Searching for a nondiagonal mass varying mechanism in the νμντ system

D. R. Gratieri and O. L. G. Peres
Phys. Rev. D 90, 013011 – Published 14 July 2014

Abstract

We use atmospheric neutrino data and MINOS data to constrain the MaVaN (mass varying neutrinos) mechanism. The MaVaN model was largely studied in cosmology scenarios and comes from the coupling of the neutrinos with a neutral scalar depending on the local matter density. For atmospheric neutrinos, this new interaction affects the neutrino propagation inside the Earth, and as consequence, induces modifications in their oscillation pattern. To perform such test for a nonstandard oscillation mechanism with a nondiagonal neutrino coupling in the mass basis, we analyze the angular distribution of atmospheric neutrino events as seen by the Super-Kamiokande experiment for the events in the sub-GeV and multi-GeV range and muon neutrinos (antineutrinos) in the MINOS experiment. From the combined analysis of these two sets of data we obtain the best fit for Δm322=2.45×103eV2, sin2(θ23)=0.42 and MaVaN parameter α32=0.28 with modest improvement, Δχ2=1.8, over the standard oscillation scenario. The combination of MINOS data and Super-Kamiokande data prefers small values of MaVaN parameter α32<0.31 at 90% C. L.

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  • Received 2 June 2014

DOI:https://doi.org/10.1103/PhysRevD.90.013011

© 2014 American Physical Society

Authors & Affiliations

D. R. Gratieri1,2,* and O. L. G. Peres2,3,†

  • 1Instituto de Física e Matemática, Universidade Federal de Pelotas, Caixa Postal 354, CEP 96010-900 Pelotas, Rio Grande do Sul, Brazil
  • 2Instituto de Física Gleb Wataghin—UNICAMP, 13083-859 Campinas, São Paulo, Brazil
  • 3Abdus Salam International Centre for Theoretical Physics, ICTP, I-34010 Trieste, Italy

  • *gratieri@ifi.unicamp.br
  • orlando@ifi.unicamp.br

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Vol. 90, Iss. 1 — 1 July 2014

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