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New limits on radiative sterile neutrino decays from a search for single photons in neutrino interactions | | S. N. Gninenko
; | | Date: |
25 Jan 2012 | | Abstract: | It has been recently shown that excess events observed by the LSND and
MiniBooNE neutrino experiments could be interpreted as a signal from the
radiative decay of a heavy sterile neutrino
u_h produced in
u_mu neutral
current interactions. If the
u_h exist, it would be also produced by the
u_mu beam from the CERN SPS in the neutrino beam line shielding. The
u_h’s
would penetrate the shielding and be observed through the decay
u_h ->
u
gamma, followed by the photon conversion into e+e- pair in the active target
of the NOMAD detector. The
u_h’s could be also produced in the iron of the
magnetic spectrometer of the CHORUS detector, located just in front of NOMAD.
Considering these two sources of
u_h’s we set new constraints on
u_h
properties and exclude part of the LSND/MiniBooNE
u_h parameter space using
bounds on single photons production in neutrino reactions recently reported by
the NOMAD collaboration. We find that broad bands in the parameter space are
still open for more sensitive searches for the
u_h in future neutrino
experiments. | | Source: | arXiv, 1201.5194 | | Services: | Forum | Review | PDF | Favorites | |
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