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Predicting neutrino oscillations with “bi-large” lepton mixing matrices
http://repo.scoap3.org/record/32234
We propose two schemes for the lepton mixing matrix U=Ul†Uν , where U=Ul refers to the charged sector, and Uν denotes the neutrino diagonalization matrix. We assume Uν to be CP conserving and its three angles to be connected with the Cabibbo angle in a simple manner. CP violation arises solely from the Ul , assumed to have the CKM form, Ul≃VCKM , suggested by unification. Oscillation parameters depend on a single parameter, leading to narrow ranges for the “solar” and “accelerator” angles θ12 and θ23 , as well as for the CP phase, predicted as δCP∼±1.3π .Chen, PengThu, 11 Apr 2019 17:19:51 GMThttp://repo.scoap3.org/record/32234urn:ISSN:0370-2693Elsevier2019-05-10CP symmetries as guiding posts: revamping tri-bi-maximal mixing. Part I
http://repo.scoap3.org/record/31444
We analyze the possible generalized CP symmetries admitted by the Tri-Bi-Maximal (TBM) neutrino mixing. Taking advantage of these symmetries we construct in a systematic way other variants of the standard TBM Ansatz. Depending on the type and number of generalized CP symmetries imposed, we get new mixing matrices, all of which related to the original TBM matrix. One of such “revamped” TBM variants is the recently discussed mixing matrix of arXiv:1806.03367 . We also briefly discuss the phenomenological implications following from these mixing patterns.Chen, PengThu, 07 Mar 2019 14:09:38 GMThttp://repo.scoap3.org/record/31444urn:ISSN:1029-8479Springer/SISSA2019-03-06Realistic tribimaximal neutrino mixing
http://repo.scoap3.org/record/28021
We propose a generalized version of the tribimaximal (TBM) ansatz for lepton mixing, leading to a nonzero reactor angle θ13 and CP violation. The latter is characterized by two CP phases. The Dirac phase, affecting neutrino oscillations, is nearly maximal (δCP∼±π/2), while the Majorana phase implies narrow allowed ranges for the neutrinoless double beta decay amplitude. The solar angle θ12 lies nearly at its TBM value, while the atmospheric angle θ23 has the TBM value for a maximal δCP. Neutrino oscillation predictions can be tested in present and upcoming experiments.Chen, PengFri, 14 Sep 2018 16:16:03 GMThttp://repo.scoap3.org/record/28021urn:ISSN:2470-0029APS2018-09-14Neutrino predictions from generalized CP symmetries of charged leptons
http://repo.scoap3.org/record/26771
We study the implications of generalized CP transformations acting on the mass matrices of charged leptons in a model-independent way. Generalized e − μ , e − τ and μ −τ symmetries are considered in detail. In all cases the physical parameters of the lepton mixing matrix, three mixing angles and three CP phases can be expressed in terms of a restricted set of independent “theory parameters” that characterize a given choice of CP transformation. This leads to implications for neutrino oscillations as well as neutrinoless double beta decay experiments.Chen, PengThu, 12 Jul 2018 18:07:10 GMThttp://repo.scoap3.org/record/26771urn:ISSN:1029-8479Springer/SISSA2018-07-11Leptogenesis and residual CP symmetry
http://repo.scoap3.org/record/15026
We discuss flavour dependent leptogenesis in the framework of lepton flavour models based on discrete flavour and CP symmetries applied to the type-I seesaw model. Working in the flavour basis, we analyse the case of two general residual CP symmetries in the neutrino sector, which corresponds to all possible semi-direct models based on a preserved Z 2 in the neutrino sector, together with a CP symmetry, which constrains the PMNS matrix up to a single free parameter which may be fixed by the reactor angle. We systematically study and classify this case for all possible residual CP symmetries, and show that the R -matrix is tightly constrained up to a single free parameter, with only certain forms being consistent with successful leptogenesis, leading to possible connections between leptogenesis and PMNS parameters. The formalism is completely general in the sense that the two residual CP symmetries could result from any high energy discrete flavour theory which respects any CP symmetry. As a simple example, we apply the formalism to a high energy S 4 flavour symmetry with a generalized CP symmetry, broken to two residual CP symmetries in the neutrino sector, recovering familiar results for PMNS predictions, together with new results for flavour dependent leptogenesis.Chen, PengSun, 03 Apr 2016 08:09:44 GMThttp://repo.scoap3.org/record/15026urn:ISSN:1029-8479Springer/SISSA2016-03-31Warped flavor symmetry predictions for neutrino physics
http://repo.scoap3.org/record/13300
A realistic five-dimensional warped scenario with all standard model fields propagating in the bulk is proposed. Mass hierarchies would in principle be accounted for by judicious choices of the bulk mass parameters, while fermion mixing angles are restricted by a Δ(27) flavor symmetry broken on the branes by flavon fields.The latter gives stringent predictions for the neutrino mixing parameters, and the Dirac CP violation phase, all described in terms of only two independent parameters at leading order. The scheme also gives an adequate CKM fit and should be testable within upcoming oscillation experiments.Chen, PengTue, 05 Jan 2016 08:59:37 GMThttp://repo.scoap3.org/record/13300urn:ISSN:1029-8479Springer/SISSA2016-01-04Generalized μ – τ reflection symmetry and leptonic CP violation
http://repo.scoap3.org/record/13285
We propose a generalized μ–τ reflection symmetry to constrain the lepton flavor mixing parameters. We obtain a new correlation between the atmospheric mixing angle θ23 and the “Dirac” CP violation phase δCP . Only in a specific limit our proposed CP transformation reduces to standard μ–τ reflection, for which θ23 and δCP are both maximal. The “Majorana” phases are predicted to lie at their CP-conserving values with important implications for the neutrinoless double beta decay rates. We also study the phenomenological implications of our scheme for present and future neutrino oscillation experiments including T2K, NO ν A and DUNE.Chen, PengWed, 30 Dec 2015 17:51:59 GMThttp://repo.scoap3.org/record/13285urn:ISSN:0370-2693Elsevier2017-09-09