A symmetry-guided phenomenological model organizes leading current-current operators for charged-current decays of heavy-light mesons and reproduces heavy-quark scaling relations for decay constants and form factors.
ELECTROWEAK PENGUINS AND TWO-BODY B DECAYS
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abstract
We discuss the role of electroweak penguins in $B$ decays to two light pseudoscalar mesons. We confirm that the extraction of the weak phase $\alpha$ through the isospin analysis involving $B\to\pi\pi$ decays is largely unaffected by such operators. However, the methods proposed to obtain weak and strong phases by relating $B\to\pi\pi$, $B\to\pi K$ and $B\to KK$ decays through flavor SU(3) will be invalidated if electroweak penguins are large. We show that, although the introduction of electroweak penguin contributions introduces no new amplitudes of flavor SU(3), there are a number of ways to experimentally measure the size of such effects. Finally, using SU(3) amplitude relations we present a new way of measuring the weak angle $\gamma$ which holds even in the presence of electroweak penguins.
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hep-ph 5representative citing papers
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 Standard Model.
A data-driven SU(3)-breaking analysis of B to PP decays yields QCD-factorization amplitudes that resemble dynamical predictions and require no enhanced annihilation terms.
Topological amplitude decomposition of two-body B→B_c B̄_c decays with modeled SU(3) breaking fits 9 measured branching ratios and predicts rates for unmeasured modes, finding 35% SU(3) breaking and sizable W-exchange contributions.
Incorporating new Belle II data into the B to pi K system analysis provides fresh insight into the long-standing puzzle regarding CP violation.
citing papers explorer
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A Phenomenological Model of Mesons for Charged Current Weak Decays
A symmetry-guided phenomenological model organizes leading current-current operators for charged-current decays of heavy-light mesons and reproduces heavy-quark scaling relations for decay constants and form factors.
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Isospin-based EWP-tree Relations
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 Standard Model.
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QCD-factorization amplitudes from flavour symmetries: beyond the $SU(3)$ symmetric case
A data-driven SU(3)-breaking analysis of B to PP decays yields QCD-factorization amplitudes that resemble dynamical predictions and require no enhanced annihilation terms.
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Two-body charmed anti-charmed baryonic $B$ decays
Topological amplitude decomposition of two-body B→B_c B̄_c decays with modeled SU(3) breaking fits 9 measured branching ratios and predicts rates for unmeasured modes, finding 35% SU(3) breaking and sizable W-exchange contributions.
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Shedding New Light on the ${B \to \pi K}$ Puzzle
Incorporating new Belle II data into the B to pi K system analysis provides fresh insight into the long-standing puzzle regarding CP violation.