118569125
Intrinsic Deviation from the Tri-bimaximal Neutrino Mixing in a Class of A 4 Flavor Models
It is well known that the tri-bimaximal neutrino mixing pattern V-0 can be derived from a class of flavor models with the non-Abelian A(4) symmetry. We point out that small corrections to V-0, which are inherent in the A(4) models and arise from both the charged-lepton and neutrino sectors, have been omitted in the previous works. We show that such corrections may lead the 3 x 3 neutrino mixing matrix V to a non-unitary deviation from V-0, but they cannot result in a nonzero value of theta(13) or any new CF-violating phases. Current experimental constraints on the unitarity of V allow us to constrain the model parameters to some extent. (C) 2010 Elsevier B.V. All rights reserved.
121113541
On the penguin phases and missing CP asymmetries in exclusive hadronic B decays
Within the standard model, we elucidate the picture of exclusive hadronic B-meson decays, which occur through both the tree and penguin channels. We emphasize that the weak penguin phase is entangled with the strong one and they can be parted only in special approximation. Ignoring this point will lead to significant missing of direct CP violation in either charged-B or neutral-B decays. The effects of these phases on CP-violating partial rate asymmetries are examined, and the relevant ambiguities in the previous literature are clarified.
122664221
Textures of quark mass matrices and renormalization effects
Two natural patterns of quark mass matrices are constructed at the electroweak scale, and their corresponding Yukawa coupling matrices are obtained at very high energy scales by use of the renormalization-group equations in the minimal supersymmetric standard model. It is found that the structural features of both patterns are essentially stable against renormalization effects. Some comments are also given on other possible ways to construct the stable textures of quark mass matrices.
17156834
Theoretical Overview of Neutrino Properties
I give an overview of some basic properties of massive neutrinos. The first part of this talk is devoted to three fundamental questions about three known neutrinos and to their flavor issues -- the mass spectrum, mixing pattern and CP violation. The second part of this talk is to highlight a few hot topics at the frontiers of neutrino physics and neutrino astrophysics, including the naturalness and testability of TeV seesaw mechanisms at the LHC, effects of non-standard interactions on neutrino oscillations, flavor distributions of ultrahigh-energy cosmic neutrinos at neutrino telescopes, collective flavor oscillations of supernova neutrinos, flavor effects in thermal leptogenesis, the GSI anomaly and Moessbauer neutrino oscillations, and so on. I finally make some concluding remarks for the road ahead.
14767884
Commutators of lepton mass matrices, CP violation, and matter effects in medium-baseline neutrino experiments
We introduce the commutators of lepton mass matrices to describe the phenomenon of lepton flavor mixing, and establish their relations to the effective Hamiltonians responsible for the propagation of neutrinos. The determinants of those commutators an invariant under matter effects, leading to an instructive relationship between the universal CP-violating parameters in vacuum and in matter. in the scenario of low-energy (100 MeV less than or equal toE less than or equal to1 GeV) and medium-baseline (100 km less than or equal toL less than or equal to 400 km) neutrino experiments, we illustrate the features of lepton flavor mixing and CP violation. The terrestrial matter effects on CP- and T-violating asymmetries in nu (e) nu (mu) and )over bar>(e) )over bar>(mu) neutrino oscillations are also discussed. We demonstrate that a relatively pure signal of leptonic CP violation at the percent level can be established from such medium-baseline experiments with low-energy neutrino beams.
119236714
A possible detection of the cosmic antineutrino background in the presence of flavor effects
Abstract Lusignoli and Vignati have recently pointed out that it is in principle possible to directly detect the cosmic antineutrino background ( C ν ¯ B ) by using the rather stable isotope 163 Ho as a target, which can decay into 163 Dy via electron capture (EC) with a very small energy release. In this Letter we calculate the rate of the relic antineutrino capture on 163 Ho nuclei against the corresponding EC decay rate by taking account of different neutrino mass hierarchies and reasonable values of θ 13 . We show that such flavor effects are appreciable and even important in some cases, and stress that a calorimetric measurement of the C ν ¯ B might be feasible in the far future.
121307979
Triaxiality of the yrast states of odd-A Lu isotopes
The energy spectra and electromagnetic transition probabilities of the negative-parity yrast states in odd-A Lu isotopes (Z=71) are investigated systematically using the particle-rotor model and are compared with experimental data before and after the band crossing. It is noted that the moment of inertia of the core after the band crossing is as much a smooth function of the total angular momentum I, as that before the band crossing and can be described by the ab formula. Appreciably different are the triaxial deformations before (similar to 20 degrees) and after (similar to+10 degrees) the band crossing for Lu-161,Lu-163,Lu-165, while they are more or less similar (similar to-10 degrees) for Lu-167 determined from the calculation. [S0556-2813(99)03910-2].