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The structure of pentaquarks has been studied

16.06.2019

Exotic subatomic particles called pentaquarks contain five smaller particles - quarks and antiquarks. But these particles are not just an accumulation of five components. Pentaquarks are molecular-like agglomerations of a pair of smaller particles, one of which consists of three quarks, and the other of a quark and an antiquark.

First discovered in 2015 at the Large Hadron Collider in Geneva, pentaquarks were unlike anything before. All previous known particles containing quarks were either baryons—particles such as protons and neutrons that contain three quarks—or mesons, which are composed of one quark and one antiquark. But pentaquarks, with their five component particles, did not fit into any of these categories.

"There was no clear picture of how pentaquarks are built," says particle physicist Tomasz Skwarnicki of Syracuse University in New York, co-author of the study.

Some scientists believed that the five components can be combined on an equal footing. But detailed measurements show that pentaquarks are made of two known particles, the baryon and the meson, glued together. This discovery makes the particles a little less exotic than intended.

Nevertheless, the result reveals new facets of elementary particle physics: before that, it was not clear that baryons and mesons could combine with each other at all.

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