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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Gratieri, D. R. [1, 2] ; Peres, O. L. G. [2, 3]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Fed Pelotas, Inst Fisica Math, BR-96010 Pelotas, Rio Grande Sul - Brazil
[2] Inst Fis Gleb Wataghin, UNICAMP, BR-13083859 Campinas, SP - Brazil
[3] Abdus Salam Int Ctr Theoret Phys, ICTP, I-34010 Trieste - Italy
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review D; v. 90, n. 1 JUL 14 2014.
Citações Web of Science: 2
Resumo

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)

Processo FAPESP: 12/16389-1 - Fenomenologia de neutrinos
Beneficiário:Orlando Luis Goulart Peres
Linha de fomento: Auxílio à Pesquisa - Regular