Leptonic CP Violation Induced by Approximately mu-tau Symmetric Seesaw Mechanism

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dc.creatorBaba, Teppei
dc.creatorYasue, Masaki
dc.date2007-10-15
dc.date2008-04-13
dc.date.accessioned2026-07-07T11:38:06Z
dc.date.available2026-07-07T11:38:06Z
dc.descriptionAssuming a minimal seesaw model with two heavy neutrinos (N), we examine effects of leptonic CP violation induced by approximate mu-tau symmetric interactions. As long as N is subject to the mu-tau symmetry, we can choose CP phases of Dirac mass terms without loss of generality in such a way that these phases arise from mu-tau symmetry breaking interactions. In the case that no phase is present in heavy neutrino mass terms, leptonic CP phases are controlled by two phases alpha and beta. The similar consideration is extended to N blind to the mu-tau symmetry. It is argued that N subject (blind) to the mu-tau symmetry necessarily describes the normal (inverted) mass hierarchy. We restrict ourselves to mu-tau symmetric textures giving the tri-bimaximal mixing and calculate flavor neutrino masses to estimate CP-violating Dirac and Majorana phases as well as neutrino mixing angles as functions of alpha and beta. Since alpha and beta are generated by mu-tau symmetry breaking interactions, CP-violating Majorana phase tends to be suppressed and is found to be at most O(0.1) radian. On the other hand, CP-violating Dirac phase tends to show a proportionality to alpha or to beta.
dc.description28 pages including 14 figures, several typos corrected, version to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0710.2713
dc.identifierhttp://arxiv.org/abs/0710.2713
dc.identifierPhys.Rev.D77:075008,2008
dc.identifierdoi:10.1103/PhysRevD.77.075008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199440
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLeptonic CP Violation Induced by Approximately mu-tau Symmetric Seesaw Mechanism
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