Determining the sign of the Z-penguin amplitude
- Institut fuer Theoretische Physik, Universitaet Zuerich, CH-8057 Zuerich (Switzerland)
- Institute for High Energy Phenomenology, Newman Laboratory of Elementary Particle Physics, Cornell University, Ithaca, New York 14853 (United States)
We point out that the precision measurements of the pseudo observables R{sub b}{sup 0}, A{sub b}, and A{sub FB}{sup 0,b} performed at the CERN LEP and the Stanford Linear Collider 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 nonstandard 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{sup +}{yields}{pi}{sup +}{nu}{nu}, K{sub L}{yields}{pi}{sup 0}{nu}{nu}, K{sub L}{yields}{mu}{sup +}{mu}{sup -}, B{yields}X{sub d,s}{nu}{nu}, and B{sub d,s}{yields}{mu}{sup +}{mu}{sup -} within constrained minimal-flavor violation, making use of the wealth of available data collected at the Z pole.
- OSTI ID:
- 21032354
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 7; Other Information: DOI: 10.1103/PhysRevD.76.074027; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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