Bd^0(t)->pi^+pi^- and Bs^0(t)-> K^+ K^- Decays: A Tool to Measure New-Physics Parameters

Abstract

If physics beyond the standard model is present in B decays, experimental measurements seem to suggest that it principally affects those processes with significant b->s penguin amplitudes. It was recently argued that, in general, such new-physics (NP) effects can be parametrized in terms of a single NP amplitude A^q and phase Φ_q, for q=u,d,s,c. In this paper, we show that the study of the decays Bs(t) -> K^+ K^- and Bd(t) -> π^+π^- allows one to measure the NP parameters A^u and Φ_u. We examine the implications for this method of the latest experimental results on these decays. If NP is found in Bs(t) -> K^+ K^-, it can be partially identified through measurements of Bs(t)-> K^0 \bar K^0.

arXiv comment12 pages, 2 figures, LaTeX. Changed references

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• Search for B_{s}^{0}->hh Decays at the ${\rm Y}(5S)$ Resonance
• Bs-->K+K- and Bs-->K0 anti-K0 Decays within Supersymmetry
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• B_s\to K^{(*)-}K^{(*)+}, K^{(*)-}π^{+}, K^{(*)-}ρ^{+} decays in R-parity violating supersymmetry
• Extracting alpha from B0(d) --> K0 anti-K0 Decays
• Determining weak phase gamma and probing new physics in b->s transitions from B->eta(eta')K
• Sum rules for B-->pi eta('), K eta('), eta(') eta(') decays