A study of invisible neutrino decay at DUNE and its effects on θ23 measurement

Choubey, Sandhya ; Goswami, Srubabati ; Pramanik, Dipyaman (2018) A study of invisible neutrino decay at DUNE and its effects on θ23 measurement Journal of High Energy Physics, 2018 (2). ISSN 1029-8479

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Official URL: http://doi.org/10.1007/JHEP02(2018)055

Related URL: http://dx.doi.org/10.1007/JHEP02(2018)055


We study the consequences of invisible decay of neutrinos in the context of the DUNE experiment. We assume that the third mass eigenstate is unstable and decays to a light sterile neutrino and a scalar or a pseudo-scalar. We consider DUNE running in 5 years neutrino and 5 years antineutrino mode and a detector volume of 40 kt. We obtain the bounds on the rest frame life time τ3 normalized to the mass m3 as τ3/m3>4.50×10-11 s/eV at 90\% C.L. for a normal hierarchical mass spectrum. We also find that DUNE can discover neutrino decay for τ3/m3>4.27×10-11 s/eV at 90\% C.L. In addition, for an unstable ν3 with an illustrative value of τ3/m3 = 1.2×10-11 s/eV, the no decay case gets disfavoured at the 3σ C.L. At 90\% C.L. the allowed range for this true value is obtained as 1.71×10-113/m3>9.29×10-12in units of s/eV. We also study the correlation between a non-zero τ3/m3 and standard oscillation parameters and find an interesting correlation in the appearance channel probability with the mixing angle θ23. This alters the octant sensitvity of DUNE, favorably (unfavorably) for true θ23 in the lower (higher) octant. The effect of a decaying neutrino does not alter the hierarchy or CP discovery sensitivity of DUNE in a discernible way.

Item Type:Article
Source:Copyright of this article belongs to Springer Nature.
Keywords:Lifetime; Neutrino Detectors And Telescopes (Experiments); Oscillation.
ID Code:118040
Deposited On:11 May 2021 12:53
Last Modified:11 May 2021 12:53

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