Decoerência quântica em neutrinos de aceleradores
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2019-03-18
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Universidade Federal de Goiás
Resumo
In this thesis we investigate the three flavor neutrino oscillation in vacuum considering the
open quantum system framework. This allow us to introduce the quantum decoherence effects
in the temporal evolution dynamics of neutrinos eigenstates. The characterization of this effect
is given by Г12, Г13 and Г23 parameters, which are associated with the decoherence effects in
which there is no neutrino energy dissipation, and the Г33 and Г88, which correspond to
possible dissipative effects. We propose some possible scenarios to investigate the effects of
decoherence on neutrino systems. In each of these scenarios we assume only one parameter
of decoherence Г. In our analysis we consider a phenomenology for the parameter of
decoherence, which Γ has a neutrino energy (E) dependence, by a law-power given by n and
by a constant γ0, which is the decoherence parameter without energy dependence. This is the
parameterization most used in studies that include quantum decoherence in neutrinos, in
which where we consider to this analysis, n=-2, 0, 2.
This formalism was applied to the data of the disappearance analysis of MINOS FHC and in the
neutrino run and anti-neutrino run configurations of both disappearance and appearence analysis
of T2K. We had as aim obtain new possibles limits to the quantum decoherence with the
analyzed data to the different proposed scenarios. We have showed that for n=-2 and n=0 we
obtained limits in the order of O(1E−23) GeV and for n=2, in the order of O(1E−25) GeV at
level of 90% C.L. - Confidence Level. In particular for n=-2, we obtained a limit three orders of
magnitude more constrained than the previous analysis (P. Coloma, J. Lopez-Pavon, I.
Martinez-Soler and H. Nunokawa, Decoherence in Neutrino Propagation Through Matter, and
Bounds from IceCube/DeepCore , Eur. Phys. J. C78 (2018) 614), where we obtained that
γ0⩽1,69E-23 GeV at level of 90%C.L.. Through the investigated scenarios in this thesis we also
were able to analyze the decoherence effect in the solar oscillation parameter (Г12 ≠ 0), of
possibles dissipative effects (Г33 = Г88 ≠ 0) and the possibility of the oscillation phase be
complex and it possibles consequences in the usual neutrino oscillation.
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Citação
GOMES, Abner Leonel Gadelha. Decoerência quântica em neutrinos de aceleradores. 2019. 207 f. Tese (Doutorado em Fisica) - Universidade Federal de Goiás, Goiânia, 2019.