Monday, June 27, 2016

particle physics - Mixing of quarks, neutrinos... and leptons?


This is a quite simple question: quarks do mix (through the CKM matrix), neutrinos do mix (through the PMNS matrix).


Then why do charged leptons not mix?





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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...