Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parametrization of Seesaw Models and Light Sterile Neutrinos   The recent recomputation of the neutrino fluxes from nuclear reactors relaxes
the tension between the LSND and MiniBooNE anomalies and disappearance data
when interpreted in terms of sterile neutrino oscillations. The simplest
extension of the Standard Model with such fermion singlets is the addition of
right-handed sterile neutrinos with small Majorana masses. Even when
introducing three right-handed neutrinos, this scenario has less free
parameters than the 3+2 scenarios studied in the literature. This begs the
question whether the best fit regions obtained can be reproduced by this
simplest extension of the Standard Model. In order to address this question, we
devise an exact parametrization of Standard Model extensions with right-handed
neutrinos. Apart from the usual 3x3 neutrino mixing matrix and the 3 masses of
the lightest neutrinos, the extra degrees of freedom are encoded in another 3x3
unitary matrix and 3 additional mixing angles. The parametrization includes all
the correlations among masses and mixings and is valid beyond the usual seesaw
approximation. Through this parametrization we find that the best fit regions
for the LSND and MiniBooNE anomalies in a 3+2 scenario can indeed be reproduced
despite the smaller number of degrees of freedom.

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The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
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The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin