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A SeeSaw Type II

  1. Jan 31, 2017 #1
    I would like to understand what is the MΔ which appears in the neutrino mass mechanism with Type-II seesaw. It seems to be the Higgs triplet mass. But I do not understand what is (physically) the masse of this triplet when we define it with 3 components : Δ=(Δ++,Δ+,Δ°). It is different from the Δ° mass ?
  2. jcsd
  3. Jan 31, 2017 #2


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    Unless you provide us with a reference where your notation is introduced, how do you expect anyone to answer this question?
  4. Jan 31, 2017 #3
    You are right. But my question can be reformulated.
    In some theories (see saw II or III), we assume the existence of a scalar SU(2)L triplet defined by Δ=(Δ++,Δ+,Δ°) (=Higgs triplet) or new fermionic SU(2) triplet Σ=(Σ+,Σ°,Σ-). In such models, we refer on the mass of the triplet mΔ or mΣ. My question is that I do not understand how we can speak about the triplet mass (and not about each of its component mass). For comparison, in SU(2)L doublet ψ=(ν,e-) we always refer either on the neutrino mass or electron mass and not on a "mψ" doublet mass. So this triplet mass term (mΣ or mΔ) is difficult for me to understand. Could you help me ?
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