Abstract
We study the capabilities of the short baseline neutrino program at Fermilab to probe the unitarity of the lepton mixing matrix. We find the sensitivity to be slightly better than the current one. Motivated by the future DUNE experiment, we have also analyzed the potential of an extra liquid Argon near detector in the LBNF beamline. Adding such a near detector to the DUNE setup will substantially improve the current sensitivity on non-unitarity. This would help to remove CP degeneracies due to the new complex phase present in the neutrino mixing matrix. We also study the sensitivity of our proposed setup to light sterile neutrinos for various configurations.
Highlights
The preparation and execution of the DUNE program occupies a central position in the agenda of neutrino physics experimentation over the coming decades [1,2]
In order to take into account the above features, we have considered three possible configurations for the proposed second near detector at the Long-Baseline Neutrino Facility (LBNF) beam: (1) ICARUS at LBNF: This is exactly the ICARUS detector of the Short Baseline Neutrino Experiment (SBNE), working with energies between 0 to 3 GeV, located at the LBNF beamline
We have analyzed in this case the sensitivity to the so-called zero distance effect
Summary
The preparation and execution of the DUNE program occupies a central position in the agenda of neutrino physics experimentation over the coming decades [1,2]. The main goal of such an effort has been to confirm or definitely, rule out the sterile neutrino hints observed in the muon neutrino beam experiments LSND and MiniBooNE [3] While this provides a strong motivation, there are others, of a more theoretical nature [4], that can further justify the efforts of a comprehensive short-baseline physics program at Fermilab [5,6]. Our goal in this paper is to study how the short-baseline neutrino program at Fermilab could help DUNE to break the degeneracy in the measurement of the CP violation phase associated with the nonunitarity of the lepton mixing matrix. As a result, improved constraints on the nonunitarity of the neutrino mixing matrix from shortdistance measurements would be crucial for the Long Baseline Neutrino program, as it will help to disentangle the confusion between the different CP phases appearing in the neutrino mixing matrix in the nonunitary case [17,18]
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