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Determining the Sign of the Z-Penguin Amplitude

Abstract:

We point out that the precision measurements of the pseudo observables R_b^0, A_b, and A_FB^0,b performed at LEP and SLC suggest that in models with minimal-flavor-violation the sign of the Z-penguin amplitude is identical to the one present in the standard model. We determine the allowed range for the non-standard contribution to the Inami-Lim function C and show by analyzing possible scenarios with positive and negative interference of standard model and new physics contributions, that the ...

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Publisher copy:
10.1103/PhysRevD.76.074027

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Theoretical Physics
Role:
Author
Journal:
Phys.Rev.D
Volume:
76
Pages:
074027
Publication date:
2007-06-14
DOI:
URN:
uuid:7bd266eb-6665-48fa-a815-23f2dbe0f075
Source identifiers:
177532
Local pid:
pubs:177532
Keywords:

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