Each quark has a spin of 1/2, so you might simply think that so long as one spins in the opposite direction of the other two, you'd get the proton's spin. Up until the 1980s, that's exactly how ...

Scientists hoping to unravel the mystery of proton spin at the Relativistic Heavy Ion Collider (RHIC), a 2.4-mile-circumference particle accelerator at Brookhaven National Laboratory, have a new ...

At stake is the intrinsic angular momentum, or “spin”, of a proton. Spin is a quantum-mechanical property, akin to the angular momentum of a classical sphere rotating on its axis, except it comes in ...

Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at √s = 510 GeV. Physical Review D . Vol. 99, March 14, 2019, p. 051102. doi:10.1103 ...

The new research shows that gluons, which have a spin of 1, contribute as much as half of the proton’s spin. This was based on proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC).

Each proton contains three smaller quarks that account for roughly one-fifth of its spin, but the particulars of the other four-fifths are still something of a mystery, according to Quanta Magazine.

But as with the quark spin, experiments have shown that gluon spin can only account for a small fraction of the missing proton spin. The remaining proton spin should come from the orbital motion of ...

SpinQuest will be one of the first experiments to directly test whether the sea quarks, through their own orbiting motion, are components of proton spin. The SpinQuest collaboration consists of 50 ...

Gluons each have a spin of 1, and depending on which direction it is they could add up to make most of rest of the proton’s spin. Measuring their contribution is a tricky task.

Somehow, the spin and orbital motion of quarks and gluons within the proton combine to produce its spin of 1/2. Originally, physicists expected that the explanation would be simple.

Spin, an intrinsic angular momentum, is a property of both protons and neutrons (collectively known as nucleons). Until the 1980s, physicists had assumed that the spin-1/2 of both the neutron and the ...