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Title: Determining the sign of the Z-penguin amplitude

Abstract

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.

Authors:
 [1];  [2]
  1. Institut fuer Theoretische Physik, Universitaet Zuerich, CH-8057 Zuerich (Switzerland)
  2. Institute for High Energy Phenomenology, Newman Laboratory of Elementary Particle Physics, Cornell University, Ithaca, New York 14853 (United States)
Publication Date:
OSTI Identifier:
21032354
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.76.074027; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; AMPLITUDES; B S MESONS; BRANCHING RATIO; FLAVOR MODEL; KAONS PLUS; LEP STORAGE RINGS; MUONS MINUS; MUONS PLUS; NEUTRINOS; PARTICLE DECAY; PIONS NEUTRAL; PIONS PLUS; STANDARD MODEL; STANFORD LINEAR COLLIDER

Citation Formats

Haisch, Ulrich, and Weiler, Andreas. Determining the sign of the Z-penguin amplitude. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.76.074027.
Haisch, Ulrich, & Weiler, Andreas. Determining the sign of the Z-penguin amplitude. United States. https://doi.org/10.1103/PHYSREVD.76.074027
Haisch, Ulrich, and Weiler, Andreas. 2007. "Determining the sign of the Z-penguin amplitude". United States. https://doi.org/10.1103/PHYSREVD.76.074027.
@article{osti_21032354,
title = {Determining the sign of the Z-penguin amplitude},
author = {Haisch, Ulrich and Weiler, Andreas},
abstractNote = {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.},
doi = {10.1103/PHYSREVD.76.074027},
url = {https://www.osti.gov/biblio/21032354}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 76,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2007},
month = {Mon Oct 01 00:00:00 EDT 2007}
}