Makiko Nagashima

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Wsc1p is a major cell wall sensor protein localized at the polarized cell surface. The localization of Wsc1p is maintained by endocytosis and recycling from endosomes back to the cell surface, but changes to the vacuole when cells are subjected to heat stress. Exploiting this unique property of Wsc1p, we screened for yeast single-gene deletion mutants(More)
We study the effect from a sequential fourth generation quark on penguin-dominated two-body nonleptonic B meson decays in the next-to-leading order perturbative QCD formalism. With an enhancement of the color-suppressed tree amplitude and possibility of a new CP phase in the electroweak penguin amplitude, we can account better for A(CP)(B(0)-->K+(More)
Within the standard model, a relation involving branching ratios and direct CP asymmetries holds for the B-decay pairs that are related by U-spin. The violation of this relation indicates new physics (NP). In this paper, we assume that the NP affects only the ∆S = 1 decays, and show that the NP operators are generally the same as those appearing in B → πK(More)
Direct CP violation in B0 --> K+ pi- decay has emerged at the -10% level, but the asymmetry in B+ --> K+ pi0 mode is consistent with zero. This difference points towards possible new physics in the electroweak penguin operator. We point out that a sequential fourth generation, with sizable V(t' s)* V(t' b) and near maximal phase, could be a natural cause.(More)
Two recent experimental developments, when combined, may have far-reaching implications. S(phiK(S))<0, if confirmed, would imply large s-b mixing, a new CP phase, and right-handed dynamics. Large Deltam(B(s)) would be likely, making the B(s) program at hadron machines difficult. Reconstruction of B vertex from K(S) at B factories, as shown by BaBar's first(More)
B → φK * (¯ b → ¯ s) is three separate decays, one for each polarization of the final-state vector mesons (one longitudinal, two transverse). It is observed that the fraction of transverse decays, f T , and the fraction of longitudinal decays, f L , are roughly equal: f T /f L ≃ 1, in opposition to the naive expectation that f T ≪ f L. If one requires a(More)
We consider CP-violating effects in τ → Kππν τ , assuming that a charged Higgs boson provides a new amplitude that can interfere with the usual Standard Model amplitude. We consider four CP-odd observables – the regular rate asymmetry, two modified rate asymmetries and a triple-product asymmetry. The regular rate asymmetry is expected to be small because it(More)
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