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This question already has an answer here:

Standard model shows zero mass for neutrino and seesaw model explains why the neutrino mass is so small. But to show that the neutrino mass is small, the mass should be originated by some mechanism. If this mechanism is not higgs mechanism then what is it? Kindly please provide the mathematical calculations associated with it.

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marked as duplicate by anna v particle-physics Apr 24 at 6:36

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ I marked it as a duplicate because the link describes and gives links for where we are with the mass of the neutrino $\endgroup$ – anna v Apr 24 at 6:37