Chinese Physics C > 1988, Vol. 12 > Issue(1): 50-54

TADPOLE DIAGRAM,ΔI=1/2 ENHANCEMENT AND ε′/ε

ZHU Zhong-Yuan^,,
ZHANG Bo

Institute of Theoretical Physics,Academia Sinica,Beijing

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Abstract：
The contributions of tadpole diagrams including t and c quark intermediate states to the amplitude of K ⁰→2π and ε′/ε are analysed.The result shows it is quite possible that their contributions are the most important ones.They may give enough ΔI=1/2 enhancement for a reasonable quark relative momentum cutoff value which depends on K ⁰wave function.However,the calcualation value of │ε′/ε│ is too large if we suppose all CP violation effects come from the,Kobayashi-Maskawa phase δ. Perhaps,One approach to solve this difficulty is to assume the ε comes mainly from superweak CP violation.

References

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L. L. Chau, Phys. Rep., 95(1983), 12.[2] G. Feinberg, P. Kabir and S. Weinberg, Phys. Rev. Lett., 3(1959), 527.[3] B. H. J . Mckellar and M. D. Seadron, Phys. Rev.,D27(1983), 157.[4] Z. Y. Zhu, et al. Aromic Energy (in Chinese) 3(1966); Freund, Phys. Lett. 15(1965), 352.[5] M. D. Scadron, Rep. Prog. Phys., 44(1981), 241.[6] J . F. Donoghue and B. R. Holstein, Phys. Rev. D29(1984), 2086.[7] J. F. Donoghue, Phys. Rep., 131(1986), 392.[8] M. Aguilar-Benitez, et. Phys. Lett., 170B(1986), 1.[9] S. Weinberg, Phys. Rev. Lett., 31(1976), 657.

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ZHU Zhong-Yuan and ZHANG Bo. TADPOLE DIAGRAM,ΔI=1/2 ENHANCEMENT AND ε′/ε[J]. Chinese Physics C, 1988, 12(1): 50-54.

ZHU Zhong-Yuan and ZHANG Bo. TADPOLE DIAGRAM,ΔI=1/2 ENHANCEMENT AND ε′/ε[J]. Chinese Physics C, 1988, 12(1): 50-54. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

TADPOLE DIAGRAM,ΔI=1/2 ENHANCEMENT AND ε′/ε

ZHU Zhong-Yuan^,
ZHANG Bo

Corresponding author:ZHU Zhong-Yuan,

Institute of Theoretical Physics,Academia Sinica,Beijing

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1988-02-05

Abstract:The contributions of tadpole diagrams including t and c quark intermediate states to the amplitude of K⁰→2π and ε′/ε are analysed.The result shows it is quite possible that their contributions are the most important ones.They may give enough ΔI=1/2 enhancement for a reasonable quark relative momentum cutoff value which depends on K⁰wave function.However,the calcualation value of │ε′/ε│ is too large if we suppose all CP violation effects come from the,Kobayashi-Maskawa phase δ. Perhaps,One approach to solve this difficulty is to assume the ε comes mainly from superweak CP violation.