New experiments reveal possible η′-mesic nuclei, offering evidence that particle masses shift inside nuclear matter and shedding light on how mass originates from vacuum structure.
Almost everything around us has mass, but its origin is still a fundamental question in physics. Current theory suggests that mass comes from the properties of the vacuum, which is not truly empty but filled with a complex underlying structure.
One way to explore this idea is by studying mesons, which are particles made of a quark and an antiquark, bound to atomic nuclei. These systems, called mesic nuclei, offer insight into how mass is generated and how the vacuum behaves. New experimental results have brought scientists closer to understanding this process by examining a previously unobserved type of mesic nucleus.
An international team of researchers has now reported evidence for a predicted but never-before-seen exotic state known as an η′-mesic nucleus. Their findings were published in Physical Review Letters.
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