Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Loop-level corrections to the neutrino mass

  1. Apr 16, 2012 #1
    Hi,

    Quick question. In the SM, why can't we have loop-level interactions that give neutrinos their small masses?
    (It seems like we must also have Majorana neutrinos)


    Thanks.
     
    Last edited: Apr 16, 2012
  2. jcsd
  3. Apr 16, 2012 #2
    Giving neutrinos a Dirac mass requires there to be right-handed neutrinos and giving them Majorana masses requires a source of explicit lepton number violation. The standard model has neither of these*; so, it can't generate any sort of neutrino masses.

    *Well, strictly, the SM does have non-perturbative lepton number violation; but, only with a compensating violation of baryon number that leaves B-L conserved. Majorana mass requires that this be broken as well.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Loop-level corrections to the neutrino mass
  1. Neutrino mass (Replies: 7)

  2. Neutrino mass (Replies: 4)

  3. Mass of Neutrino (Replies: 4)

Loading...