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How a proton gets its spin is surprisingly complicated

Author: Emily Conover / Source: Science News

proton spin
SPIN SURPRISE Protons are composed of smaller particles, called quarks and antiquarks, which contribute angular momentum, or spin. Now scientists report that a rarer type of antiquark adds more to the proton’s spin than a more common variety.

Like a quantum version of a whirling top, protons have angular momentum, known as spin.

But the source of the subatomic particles’ spin has confounded physicists. Now scientists have confirmed that some of that spin comes from a frothing sea of particles known as quarks and their antimatter partners, antiquarks, found inside the proton.

Surprisingly, a less common type of antiquark contributes more to a proton’s spin than a more plentiful variety, scientists with the STAR experiment report March 14 in…

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