Science, Space and Technology News 2023
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The most stable, lowest-energy state of a nucleon is called its ground state. But when a nucleon is forcibly excited into a higher-energy state, its quarks rotate and vibrate against each other, exhibiting what’s known as a nucleon resonance. “This is the first time we have some measurement, some observation, which is sensitive to the 3D characteristics of such an excited state,” said Diehl. “In principle, this is just the beginning, and this measurement is opening a new field of research.”The experiment was conducted in Experimental Hall B in 2018-2019 using Jefferson Lab’s CLAS12 detector. A high-energy electron beam was sent into a chamber of cooled hydrogen gas.
Diehl and others recently discussed their results as part of a joint workshop “Exploring resonance structure with transition GPDs” in Trento, Italy. The research has already inspired two theory groups to publish papers on the work.
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