Long-Baseline Neutrino Oscillation Experiments

Feldman, G. J.; Hartnell, J.; Kobayashi, T.

doi:10.1155/2013/475749

Cited by 46 publications

(51 citation statements)

References 80 publications

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“…provided sin 2 θ 23 ≤ 0.44 or ≥ 0.57 [30,31]. Hence, future facilities consisting of intense high-power beams and large smart detectors are inevitable to resolve these fundamental unknowns at high confidence level [32].…”

Section: Jhep05(2017)115mentioning

confidence: 99%

A hybrid setup for fundamental unknowns in neutrino oscillations using T2HK (ν) and μ-DAR ν ¯ $$ \left(\overline{\nu}\right) $$

Agarwalla¹,

Ghosh²,

Raut³

2017

J. High Energ. Phys.

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Neutrino mass hierarchy, CP-violation, and octant of θ 23 are the fundamental unknowns in neutrino oscillations. In order to address all these three unknowns, we study the physics reach of a setup, where we replace the antineutrino run of T2HK with antineutrinos from muon decay at rest (µ-DAR). This approach has the advantages of having higher statistics in both neutrino and antineutrino modes, and lower beam-on backgrounds for antineutrino run with reduced systematics. We find that a hybrid setup consisting of T2HK (ν) and µ-DAR (ν) in conjunction with full exposure from T2K and NOνA can resolve the issue of mass hierarchy at greater than 3σ C.L. irrespective of the choices of hierarchy, δ CP , and θ 23 . This hybrid setup can also establish the CP-violation at 5σ C.L. for ∼ 55% choices of δ CP , whereas the same for conventional T2HK (ν +ν) setup along with T2K and NOνA is around 30%. As far as the octant of θ 23 is concerned, this hybrid setup can exclude the wrong octant at 5σ C.L. if θ 23 is at least 3 • away from maximal mixing for any δ CP .

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Section: Jhep05(2017)115mentioning

confidence: 99%

A hybrid setup for fundamental unknowns in neutrino oscillations using T2HK (ν) and μ-DAR ν ¯ $$ \left(\overline{\nu}\right) $$

Agarwalla¹,

Ghosh²,

Raut³

2017

J. High Energ. Phys.

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“…The neutrino sector is still poorly understood and the mechanism that gives rise to their mass is unknown. There are thought to be three active neutrino species, with mass differences measured through solar, atmospheric, reactor, and accelerator neutrino oscillation experiments (for reviews see, e.g., Gonzalez-Garcia and Nir [1], Maltoni et al [2], Smirnov [3], and Feldman et al [4]). The results imply a minimum total mass of 60 meV in a normal hierarchy with two lighter neutrinos and one heavier neutrino, or 100 meV in an inverted hierarchy with two massive neutrinos.…”

Section: Introductionmentioning

confidence: 99%

“…Given the known mass splittings from oscillation experiments, this is an excellent approximation to the normal hierarchy in the minimal-mass scenario [4]. For comparison, we compute the constraint on the neutrino mass sum in the inverted hierarchy, with two degenerate massive neutrinos and one massless neutrino, with a neutrino mass sum of Σm ν ¼ 120 meV.…”

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confidence: 99%

Towards a cosmological neutrino mass detection

et al. 2015

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Future cosmological measurements should enable the sum of neutrino masses to be determined indirectly through their effects on the expansion rate of the Universe and the clustering of matter. We consider prospects for the gravitationally lensed cosmic microwave background (CMB) anisotropies and baryon acoustic oscillations (BAOs) in the galaxy distribution, examining how the projected uncertainty of ≈15 meV on the neutrino mass sum (a 4σ detection of the minimal mass) might be reached over the next decade. The current 1σ uncertainty of ≈103 meV (Planck-2015 þ BAO-15) will be improved by upcoming "Stage-3" (S3) CMB experiments (S3 þ BAO-15∶ 44 meV), then upcoming BAO measurements (S3 þ DESI∶ 22 meV), and planned next-generation "Stage 4" (S4) CMB experiments (S4 þ DESI∶ 15-19 meV, depending on angular range). An improved optical depth measurement is important: the projected neutrino mass uncertainty increases to 26 meV if S4 is limited to l > 20 and combined with current large-scale polarization data. Looking beyond ΛCDM, including curvature uncertainty increases the forecast mass error by ≈50% for S4 þ DESI, and more than doubles the error with a two-parameter dark-energy equation of state. Complementary low-redshift probes including galaxy lensing will play a role in distinguishing between massive neutrinos and a departure from a w ¼ −1, flat geometry.

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“…Two fundamental elements are still missing in this picture: the mass hierarchy 1 (MH) and the CP-phase δ, which, if = (0, π), gives rise to leptonic CP-violation (CPV). A rich experimental program is underway to identify these two unknown properties, and to refine the estimates of the known mass-mixing parameters [1][2][3][4][5].…”

mentioning

confidence: 99%

Octant of θ23 in Danger with a Light Sterile Neutrino

2017

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Present global fits of world neutrino data hint towards non-maximal θ23 with two nearly degenerate solutions, one in the lower octant (θ23 < π/4), and the other in the higher octant (θ23 > π/4). This octant ambiguity of θ23 is one of the fundamental issues in the neutrino sector, and its resolution is a crucial goal of next-generation long-baseline (LBL) experiments. In this letter, we address for the first time, the impact of a light eV-scale sterile neutrino towards such a measurement, taking the Deep Underground Neutrino Experiment (DUNE) as a case study. In the so-called 3+1 scheme involving three active and one sterile neutrinos, the νµ → νe transition probability probed in the LBL experiments acquires a new interference term via active-sterile oscillations. We find that this interference term can mimic a swap of the θ23 octant, even if one uses the information from both neutrino and antineutrino channels. As a consequence, the sensitivity to the octant of θ23 can be completely lost, and this may have serious implications for our understanding of neutrinos from both the experimental and theoretical perspectives.

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Long-Baseline Neutrino Oscillation Experiments

Cited by 46 publications

References 80 publications

A hybrid setup for fundamental unknowns in neutrino oscillations using T2HK (ν) and μ-DAR ν ¯ $$ \left(\overline{\nu}\right) $$

A hybrid setup for fundamental unknowns in neutrino oscillations using T2HK (ν) and μ-DAR ν ¯ $$ \left(\overline{\nu}\right) $$

Towards a cosmological neutrino mass detection

Octant of θ23 in Danger with a Light Sterile Neutrino

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