Packet 9: Tossup 12

A background of these particles has its temperature (15[1])related by a factor of (15[1])“the cube root of four-elevenths” to the temperature of the CMB. That background of these particles is made up of their “relic” type, which decoupled a second (15[1])after the Big Bang. (15[2])SNEWS (-5[1])detects these dominant particles released in supernovas. A prominent dark matter candidate is the “sterile” type of these particles. These particles’ (*) solar flux (10[1])was only one-third 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, neutrally charged particles? ■END■

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