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Title: Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study

When neutrino masses arise from the exchange of neutral heavy leptons, as in most seesaw schemes, the effective lepton mixing matrix N describing neutrino propagation is non-unitary, hence neutrinos are not exactly orthonormal. New CP violation phases appear in N that could be confused with the standard phase $${\delta }_{\mathrm{CP}}$$ characterizing the three neutrino paradigm.We study the potential of the long-baseline neutrino experiment DUNE in probing CP violation induced by the standard CP phase in the presence of non-unitarity. In order to accomplish this we develop our previous formalism, so as to take into account the neutrino interactions with the medium, important in long baseline experiments such as DUNE. In this study we find that the expected CP sensitivity of DUNE is somewhat degraded with respect to that characterizing the standard unitary case. However the effect is weaker than might have been expected thanks mainly to the wide neutrino beam. We also investigate the sensitivity of DUNE to the parameters characterizing non-unitarity. In this case we find that there is no improvement expected with respect to the current situation, unless the near detector setup is revamped.
 [1] ; ORCiD logo [2] ;  [3] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Univ. of Valencia (Spain). Inst. of Corpuscular Physics and AHEP Group
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Center for Neutrino Physics
  3. Inst. Politecnico Nacional (IPN), Zacatenco (Mexico). Centro de Investigacion y de Estudios Avanzados (CINVESTAV). Physics Dept.
Publication Date:
Grant/Contract Number:
SC0013632; FPA2014-58183-P; CSD2009-00064; SEV-2014-0398; PROMETEOII/2014/084; GV2016-142; 166639; SC0009973
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 9; Journal ID: ISSN 1367-2630
IOP Publishing
Research Org:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE; Ministry of Economy, Industry and Competitiveness (MINECO) (Spain); National Council of Science and Technology (CONACyT) (Mexico); Generalitat Valenciana (Spain); Universities Research Association (URA)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; neutrino masses and mixings; neutrino oscillations; neutrino interactions
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1425732