1. B→φK s in vector-like quark model Masato Senami (ICRR, the University of Tokyo) K. Higuchi, MS and K. Yamamoto in preparation

2. Contents 1. Introduction 2. Model electric dipole moment 3. B →φK s 4. Summary Contents

3. Motivation CP violation in  Standard Model New physics beyond the Standard model? Introduction vector-like down type quark

4. Vector-like down type quark model Vector-like down type quark + Higgs singlet S Model d-D quark mixing SU(2) singlet, U(1) → ±1/3 mass term for vector-like quark E6 GUT

5. Flavor mixing Model ξ: neutral Higgs Z:Z: Higgs: no mixing weak basis → mass basis

6. Constraint for Z One extra D quark scenario Model Z’ bs Z to bb － D. Atwood, G. Hiller, hep-ph/0307251 N.G. Deshpande, D. K. Ghosh, hep-ph/0311332

7. Electric dipole moment Experimental constraint Hisano, Shimizu hep-ph/0406091 Z mediated flavor mixing no contribution Model

8. Electric dipole moment Neutral Higgs mediated flavor mixing Model constrains Contribution to EDM

9. B → φK s Standard model contribution B → φKs B → φKs b s s s － explains B → φKs

10. B → φK s Z FCNC  For  One D model scalar FCNC B → φKs B → φKs b s s s b s s s － －

11. B → φK s constraint   small contribution to  Z FCNC multi D quark 1 D quark  scalar FCNC EDM negative B → φKs B → φKs 20 % compared to SM contribtion

12. B → φK s 2 or more D quark B → φKs B → φKs

13. B → φK s 1 D quark scenario B → φKs B → φKs

14. Conclusion Vector-like down type quark + Higgs singlet  E6 GUT, baryogenesis  1 D quark  2 D quark  Higgs singlet → EDM