1. Gyeong Hyun, Min C. S. Kim Group.
Probing Z′ gauge boson with the spin configuration of top quark pair production at future e−e+ linear colliders
Gyeong Hyun, Min
C. S. Kim Group.

2. Contents Abstract INTRODUCTION Z′ BOSON IN SUPERSYMMETRIC E6 MODEL
Types of Z′ bosons
U(1) extension
Kinetic Mixing
In this paper
Z′ BOSON IN SUPERSYMMETRIC E6 MODEL
E6 MODEL
η model
U(1)’ charge
Lagrangian with Z′ boson
Transformation
Lagrangian of the mass eigenstates Z1, Z2
TOP QUARK PAIR PRODUCTION IN THE OFF-DIAGONAL BASIS
Process – center of mass frame
Process – rest frame
Scattering amplitudes
ANALYSIS
The differential cross sections in the ψ-model
The differential cross sections in the χ-model
The differential cross sections in the η-model
The ratios of the cross section
SUMMARY AND CONCLUSIONS
Summary
Conclusions

3. Abstract

4. Ⅰ. INTRODUCTION

5. Types of Z′ bosons

6. U(1) extension Standard Model part New part : As low as O(1) TeV scale
photon
New particle : called Z’

7. Kinetic Mixing (no direct coupling) (couples through SM gauge bosons)
Z’ can couple to SM particles through kinetic mixing
(no direct coupling)
(couples through SM gauge bosons)

8. In this paper

9. Ⅱ. Z′ BOSON IN SUPERSYMMETRIC E6 MODEL

10. E6 MODEL

11. η model

12. U(1)’ charge

13. Lagrangian with Z′ boson

14. Transformation

15. Lagrangian of the mass eigenstates Z1, Z2

16. Ⅲ. TOP QUARK PAIR PRODUCTION IN THE OFF-DIAGONAL BASIS

17. Process – center of mass frame

18. Process – rest frame

19. Scattering amplitudes(1)

20. Scattering amplitudes(2)

21. Scattering amplitudes(3)

22. Ⅳ. ANALYSIS

23. The differential cross sections in the ψ-model

24. The differential cross sections in the χ-model

25. The differential cross sections in the η-model

26. The ratios of the cross section

27. Ⅴ. SUMMARY AND CONCLUSIONS

28. Summary We have explored the effects of Z′ boson.
in the supersymmetric E6 model.
at process frame-work.
including the kinetic mixing terms.
Considering the spin configuration of produced top quark pair.
to search for the Z’ boson.
to discriminate the models corresponding to the pattern of gauge group decomposition.

29. Conclusions
The existence of nonzero cross sections for diagonal spin states, can be a direct evidence of new physics.
is an effectual observable to probe Z′ boson due to the asymmetry of left- and right-handed couplings of Z′ boson to fermions.
it is shown that the kinetic mixing effects results in substantial shift on the observables.
changing the sign of kinetic mixing term, its effects can be additive or subtractive to the mass mixing effects, by which it is possible that the Z′ effects.

30. Thank you.
Thank you for listen.