Violating Parity with Quarks and Gluons

Hey, nobody told me that having a blog would involve homework. But here's Jerry Coyne, nudging me into talking about a story in this morning's New York Times. Fortunately it's interesting enough to be worth taking a swipe at. The news is an interesting result from RHIC, the Relativistic Heavy Ion Collider at Brookhaven Lab on Long Island. RHIC has been quite the source of surprising new results since it turned on in 2000. It's not the highest-energy collider in the world, nor did it ever aim to be; instead, it creates novel conditions by smashing together the nuclei of gold atoms. Gold nuclei have lots of particles -- 79 protons and 118 neutrons -- so the collisions make a soup known as the quark-gluon plasma. (We ordinarily think of a proton or neutron as consisting of three quarks, but those are just the "valence" quarks that are always there. ...