Search for a time-varying electron antineutrino signal at Daya Bay

Abstract

A search for a time-varyingν e signal was performed with 621 days of data acquired by the Daya Bay Reactor Neutrino Experiment over 704 calendar days. The time spectrum of the measuredν e flux normalized to its prediction was analyzed with a Lomb-Scargle periodogram, which yielded no significant signal for periods ranging from 2 hours to nearly 2 years. The normalized time spectrum was also fit for a sidereal modulation under the Standard Model Extension (SME) framework to search for Lorentz and CPT violation (LV-CPTV). Limits were obtained for all six flavor pairsēμ;ēτ,μτ,ēē;μμ andττ by fitting them one at a time, constituting the first experimental constraints on the latter three. Daya Bay's high statistics and unique layout of multiple directions from three pairs of reactors to three experimental halls allowed the simultaneous constraint of individual SME LV-CPTV coefficients without assuming others contribute negligibly, a first for a neutrino experiment.

Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review

“…Search continues to other accelerator experiments such as T2K [1479]. On the other hand, reactor neutrinos are sensitive to channels including electron anti-neutrinos and Double Chooz [1480,1481] and Daya Bay [1482] searched for LIV. At the higher energy end, conventional atmospheric neutrinos can reach up to ∼ 20 TeV and they are attractive source to test LIV.…”

Signatures of ultralight dark matter in neutrino oscillation experiments

“…Such studies have already been performed by e.g. SNO, Super-Kamiokande, and Daya Bay collaborations [41][42][43]47]. In the next section, we will provide a detailed time-dependent analysis of mock experimental data (we use the DUNE set up as an example), employing the Lomb-Scargle method, to estimate sensitivity to ultralight scalars.…”

“…Such searches are not new in the context of neutrino physics. For instance, many analyses of periodicities in the solar neutrino flux have been performed in SNO [42,55] and SuperKamiokande [56], as well as for other time-varying signals in the context of Lorentz and CPT violation in Daya Bay [47].…”

Astrophysical Neutrinos in Testing Lorentz Symmetry

“…These are performed in reactor [99][100][101][102], accelerator short- [103][104][105][106][107][108][109][110][111][112][113] and long-baseline [107,[114][115][116][117] experiments via energy and directional spectra of atmospheric neutrino oscillations [115,116,[118][119][120][121][122], solar neutrino investigations [123][124][125], beta decays [126][127][128][129][130][131][132][133][134][135][136], and kinematics [21,24,91,[137][138][139][140][141]…”

“…The probability for ν-ν of Equation ( 40) is linear in H 1 ab , and Equation (43) shows that the dependence on the momentum is up to quadratic, so the sidereal frequency dependence appears up to the second harmonic 2ω ⊕ . This type of expression is the typical starting point of numerous experiments looking for sidereal variations resulting in detailed bounds for the a and c coefficients [99][100][101][102][103][104][105][106][107][107][108][109][110][113][114][115][116][117][118][119].…”