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Light Active and Sterile Neutrinos from Compositeness


Neutrinos can have naturally small Dirac masses if the Standard Model singlet right-handed neutrinos are light composite fermions. Theories which produce light composite fermions typically generate many of them, three of which can marry the left-handed neutrinos with small Dirac masses. The rest can serve as sterile states which can mix with the Standard Model neutrinos. We present explicit models illustrating this idea. %We present explicit models that produce light active and %sterile neutrinos and show how realistic masses %and active--sterile mixing angles can arise.

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