Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Searching for a nondiagonal mass varying mechanism in the nu(mu) - nu(tau) system

Full text
Gratieri, D. R. [1, 2] ; Peres, O. L. G. [1, 3]
Total Authors: 2
[1] Inst Fis Gleb Wataghin, UNICAMP, BR-13083859 Campinas, SP - Brazil
[2] Univ Fed Pelotas, Inst Fisica Math, BR-96010 Pelotas, Rio Grande Sul - Brazil
[3] Abdus Salam Int Ctr Theoret Phys, ICTP, I-34010 Trieste - Italy
Total Affiliations: 3
Document type: Journal article
Source: Physical Review D; v. 90, n. 1 JUL 14 2014.
Web of Science Citations: 2

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-GeVand 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 Delta m(32)(2) = 2.45 x 10(-3) eV(2), sin(2)(theta(23)) = 0.42 and MaVaN parameter alpha(32) = 0.28 with modest improvement, Delta chi(2) = 1.8, over the standard oscillation scenario. The combination of MINOS data and Super-Kamiokande data prefers small values of MaVaN parameter alpha(32) < 0.31 at 90% C. L. (AU)

FAPESP's process: 12/16389-1 - Neutrino phenomenology
Grantee:Orlando Luis Goulart Peres
Support type: Regular Research Grants