Resolving the atmospheric octant by an improved measurement of the reactor angle

Chatterjee, Sabya Sachi; Pasquini, Pedro; Valle, J. W. F.

doi:10.1103/physrevd.96.011303

Cited by 12 publications

(10 citation statements)

References 38 publications

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“…[120] and recently in Ref. [121], an improved measurement of the reactor angle helps resolving the atmospheric octant. From the figures, we see that the analysis of long baseline accelerator data only (indicated by black lines) shows a preference for values of θ 23 close to maximal mixing for the two mass orderings, with the best fit points indicated by a down-triangle.…”

Section: The θ 23 Octant Problemmentioning

confidence: 93%

Neutrino oscillation phenomenology in the standard model and beyond

Ternes

2020

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Section: The θ 23 Octant Problemmentioning

confidence: 93%

Neutrino oscillation phenomenology in the standard model and beyond

Ternes

2020

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“…[80] and recently in Ref. [81], an improved measurement of the reactor angle helps resolving the atmospheric octant. From the figures, we see that the analysis of long-baseline data only (indicated by black lines) shows a preference for values of θ 23 close to maximal mixing for the two mass orderings, with the best shifted towards smaller values.…”

Section: Neutrino Mass Orderingmentioning

confidence: 99%

Status of neutrino oscillations 2018: 3σ hint for normal mass ordering and improved CP sensitivity

et al. 2018

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We present a new global fit of neutrino oscillation parameters within the simplest three-neutrino picture, including new data which appeared since our previous analysis [1]. In this update we include new long-baseline neutrino data involving the antineutrino channel in T2K, as well as new data in the neutrino channel, data from NOνA, as well as new reactor data, such as the Daya Bay 1230 days electron antineutrino disappearance spectrum data and the 1500 live days prompt spectrum from RENO, as well as new Double Chooz data. We also include atmospheric neutrino data from the IceCube DeepCore and ANTARES neutrino telescopes and from Super-Kamiokande. Finally, we also update our solar oscillation analysis by including the 2055-day day/night spectrum from the fourth phase of the Super-Kamiokande experiment. With the new data we find a preference for the atmospheric angle in the upper octant for both neutrino mass orderings, with maximal mixing allowed at ∆χ 2 = 1.6 (3.2) for normal (inverted) ordering. We also obtain a strong preference for values of the CP phase δ in the range [π, 2π], excluding values close to π/2 at more than 4σ. More remarkably, our global analysis shows for the first time hints in favour of the normal mass ordering over the inverted one at more than 3σ. We discuss in detail the origin of the mass ordering, CP violation and octant sensitivities, analyzing the interplay among the different neutrino data samples. I. INTRODUCTIONThe discovery of neutrino oscillations constitutes a major milestone in astro and particle physics over the last few decades. Solar and atmospheric neutrino studies were the first to give a convincing evidence for neutrino conversion [2,3]. By studying the distortion in the neutrino spectra, laboratory experiments based at reactors and accelerators have played a key role in selecting neutrino oscillations as the conversion mechanism at work. Reactor and accelerator experiments have now brought the field of neutrino oscillations to the precision era, contributing significantly to sharpen the determination of the oscillation parameters [4][5][6][7][8][9]. Particularly relevant was the input of the KamLAND experiment in elucidating the nature of the solution to the solar neutrino puzzle [10,11]. Indeed, KamLAND measurements have ruled out alternative mechanisms involving spin flavor precession [12,13] as well as nonstandard neutrino interaction (NSI) solutions to the solar neutrino problem [14]. Such NSI-only scenarios as well as all other more exotic hypotheses are all ruled out by KamLAND [5,15]. Precision tests of the oscillation picture have already a long history, and remain as timely as ever. Indeed, one can probe neutrino NSI with atmospheric [16] as well as solar neutrino data [17, 18], where the robustness of the * https://globalfit.astroparticles.es/ † Electronic address: dvanegas@ifi.unicamp.br ‡ Electronic address: mariam@ific.uv.es § Electronic address: valle@ific.uv.es arXiv:1708.01186v2 [hep-ph] 27 Apr 2018 solar neutrino oscillation description has been question...

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“…In summary, two of the oscillation parameters remain poorly measured, namely θ23 and δ. There are good long-term prospects for improving the measurement of these parameters in future experiments, such as DUNE [3][4][5][6], except for the octant discrimination, which will remain poor if the true value happens to be close to maximality [7]. By and large, however, neutrino physics has reached the precision era.…”

Section: Status Of Neutrino Oscillations 2018mentioning

confidence: 99%