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New Bound on gamma from B^+- -> pi K Decays

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arxiv hep-ph/9808493 v2 pith:YP3M6JQW submitted 1998-08-31 hep-ph

M. Neubert (CERN) , J.L. Rosner (Chicago) This is my paper · ORCID
classification hep-ph
keywords bounddecaysgammaanalysisderivedtriangleunitarityaccount
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A bound on the angle gamma of the unitarity triangle is derived using experimental information on the CP-averaged branching ratios for the rare decays B^+- -> pi^+- K^0 and B^+- -> pi^0 K^+-. The theoretical description is cleaner than the Fleischer-Mannel analysis of the decays B^+- -> pi^+- K^0 and B^0 -> pi^-+ K^+- in that the two decay rates differ only in a single isospin amplitude, which has a simple structure in the SU(3) limit. As a consequence, electroweak penguin contributions and strong rescattering effects can be taken into account in a model-independent way. The resulting bound excludes values of cos(gamma) around 0.6 and is thus largely complementary to indirect constraints derived from a global analysis of the unitarity triangle.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Isospin-based EWP-tree Relations

    hep-ph 2025-10 unverdicted novelty 7.0 of 10

    Under isospin alone, electroweak-penguin diagrams in B→πK decays are proportional to tree diagrams with roles swapped relative to SU(3)_F, yielding an exact CP-asymmetry sum rule and a 4-5σ B→πK discrepancy with the S...

  2. Flavor Violations in $B$-Mesons within Non-Minimal SU(5)

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A non-minimal SU(5) model with R2 leptoquark and S6 diquark is fitted to B-decay anomalies in b→cτν, B→Kπ, and B→Kνν, but the benchmark B→Kνν rate rises only about 3.5% above the Standard Model.

  3. Comment on "QCD-factorization amplitudes from flavour symmetries: beyond the $SU(3)$ symmetric case''

    hep-ph 2026-06 unverdicted novelty 2.0 of 10

    The authors argue that ETRs follow automatically from SU(3) group theory and identify weaknesses in a recent QCD-factorization fit that omitted them.

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