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Experimental study of decoherence effect at Daya Bay

Wong, Chan-Fai (Steven) (SYSU, Guangzhou) ; Chu, M.C. (Hong Kong, Chinese U.) ; Dolgareva, M. (Dubna, JINR) ; Gonchar, M. (Dubna, JINR) ; Naumov, D. (Dubna, JINR) ; Taichenachev, D. (Dubna, JINR) ; Treskov, K. (Dubna, JINR) ; Tsui, K.M. (Tokyo U., ICRR) ; Wang, W. (SYSU, Guangzhou)

Published in: J.Phys.Conf.Ser.
Year: 2017
Vol.: 888    Num./Issue: 1
Page No: 012253
Pages: 3
Year: published

Abstract: The last unknown neutrino mixing angle has been successfully measured by the Daya Bay, RENO and Double Chooz experiments. The used oscillation probability formula is based on the plane-wave model. A wave-packet model is necessary for a self-consistent description of neutrino oscillations. The oscillation probability formula in the wave-packet model describes effects missing in the plane-wave approximation, such as delocalization, decoherence and dispersion which all depend on a single unknown parameter σ(p) – momentum dispersion of the neutrino wave-packet. The survival probability formula in the wave-packet model was used to fit the Daya Bay data. The high-statistics data set of reactor ${\bar{\nu }}_{e}$ interactions in the Daya Bay experiment allows us to study the neutrino oscillation in the wave-packet model and provide the first experimental constraint of σ(p) . Some results of our study are reported in this paper.

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DOI: 10.1088/1742-6596/888/1/012253