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Natural Science Forum / Physics / Research / August 2008Inquiry: impact on non-zero neutrino mass on the standard model of
I am interested if there is any change in the status of the standard model of the electro-weak interaction due to the experimentally/observationally confirmed non-zero mass of the neutrinos. Is model still considered valid (i.e. with only minor modifications due to the necessary change of the choice of the SU(2) irreps for the left and right chiral neutrinos), or is that change significant enought to upset the consistency and minimality of the model? Please send me any pointers to the relevant published papers (or to any other type of sources). Thank you, John Hi John, It's perfectly straightforward to include nonzero neutrino masses without disrupting the rest of the Standard Model. All one has to do is include a right-handed neutrino, which is a gauge singlet. The Standard Model comes from writing down the most general renormalizable Lagrangian given the particle content. Adding the right- handed neutrino allows one to add Yukawa terms (LH neutrino - Higgs doublet - RH neutrino) which turns into a Dirac mass term upon electroweak symmetry breaking. Thus the leptonic sector mirrors the content and couplings of the quark sector (with different charges). The representations of the Standard Model particles don't change at all, nor do we have to modify any of the Standard Model couplings. A good primer might be the relevant sections of the recent textbook by Burgess and Moore (Introduction to the Standard Model). Cheers, Flip > I am interested if there is any change in the status of the standard > model of the electro-weak interaction due to the [quoted text clipped - 10 lines] > Thank you, > John > Hi John, > > It's perfectly straightforward to include nonzero neutrino masses > without disrupting the rest of the Standard Model. All one has to do > is include a right-handed neutrino, which is a gauge singlet. [snip] Does the physical nonexistence of a right-handed neutrino cause you any discomfort?  SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 Hi. It wouldn't hurt to explain how the Std Model predicts observability of a right-handed neutrino. Like "sterile" neutrinos, it isn't really much use to "predict" a particle which can't be observed. > > Hi John, > > [quoted text clipped - 11 lines] > (Toxic URL! Unsafe for children and most mammals) > http://www.mazepath.com/uncleal/lajos.htm#a2 |
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