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Type: Artigo de periódico
Title: Exploring neutrino mixing with low energy superbeams
Author: Minakata, H
Nunokawa, H
Abstract: We explore the features of neutrino oscillation which are relevant for measurements of the leptonic CP violating phase delta and the sign of Deltam(13)(2) in experiments with low-energy conventional superbeams. Toward the goal, we introduce a new powerful tool called the "CP trajectory diagram in bi-probability space" which allows us to represent pictorially the three effects, the effects of (a) genuine CP violation due to the sin delta term, (b) CP conserving cos delta term, and (c) fake CP violation due to earth matter, separately in a single diagram. By using the diagram, we observe that there is a two-fold ambiguity in the determination of delta which is related with the sign of Deltam(13)(2). Possible ways of resolving the ambiguity are discussed. In particular, we point out that an in situ simultaneous measurement of delta and the sign of Deltam(13)(2) can be carried out at distances of about 700 km, or at the Phase II of the JHF experiment provided that sin delta.Deltam(13)(2) < 0, both with a megaton class water Cherenkov detector.
Subject: solar and atmospheric neutrinos
neutrino physics
CP violation
Country: EUA
Editor: Springer
Citation: Journal Of High Energy Physics. Springer, n. 10, 2001.
Rights: aberto
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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