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Type: Artigo de periódico
Title: Searching For A Nondiagonal Mass Varying Mechanism In The νμ-ντ System
Author: Gratieri D.R.
Peres O.L.G.
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=2.45×10-3 eV2, 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. © 2014 American Physical Society.
Editor: American Physical Society
Citation: Physical Review D - Particles, Fields, Gravitation And Cosmology. American Physical Society, v. 90, n. 1, p. - , 2014.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.90.013011
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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