Mass hierarchy determination for θ13 = 0 and atmospheric neutrinos

Gandhi, Raj ; Ghoshal, Pomita ; Goswami, Srubabati ; Uma Sankar, S. (2010) Mass hierarchy determination for θ13 = 0 and atmospheric neutrinos Modern Physics Letters A, 25 (26). pp. 2255-2266. ISSN 0217-7323

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We examine the possibility of determining the neutrino mass hierarchy in the limit θ13=0 using atmospheric neutrinos as the source. In this limit, in which θ13 driven matter effects are absent, independent measurements of Δ31 and Δ32 can, in principle, lead to hierarchy determination. Since the difference between these two is Δ21, one needs an experimental arrangement where Δ21 L/E ≳1 can be achieved. This condition can be satisfied by atmospheric neutrinos since they have a large range of energies and baselines. In spite of this, we find that hierarchy determination in the θ13 = 0 limit with atmospheric neutrinos is not a realistic possibility, even in conjunction with an apparently synergistic beam experiment like T2K or NOνA. We discuss the reasons for this, and also in the process clarify the conditions that must be satisfied in general for hierarchy determination if θ13 = 0.

Item Type:Article
Source:Copyright of this article belongs to World Scientific Publishing Co Pte Ltd.
Keywords:Atmospheric Neutrinos; Mass Hierarchy; Determination
ID Code:108754
Deposited On:01 Feb 2018 04:46
Last Modified:01 Feb 2018 04:46

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