Octant sensitivity for large θ 13 in atmospheric and long-baseline neutrino experiments

Chatterjee, A.; Ghoshal, Pomita; Goswami, Sumanta; Raut, Sushant K.

doi:10.1007/jhep06(2013)010

Cited by 50 publications

(56 citation statements)

References 94 publications

(131 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These experiments can also resolve the octant of θ 23 at 2σ C.L. 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.

Self Cite

View full text Add to dashboard Cite

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 .

show abstract

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.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The combined data from the current ν e appearance experiments, T2K [23,24] and NOνA [25][26][27], can provide a hint at 90% confidence level for neutrino mass ordering [28,29] and at 95% confidence level for octant of θ 23 [30,31]. They can determine these quantities at > 99% C.L.…”

Section: Introductionmentioning

confidence: 99%

Exploring the three flavor effects with future superbeams using liquid argon detectors

Agarwalla

Prakash

Sankar

2014

J. High Energ. Phys.

View full text Add to dashboard Cite

Recent measurement of a moderately large value of θ 13 signifies an important breakthrough in establishing the standard three flavor oscillation picture of neutrinos. It has provided an opportunity to explore the sub-dominant three flavor effects in present and future long-baseline experiments. In this paper, we perform a comparative study of the physics reach of two future superbeam facilities, LBNE and LBNO in their first phases of run, to resolve the issues of neutrino mass hierarchy, octant of θ 23 , and leptonic CP violation. We also find that the sensitivity of these future facilities can be improved significantly by adding the projected data from T2K and NOνA. Stand-alone LBNO setup with a 10 kt detector has a mass hierarchy discovery reach of more than 7σ, for the lowest allowed value of sin 2 θ 23 (true) = 0.34. This result is valid for any choice of true δ CP and hierarchy. LBNE10, in combination with T2K and NOνA, can achieve 3σ hierarchy discrimination for any choice of δ CP , sin 2 θ 23 , and hierarchy. The same combination can provide a 3σ octant resolution for sin 2 θ 23 (true) ≤ 0.44 or for sin 2 θ 23 (true) ≥ 0.58 for all values of δ CP (true). LBNO can give similar results with 10 kt detector mass. In their first phases, both LBNE10 and LBNO with 20 kt detector can establish leptonic CP violation for around 50% values of true δ CP at 2σ confidence level. In case of LBNE10, CP coverage at 3σ can be enhanced from 3% to 43% by combining T2K and NOνA data, assuming sin 2 θ 23 (true) = 0.5. For LBNO setup, CP violation discovery at 3σ is possible for 46% values of true δ CP if we add the data from T2K and NOνA.

show abstract

“…Clues toward formulating the general θ 23 −θ 13 −δ degeneracy have been given by many authors but within various approximations. For example, a formal degeneracy equation has been written down by Donini et al [23] under the θ 23 ↔ π/2 − θ 23 approximation, and by Chatterjee et al [24] under restriction to a part of the three-dimensional manifold. However, the full analytical structure of these degeneracies has not been revealed in a manner which is as general as that presented in this paper, nor have they ever been analyzed, imposing a clear discrimination between the degeneracies of the appearance and disappearance channels.…”

Section: General θ 23 − θ 13 − δ Degeneracy Of the Appearance Andmentioning

confidence: 99%

“…The analyses from early to recent times include, for example, Refs. [12,24,27,[50][51][52][53][54][55][56][57].…”

Section: Appearance and Disappearance Measurements Of θ 23mentioning

confidence: 99%

Interplay between appearance and disappearance channels for precision measurements ofθ23andδ

2014

View full text Add to dashboard Cite

We discuss how the CP violating phase δ and the mixing angle θ 23 can be measured precisely in an environment where there are strong correlations between them. This is achieved by paying special attention to the mutual roles and the interplay between the appearance and the disappearance channels in long-baseline neutrino oscillation experiments. We analyze and clarify the general structure of the θ 23 − θ 13 − δ degeneracy for both the appearance and disappearance channels in a more complete fashion than what has previously been discussed in the literature. A full understanding of this degeneracy is of vital importance if θ 23 is close to maximal mixing. The relative importance between the appearance and disappearance channels depends upon the particular setup and how close to maximal mixing Nature has chosen the value for θ 23 . For facilities that operate with a narrow band beam or a wide band beam centered on the first oscillation extremum, the contribution of the disappearance channel depends critically on the systematic uncertainties assumed for this channel. Whereas for facilities that operate at energies above the first oscillation extremum or at the second oscillation extremum the appearance channels dominate. On the other hand, for δ we find that the disappearance channel usually improves the sensitivity, modestly for facilities around the first oscillation extremum and more significantly for facilities operating at an energy above the first oscillation extremum, especially near δ ∼ ±π/2.

show abstract

Octant sensitivity for large θ 13 in atmospheric and long-baseline neutrino experiments

Cited by 50 publications

References 94 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 ¯ $$ \left(\overline{\nu}\right) $$

Exploring the three flavor effects with future superbeams using liquid argon detectors

Interplay between appearance and disappearance channels for precision measurements ofθ23andδ

Contact Info

Product

Resources

About