Correlated, precision measurements of θ23 and δ using only the electron neutrino appearance experiments

Hisakazu Minakata and Stephen J. Parke
Phys. Rev. D 87, 113005 – Published 4 June 2013

Abstract

Precision measurement of the leptonic CP violating phase δ will suffer from the, then surviving, large uncertainty of sin2θ23 of 10–20% in the experimentally interesting region near maximal mixing of θ23. We advocate a new method for determination of both θ23 and δ at the same time using only the νe and ν¯e appearance channels and show that sin2θ23 can be determined automatically with much higher accuracy, approximately a factor of six, than sinδ. In this method, we identify a new degeneracy for the simultaneous determination of θ23 and δ, the θ23 intrinsic degeneracy, which must be resolved in order to achieve precision measurement of these two parameters. Spectral information around the vacuum oscillation maxima is shown to be the best way to resolve this degeneracy.

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  • Received 4 April 2013

DOI:https://doi.org/10.1103/PhysRevD.87.113005

© 2013 American Physical Society

Authors & Affiliations

Hisakazu Minakata*,† and Stephen J. Parke

  • Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA

  • *Present address: Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, C. P. 38071, 22452-970, Rio de Janeiro, Brazil.
  • hisakazu.minakata@gmail.com
  • parke@fnal.gov

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Issue

Vol. 87, Iss. 11 — 1 June 2013

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