation will be divided into three parts: data analysis, development of a detector, and a short preview of a new scintillator material. With an 11 GeV electron beam and a proton target at Jefferson Lab, a precise DVCS and DVMP experiment in the valence quark region was performed. The data analysis and preliminary results of this experiment will be presented in the first part of the talk. An upcoming experiment will give more constraints on the extraction of GPDs. For this new experiment, a neutral particle spectrometer (NPS) is under development. In the second part of the talk, simulation studies and hardware developments for the NPS calorimeter will be presented. Finally, the radiation hardness of a new glass scintillator will be shortly discussed. This material, which is in an early stage of development, is one of the candidates for the calorimeters of a future Electron-Ion Collider (EIC).
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