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Title: Study of the wave packet treatment of neutrino oscillation at Daya Bay

The disappearance of reactor $$\bar{\nu}_e$$ observed by the Daya Bay experiment is examined in the framework of a model in which the neutrino is described by a wave packet with a relative intrinsic momentum dispersion $$\sigma_\text{rel}$$. Three pairs of nuclear reactors and eight antineutrino detectors, each with good energy resolution, distributed among three experimental halls, supply a high-statistics sample of $$\bar{\nu}_e$$ acquired at nine different baselines. This provides a unique platform to test the effects which arise from the wave packet treatment of neutrino oscillation. The modified survival probability formula was used to fit Daya Bay data, providing the first experimental limits: $$2.38 \cdot 10^{-17} < \sigma_{\rm rel} < 0.23$$. Treating the dimensions of the reactor cores and detectors as constraints, the limits are improved: $$10^{-14} \lesssim \sigma_{\rm rel} < 0.23$$, and an upper limit of $$\sigma_{\rm rel} <0.20$$ is obtained. All limits correspond to a 95\% C.L. Furthermore, the effect due to the wave packet nature of neutrino oscillation is found to be insignificant for reactor antineutrinos detected by the Daya Bay experiment thus ensuring an unbiased measurement of the oscillation parameters $$\sin^22\theta_{13}$$ and $$\Delta m^2_{32}$$ within the plane wave model.
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Publication Date:
Report Number(s):
BNL-114473-2017-JA
Journal ID: ISSN 1434-6044; ark:/13030/qt6hm7b1fw; TRN: US1702945
Grant/Contract Number:
AC02-05CH11231; SC0012704
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 9; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
Daya Bay Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; wave packet; neutrino oscillation; neutrino mixing; decoherence in neutrino oscillation; reactor; Daya Bay
OSTI Identifier:
1408467
Alternate Identifier(s):
OSTI ID: 1408719