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In the limit of flavor SU(3) symmetry, the amplitudes for Bd->pi^+\pi^- andBs-> K^+ K^- are related to one another. Taking the values of the weak phasesbeta and gamma from independent measurements, the ratio Rds=BR(Bs->K^+K^-)/BR(Bd->pi^+ pi^-) and the two Bd->pi^+pi^- CP asymmetries Adir and Amixdepend on only two quantities. By measuring these three observables, one cantest for the presence of physics beyond the standard model. In this paper,using present data, and including theoretical uncertainties due to SU(3)breaking, we perform such an analysis. The experimental errors are still verylarge, but with improved measurements from Babar, Belle and CDF this will be auseful method to search for new physics.Comment: 4 pages with 5 figures. Introduction modified; brief discussion about  SU(3) breaking added; references changed. Conclusions unchanged. To be  published in PRD: Rapid Communication

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Testing the standard model with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></…

Testing the standard model withBs0→K+K−