Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A comment on lepton mixing   Since right-handed neutrinos, if added to the Standard Model, have no gauge
interactions, their kinetic terms can be mixed. I examine the related rotations
of the gauge eigenstates in order to derive the propagators for the kinetic and
mass terms, and I comment on the resulting lepton mixing, on the possibility of
not having well-defined mass eigenstates, and on the modifications to weak
contributions and observables (anomalous magnetic moment, muon decay, neutrino
oscillations).

4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph