Lepton Flavor Violating Decays of Neutral Higgses in Extended Mirror Fermion Model

We perform the one-loop induced charged lepton flavor violating decays of the neutral Higgses in an extended mirror fermion model with non-sterile electroweak-scale right-handed neutrinos and a horizontal $A_4$ symmetry in the lepton sector. We demonstrate that for the 125 GeV scalar $h$ there is tension between the recent LHC result ${\cal B}(h \to \tau \mu) \sim$ 1% and the stringent limits on the rare processes $\mu \to e \gamma$ and $\tau \to (\mu$ or $e) \gamma$ from low energy experiments.Comment: 23 pages, 3 figures. Added some of referenc

Multilepton Higgs Decays through the Dark Portal

The U(1)_D gauge sector containing one dark Higgs boson h_D and one dark photon \gamma_D may be explored through the decays of the 126 GeV particle discovered at the Large Hadron Collider (LHC), assumed here as the heavier mass eigenstate h_1 in the mixing of the standard model h with h_D. The various decays of h_1 to \gamma_D \gamma_D, h_2 h_2, h_2 \gamma_D \gamma_D and h_2 h_2 h_2 would yield multilepton final states through the mixing of \gamma_D with the photon and the decay h_2 \to \gamma_D \gamma_D, where h_2 is the lighter dark Higgs. Future searches for signals of multilepton jets at the LHC may reveal the existence of this possible dark sector governed simply by the original Abelian Higgs model.Comment: 20 pages, 9 figures, 2 tables. New section added for signals of multilepton jets at the LHC-1

Leading Effect of CP Violation with Four Generations

In the Standard Model with a fourth generation of quarks, we study the relation between the Jarlskog invariants and the triangle areas in the 4-by-4 CKM matrix. To identify the leading effects that may probe the CP violation in processes involving quarks, we invoke small mass and small angle expansions, and show that these leading effects are enhanced considerably compared to the three generation case by the large masses of fourth generation quarks. We discuss the leading effect in several cases, in particular the possibility of large CP violation in $b \to s$ processes, which echoes the heightened recent interest because of experimental hints.Comment: 12 pages, no figur

Cross-format integration between spoken number words and Arabic digits

Spoken number words and Arabic digits are the most commonly used numerical symbols. We often transcode numerals from one to another, thus, the correspondence between them should become over-learned and automatic after years of usage. It has been shown that an integration usually exists when pairing of stimulus is over-learned, and is often reflected in the mismatch negativity (MMN). The current thesis conducted two behavioural experiments (Chapter 2) and three EEG experiments (Chapter 3 - 5) to systematically investigate the cross-modal correspondence, i.e., the integration, between spoken number words and Arabic digits in adult participants. In the behavioural experiments, a clear distance effect is shown in an audiovisual matching task. This suggests that an amodal, shared magnitude representation is activated for cross-modal numerals during a matching judgment. Moreover, the distance effect is modulated by stimulus onset asynchrony (SOA). That is, the distance effect becomes smaller with the increase of SOA. This is similar to the data pattern of a common integration effect because an integration usually shows when cross-modal stimuli are temporally close. However, a disadvantage of a behavioural task is that the RTs could be influenced by response-selection or response-execution. Hence, I then used an oddball paradigm in which no responses are required for the cross-modal numerals in my EEG experiments. The results of three EEG experiments showed that an early integration effect exists between spoken number words and Arabic digits in the mismatch negativity (MMN). This result is first to show the presence of a cross-format integration between spoken number words and Arabic digits. However, the integration effect is also modulated by distance as well as stimulus onset asynchrony (SOA), which may suggest that the cross-modal correspondence between audiovisual numerals is more complicated than other kinds of audiovisual stimuli, such as letters and speech sounds

Rotating Black Holes and Coriolis Effect

In this work, we consider the fluid/gravity correspondence for general rotating black holes. By using the Petrov-like boundary condition in near horizon limit, we study the correspondence between gravitational perturbation and fluid equation. We find that the dual fluid equation for rotating black holes contains a Coriolis force term, which is closely related to the angular velocity of the black hole horizon. This can be seen as a dual effect for the frame-dragging effect of rotating black hole under the holographic picture.Comment: 5 page

A role for calcineurin in Dictyostelium discoideum phagocytosis

The Ca2+/calmodul1n-dependent protein phosphatase calcinewin is involved in the development of the cellular slime mold Dictyostelium discoideum. Because of its interactions with Ca2+, which appear to influence D. discoideum phagocytosis (Yuan and Chia, 1999, Mol. Biol. Cell 10, 220a), we undertook studies to test whether calcineurin also plays a role in Dictyostelium phagocytosis. The immunosuppressants cyclosporin A and FK506, through the formation of cyclosporin A-cyclophilin A and FK506- FK506-binding protein complexes, respectively, inhibited calcineurin activity. These two calcineurin inhibitors suppressed phagocytosis of fluorescently labeled yeast in a dose-dependent manner. Although it inhib~ted phagocytosis, cyclosporin A had an insignificant effect on the macropinocytosis of the fluid-phase marker fluorescein isothiocyanatedextran. Furthermore, trifluoperazine, a calmodulin antagonist that indirectly inhibits calcinewin, also suppressed phagocytosis in a dosedependent fashion and induced the formation of giant intracellular vacuoles Fluorescence microscopy of cyclosporin A-treated (for 30 min.) cells stained with rhodamine-phalloidin had cytoplasmic chunks of F-actin that were not present in control cells, while cells treated with FK506 and trifluoperazine (also for 30 min.), displayed less cortical but more cytoplasmic F-actin staining than normal cells. Typically, drug-treated cells were smaller and rounder than untreated cells. Our data suggest calcineurin may play a role in D. discoideum phagocytosis, either through the dephosphorylation of actinregulating proteins or other cytoskeletal proteins such as the heavy chain subunit of nonmuscle myosin I1 since dephosphorylation of the latter promotes filament assembly

A role for calcineurin in Dictyostelium discoideum phagocytosis

The Ca2+/calmodul1n-dependent protein phosphatase calcinewin is involved in the development of the cellular slime mold Dictyostelium discoideum. Because of its interactions with Ca2+, which appear to influence D. discoideum phagocytosis (Yuan and Chia, 1999, Mol. Biol. Cell 10, 220a), we undertook studies to test whether calcineurin also plays a role in Dictyostelium phagocytosis. The immunosuppressants cyclosporin A and FK506, through the formation of cyclosporin A-cyclophilin A and FK506- FK506-binding protein complexes, respectively, inhibited calcineurin activity. These two calcineurin inhibitors suppressed phagocytosis of fluorescently labeled yeast in a dose-dependent manner. Although it inhib~ted phagocytosis, cyclosporin A had an insignificant effect on the macropinocytosis of the fluid-phase marker fluorescein isothiocyanatedextran. Furthermore, trifluoperazine, a calmodulin antagonist that indirectly inhibits calcinewin, also suppressed phagocytosis in a dosedependent fashion and induced the formation of giant intracellular vacuoles Fluorescence microscopy of cyclosporin A-treated (for 30 min.) cells stained with rhodamine-phalloidin had cytoplasmic chunks of F-actin that were not present in control cells, while cells treated with FK506 and trifluoperazine (also for 30 min.), displayed less cortical but more cytoplasmic F-actin staining than normal cells. Typically, drug-treated cells were smaller and rounder than untreated cells. Our data suggest calcineurin may play a role in D. discoideum phagocytosis, either through the dephosphorylation of actinregulating proteins or other cytoskeletal proteins such as the heavy chain subunit of nonmuscle myosin I1 since dephosphorylation of the latter promotes filament assembly