We investigate the ability of the short baseline neutrino (SBN) experimental program at Fermilab
to test the globally-allowed (3 þ N) sterile neutrino oscillation parameter space. We explicitly consider
the globally-allowed parameter space for the (3 þ 1), (3 þ 2), and (3 þ 3) sterile neutrino oscillation
scenarios. We find that SBN can probe with 5σ sensitivity more than 85%, 95% and 55% of
the parameter space currently allowed at 99% confidence level for the (3 þ 1), (3 þ 2) and (3 þ 3)
scenarios, respectively, with the (3 þ N) allowed space used in these studies closely resembling that of
previous studies [J. M. Conrad, C. M. Ignarra, G. Karagiorgi, M. H. Shaevitz, and J. Spitz, Adv. High
Energy Phys. 2013, 1 (2013).], calculated using the same methodology. In the case of the (3 þ 2) and
(3 þ 3) scenarios, CP-violating phases appear in the oscillation probability terms, leading to observable
differences in the appearance probabilities of neutrinos and antineutrinos. We explore SBN’s sensitivity to
those phases for the (3 þ 2) scenario through the currently planned neutrino beam running, and
investigate potential improvements through additional antineutrino beam running. We show that, if
antineutrino exposure is considered, for maximal values of the (3 þ 2) CP-violating phase ϕ54, SBN
could be the first experiment to directly observe ∼2σ hints of CP violation associated with an extended
lepton sector.

/pdf/prospects-of-light-sterile-neutrino-oscillation-and-cp-4ypfvbfbwz.pdf

Prospects of light sterile neutrino oscillation and CP violation searches at the Fermilab Short Baseline Neutrino Facility

Since the discovery of non-zero neutrino masses, through the observation of neutrino flavour oscillations, we had a plethora of successful experiments which have made increasingly precise measurements of the mixing angles and mass-differences that drive the phenomena In this thesis we highlight the fact that there is still significant room for new physics, however, when one removes the assumption of unitarity of the 3x3 neutrino mixing matrix, an assumption inherent in the 3ν paradigm We refit all global data to show just how much non-unitarity is currently allowed The canonical way that such a non-unitarity is introduced to the 3x3 neutrino mixing matrix is by the addition of additional neutral fermions, singlets under the Standard Model gauge group These “Sterile Neutrinos” have a wide range of the-
oretical and phenomenological implications Alongside the sensitivity non-unitarity measurements have to sterile neutrinos, in this thesis we will study in detail two
additional signatures of low-scale sterile neutrinos; the case of one or more light O(1eV) sterile neutrinos detected by their effect on neutrino flavour oscillations,
and heavier O(100 MeV) detected via their subsequent decay to Standard Model particles These two regimes have markedly different phenomenology, but are both measurable at terrestrial short-baseline experiments We consistently use the Fermilab Short-Baseline Neutrino program as a concrete example which would produce world-leading bounds in both scenarios

A multi-signature approach to low-scale sterile neutrino phenomenology

/pdf/the-energy-spectrum-of-reactor-antineutrinos-4gdl09n0wg.pdf

The Energy Spectrum of Reactor Antineutrinos

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The Energy Spectrum of Reactor Antineutrinos