Particle physicists measure the spin contribution of the proton's antiquark
Thursday, August 14, 2014 - 06:00
in Physics & Chemistry
What causes a proton to spin? This fundamental question has been a longstanding mystery in particle physics, although it was once thought that the answer would be fairly straightforward: The spin of a proton's three subatomic particles, called quarks, would simply add up to produce its total spin.