3,745 research outputs found

    Simplified Renormalizable T′T^{'} Model for Tribimaximal Mixing and Cabibbo Angle

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    In a simplified renormalizable model where the neutrinos have PMNS (Pontecorvo-Maki-Nakagawa-Sakata) mixings tan2θ12=1/2,θ13=0,θ23=π/4^{2} \theta_{12} = {1/2}, \theta_{13}=0, \theta_{23} = \pi/4 and with flavor symmetry T′T^{'} there is a corresponding prediction where the quarks have CKM (Cabibbo-Kobayashi-Maskawa) mixings tan2Θ12=23,Θ13=0,Θ23=02 \Theta_{12} = \frac{\sqrt{2}}{3}, \Theta_{13}=0, \Theta_{23} =0.Comment: Further typos correcte

    Analysis of Quark Mixing Using Binary Tetrahedral Flavor Symmetry

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    Using the binary tetrahedral group T′T^{'}, the three angles and phase of the quark CKM mixing matrix are pursued by symmetry-breaking which involves T′T^{'}-doublet VEVs and the Chen-Mahanthappa CP-violation mechanism. The NMRT′^{'}M, Next-to-Minimal-Renormalizable -T′^{'}-Model is described, and its one parameter comparison to experimental data is explored.Comment: 14 pages latex. Two .eps figures include

    Enhanced energy relaxation process of quantum memory coupled with a superconducting qubit

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    For quantum information processing, each physical system has different advantage for the implementation and so hybrid systems to benefit from several systems would be able to provide a promising approach. One of the common hybrid approach is to combine a superconducting qubit as a controllable qubit and the other quantum system with a long coherence time as a memory qubit. The superconducting qubit allows us to have an excellent controllability of the quantum states and the memory qubit is capable of storing the information for a long time. By tuning the energy splitting between the superconducting qubit and the memory qubit, it is believed that one can realize a selective coupling between them. However, we have shown that this approach has a fundamental drawback concerning energy leakage from the memory qubit. The detuned superconducting qubit is usually affected by severe decoherence, and this causes an incoherent energy relaxation from the memory qubit to the superconducting qubit via the imperfect decoupling. We have also found that this energy transport can be interpreted as an appearance of anti quantum Zeno effect induced by the fluctuation in the superconducting qubit. We also discuss a possible solution to avoid such energy relaxation process, which is feasible with existing technology

    Phase Transition in a One-Dimensional Extended Peierls-Hubbard Model with a Pulse of Oscillating Electric Field: II. Linear Behavior in Neutral-to-Ionic Transition

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    Dynamics of charge density and lattice displacements after the neutral phase is photoexcited is studied by solving the time-dependent Schr\"odinger equation for a one-dimensional extended Peierls-Hubbard model with alternating potentials. In contrast to the ionic-to-neutral transition studied previously, the neutral-to-ionic transition proceeds in an uncooperative manner as far as the one-dimensional system is concerned. The final ionicity is a linear function of the increment of the total energy. After the electric field is turned off, the electronic state does not significantly change, roughly keeping the ionicity, even if the transition is not completed, because the ionic domains never proliferate. As a consequence, an electric field with frequency just at the linear absorption peak causes the neutral-to-ionic transition the most efficiently. These findings are consistent with the recent experiments on the mixed-stack organic charge-transfer complex, TTF-CA. We artificially modify or remove the electron-lattice coupling to discuss the origin of such differences between the two transitions.Comment: 17 pages, 9 figure

    LHC Higgs Production and Decay in the T' Model

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    At s=7\sqrt{s} = 7 TeV, the standard model needs at least 10 (fb)−110\, (fb)^{-1} integrated luminosity at LHC to make a definitive discovery of the Higgs boson. Using binary tetrahedral (T′T^{'}) discrete flavor symmetry, we discuss how the decay of the lightest T′T' Higgs into γ γ\gamma\,\gamma can be effectively enhanced and dominate over its decay into b bˉb \, \bar{b}. Since the two-photon final state allows for a clean reconstruction, a decisive Higgs discovery may be possible at 7 TeV with the integrated luminosity only of ∼1 (fb)−1\sim 1\, (fb)^{-1}.Comment: 17 pages, 9 figure

    High-K Precession modes: Axially symmetric limit of wobbling motion

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    The rotational band built on the high-K multi-quasiparticle state can be interpreted as a multi-phonon band of the precession mode, which represents the precessional rotation about the axis perpendicular to the direction of the intrinsic angular momentum. By using the axially symmetric limit of the random-phase-approximation (RPA) formalism developed for the nuclear wobbling motion, we study the properties of the precession modes in 178^{178}W; the excitation energies, B(E2) and B(M1) values. We show that the excitations of such a specific type of rotation can be well described by the RPA formalism, which gives a new insight to understand the wobbling motion in the triaxial superdeformed nuclei from a microscopic view point.Comment: 14 pages, 8 figures (Spelling of the authors name was wrong at the first upload, so it is corrected
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