Negative Vertex Contributions to Parameters S and T From Charged Pseudo-Goldstone Boson
Abstract
We describe how to incorporate the one-loop vertex corrections on Zb\bar b coming from the virtual charged pseudo-Goldstone bosons (PGB) P^+/- and P_8^+/- in one-generation technicolor model into the estimation for the value of Peskin-Takeuchi parameters S and T. We find that the vertex contributions SV and TV are all negative and can cancel out the positive oblique contributions Shad and Thad. Now the value of S can be negative and T is also much smaller than the traditional estimation.
The project supported in part by National Natural Science Foundation of China and the funds from Henan Science and Technology Committee.- Publication:
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Communications in Theoretical Physics
- Pub Date:
- July 1995
- DOI:
- 10.1088/0253-6102/24/1/91
- Bibcode:
- 1995CoTPh..24...91X