Two-Generation Neutrino Oscillations

• Quantum interference between states with two different masses:

• Two parameters:

• ¢m2—difference of masses squared. Governs oscillation frequency in L/E
• µ—amount of mixing. Governs oscillation amplitude

In matter (gas of electrons), ºe has additional CC Feynman diagrams (different indices of refraction between ºe and º¹ , º¿)

⇒ Matter effects (in Sun, etc) can modify ¢m2 and µ