Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative Decays of Cosmic Background Neutrinos in Extensions of MSSM
  with a Vector Like Lepton Generation   An analysis of radiative decays of the neutrinos $\nu_j\to \nu_l \gamma$ is
discussed in MSSM extensions with a vector like lepton generation. Specifically
we compute neutrino decays arising from the exchange of charginos and charged
sleptons where the photon is emitted by the charged particle in the loop. It is
shown that while the lifetime of the neutrino decay in the Standard Model is
$\sim 10^{43}$ yrs for a neutrino mass of 50 meV, the current lower limit from
experiment from the analysis of the Cosmic Infrared Background is $\sim
10^{12}$ yrs and thus beyond the reach of experiment in the foreseeable future.
However, in the extensions with a vector like lepton generation the lifetime
for the decays can be as low as $\sim 10^{12}- 10^{14}$ yrs and thus within
reach of future improved experiments. The effect of CP phases on the neutrino
lifetime is also analyzed. It is shown that while both the magnetic and the
electric transition dipole moments contribute to the neutrino lifetime, often
the electric dipole moment dominates even for moderate size CP phases.

9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
3
The categories of this paper are: physics