Unique Neutrino Mass Operator at any Mass Dimension

Details Unique Neutrino Mass Operator at any Mass Dimension Unique Neutrino Mass Operator at any Mass Dimension

2010-09-09

arxiv.org/abs/1009.1692v2

Phys.Lett.B694:346-348,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 1 figure; v2: modified/added a few sentences, more acknowledgement, added a ref to [7] and a new [8], typos fixed, pr

Scientific paper

10.1016/j.physletb.2010.10.005

When the standard model is viewed as a low energy effective theory, the neutrinos can obtain mass from higher dimensional operators. It has been known for long that such an operator first appears at mass dimension five and that it is unique. Here we show that the effective neutrino mass operator at every higher dimension is unique. This general claim is established using Young tableau, and illustrated by exhausting all potentially different operators at dimension seven. The result is relevant to the search of new physics effects beyond neutrino mass that can arise at a relatively low energy scale.

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