Parameter Limits for Neutrino Oscillation with Decoherence in KamLAND

TL;DR

This paper sets new limits on neutrino decoherence parameters using KamLAND data within a quantum open systems framework, exploring energy dependence and providing constraints on decoherence effects in neutrino oscillations.

Contribution

It introduces updated bounds on the neutrino decoherence parameter considering energy dependence, based on KamLAND data within a three-family oscillation model.

Findings

New limits for the decoherence parameter γ at different energy dependence exponents.

Constraints on γ are 3.7×10^{-24} GeV for n=-1, 6.8×10^{-22} GeV for n=0, and 1.5×10^{-19} GeV for n=1.

The analysis enhances understanding of decoherence effects in neutrino oscillations.

Abstract

In the framework of quantum open systems we analyze data from KamLAND by using a model that considers neutrino oscillation in a three-family approximation with the inclusion of the decoherence effect. Using a $\chi^2$ test we find new limits for the decoherence parameter which we call $\gamma$, considering the most recent data by KamLAND. Assuming an energy dependence of the type $ \gamma = \gamma_0 \left( E/E_0 \right) ^n$, in 95 \% C.L. the limits found are $3.7 \times 10^{-24} GeV$ for $ n=-1$, $6.8 \times 10^{-22} GeV$ for $ n=0$, and $1.5 \times 10^{-19} GeV$ for $ n=1 $ on the energy dependence.