New limits on radiative sterile neutrino decays from a search for single photons in neutrino interactions

Details New limits on radiative sterile neutrino decays from a search for single photons in neutrino interactions New limits on radiative sterile neutrino decays from a search for single photons in neutrino interactions

2012-01-25

arxiv.org/abs/1201.5194v2

Phys. Lett. B710 (2012) 86-90

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures. Revised version to appear in PLB. Discussion of dominant NC-like production of \nu_h's added

Scientific paper

10.1016/j.physletb.2012.02.071

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 \nu_h produced in \nu_\mu neutral current-like interactions. If the \nu_h exist, it would be also produced by the \nu_\mu beam from the CERN SPS in the neutrino beam line shielding. The \nu_h's would penetrate the shielding and be observed through the decay \nu_h -> \nu \gamma, followed by the photon conversion into e+e- pair in the active target of the NOMAD detector. The \nu_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 \nu_h's we set new constraints on \nu_h properties and exclude part of the LSND/MiniBooNE \nu_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 \nu_h in future neutrino experiments.

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