Abstract
AbstractIn this article we consider the presence of neutrino non-standard interactions (NSI) in the production and detection processes of reactor antineutrinos at the Daya Bay experiment. We report for the first time, the new constraints on the flavor non-universal and flavor universal charged-current NSI parameters, estimated using the currently released 621 days of Daya Bay data. New limits are placed assuming that the new physics effects are just inverse of each other in the production and detection processes. With this special choice of the NSI parameters, we observe a shift in the oscillation amplitude without distorting the L/E pattern of the oscillation probability. This shift in the depth of the oscillation dip can be caused by the NSI parameters as well as by θ13, making it quite difficult to disentangle the NSI effects from the standard oscillations. We explore the correlations between the NSI parameters and θ13 that may lead to significant deviations in the reported value of the reactor mixing angle with the help of iso-probability surface plots. Finally, we present the limits on electron, muon/tau, and flavor universal (FU) NSI couplings with and without considering the uncertainty in the normalization of the total event rates. Assuming a perfect knowledge of the event rates normalization, we find strong upper bounds ∼ 0.1% for the electron and FU cases improving the present limits by one order of magnitude. However, for a conservative error of 5% in the total normalization, these constraints are relaxed by almost one order of magnitude.
Highlights
Precision of 6% on sin2 2θ13 which is already better than the precision achieved on sin2 θ23
The success of the currently running Daya Bay, RENO, and Double Chooz reactor antineutrino experiments in measuring the smallest lepton mixing angle θ13 with impressive accuracy signifies an important advancement in the field of modern neutrino physics with nonzero mass and three-flavor mixing
In this paper for the first time, we have reported the new constraints on the flavor nonuniversal and flavor universal non-standard interactions (NSI) parameters obtained using the currently released 621 days of Daya Bay data
Summary
According to the usual procedure followed in the non-standard analyses of reactor data [47, 63], we start by re-defining the neutrino flavour states in the presence of NSI in the source and detection processes. [68], all the normalization terms coming from Nαs and Nβd will cancel while convoluting the neutrino oscillation probabilities, cross sections, and neutrino fluxes to estimate the number of events in a given experiment such as Daya Bay. In this case, as shown in ref. [68], all the normalization terms coming from Nαs and Nβd will cancel while convoluting the neutrino oscillation probabilities, cross sections, and neutrino fluxes to estimate the number of events in a given experiment such as Daya Bay This is due to the fact that the SM cross sections and neutrino fluxes used in our simulation have been theoretically derived assuming an orthonormal neutrino basis and they need to be corrected. Note that when we will discuss the features of the probability prior to the simulation of a particular experiment, we will always refer to the effective probability, that might be greater than one
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