Round 9: Tossup 12

A background of these particles has its temperature related by a factor (15[2])of “the cube root of four-elevenths” to the temperature (15[1])of the CMB and is made up of their “relic” type, which decoupled a second after the Big Bang. (15[1])SNEWS detects these (15[1])dominant particles (15[1])released in supernovas. A prominent dark matter candidate is the “sterile” type of these (-5[1])particles. These particles’ (*) solar flux was only one-third (10[1])of the initially predicted value due to their flavor oscillations. Super-Kamiokande detects these particles, which along with a positron is emitted in beta-plus decay. Electron, muon, and tau are varieties of, for 10 points, what near-massless, (10[1])neutrally charged particles? ■END■

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