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 derived bound holds in each given case. Finally, we derive lower and upper limits for the branching ratios of K^+ -> pi^+ nu nubar, K_L -> pi^0 nu nubar, K_L -> mu^+ mu^-, B -> X_d,s nu nubar, and B_d,s -> mu^+ mu^- within constrained minimal-flavor-violation making use of the wealth of available data collected at the Z-pole.

20 pages, 5 pdf figures, 5 tables, uses pdflatex; further typos corrected, matches PRD version

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Cited by in corpus (10)

• Flavor Physics in the Randall-Sundrum Model: I. Theoretical Setup and Electroweak Precision Tests
• Constraints on New Physics in MFV models: a model-independent analysis of Delta F=1 processes
• A GIM Mechanism from Extra Dimensions
• K1(1270)-K1(1400) Mixing Angle and New-Physics Effects in B to K1 l+ l- Decays
• On the consistency between the observed amount of CP violation in the K- and Bd-systems within minimal flavor violation
• Probing anomalous $t\bar{t}Z$ interactions with rare meson decays
• Anti-B --> X(s) gamma in two universal extra dimensions
• Suppressed FCNC in New Physics with Shared Flavor Symmetry
• Testing the CKM Picture of Flavour and CP Violation in Rare K and B Decays and Particle-Antiparticle Mixing
• SUSY beyond minimal flavour violation