Probing Non-unitary $CP$ Violation effects in Neutrino Oscillation Experiments

Verma, Surender; Bhardwaj, Shankita

doi:10.48550/arxiv.1609.06412

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bounds on non-unitary mixing parameters are obtained in [34,35]. Moreover, the imapct of non-unitarity mixing on the determination of various unknowns in neutrino sector such as neutrino mass hierarchy, octant of atmospheric mixing angle, and CP violating phase by long-baseline experiments are discussed in [36][37][38][39]. A combined analysis of short and long-baseline neutrino oscillation data in non-unitary mixing scenario has been explored in [40] and it is found that there is no significant deviation from unitary mixing.…”

Section: Introductionmentioning

confidence: 98%

Probing non-unitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC

Soumya

2021

Preprint

View full text Add to dashboard Cite

This paper investigates the capability of long-baseline experiments, which are making use of neutrinos that are coming from Japan Proton Accelerator Research Complex (J-PARC), in establishing the unitarity of active-neutrino mixing by ruling out the non-unitary mixing scheme as a function of true values of CP-violating phase δ CP . It is found that T2HK can establish unitarity of active neutrino mixing at above 2σ C.L. irrespective of neutrino mass hierarchy and true value of δ CP , if non-unitary (NU) parameter α 21 is of the order of 10 −2 . Further, this paper is also discuss the bound on NU parameter in 21 sector and sensitivity limit of these experiments in determining NU parameter. It is found that the bounds on (α 21 /2) are 0.028, 0.0026, 0.005 at 2σ C.L. respectively for T2K, T2HK, and T2HKK. Moreover, it is also found that the sensitivity limit of T2HK on NU parameter is far better than that of both T2HKK and T2K.

show abstract

Section: Introductionmentioning

confidence: 98%

Probing non-unitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC

Soumya

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Furthermore, there are studies which are dedicated to constraining the non-unitarity parameters [42,43]. Some of the recent studies which have discussed the consequences of the non-unitarity effect on the determination of neutrino mass hierarchy, octant of atmospheric mixing angle, and CPviolating phase by long-baseline experiments can be found in [44][45][46][47]. In this paper, we focus on the low energy scale inverse seesaw model which permits significantly large mixing between the active and sterile neutrinos and gives rise to non-unitary lepton mixing.…”

Section: Introductionmentioning

confidence: 99%

Non-unitary lepton mixing in an inverse seesaw and its impact on the physics potential of long-baseline experiments

Soumya

Mohanta

2018

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

In this paper, we consider the low energy scale inverse seesaw mechanism in which the observed neutrino mass and lepton mixing are explained by introducing right-handed neutrinos and the gauge-singlet fermions with experimentally testable energy scale. Moreover, the presence of such new fermions leads to unitarity violation in lepton mixing due to significantly large mixing between active neutrinos and the heavy fermions. In addition to this, such large lepton mixing also gives rise to potentially large lepton flavor violation, which allows one to constrain the non-unitarity parameters via lepton flavor violating decays (l i → l j γ). We make use of these constraints on non-unitarity parameters and investigate their effects on the determination of current unknown oscillation parameters at long-baseline experiments. We find that non-unitarity parameters are sensitive to the NOνA experiment. However, it is observed that the NOνA experiment is not expected to improve the current knowledge of non-unitarity parameter η 21 . We also find that the sensitivities to current unknowns are deteriorated significantly in the presence of non-unitary lepton mixing and these sensitivities crucially depend upon the new CP-violating phase in the non-unitary mixing. Further, we find that the degeneracy resolution capability of the NOνA experiment is reduced in the presence of non-unitarity parameters. However, the synergy between the currently running experiments T2K and NOνA can improve the parameter degeneracy resolution and hence there is enhancement in the sensitivities of unknowns.

show abstract

Probing Non-unitary $CP$ Violation effects in Neutrino Oscillation Experiments

Cited by 2 publications

References 0 publications

Probing non-unitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC

Probing non-unitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC

Non-unitary lepton mixing in an inverse seesaw and its impact on the physics potential of long-baseline experiments

Contact Info

Product

Resources

About