Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinetic mixing and symmetry breaking dependent interactions of the dark
  photon   We examine spontaneous symmetry breaking of a renormalisable U(1) x U(1)
gauge theory coupled to fermions when kinetic mixing is present. We do not
assume that the kinetic mixing parameter is small. A rotation plus scaling is
used to remove the mixing and put the gauge kinetic terms in the canonical
form. Fermion currents are also rotated in a non-orthogonal way by this basis
transformation. Through suitable redefinitions the interaction is cast into a
diagonal form. This framework, where mixing is absent, is used for subsequent
analysis. The symmetry breaking determines the fermionic current which couples
to the massless gauge boson. The strength of this coupling as well as the
couplings of the massive gauge boson are extracted. This formulation is used to
consider a gauged model for dark matter by identifying the massless gauge boson
with the photon and the massive state to its dark counterpart. Matching the
coupling of the residual symmetry with that of the photon sets a lower bound on
the kinetic mixing parameter. We present analytical formulae of the couplings
of the dark photon in this model and indicate some physics consequences.

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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: adap-org