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Fat penguins and imaginary penguins in perturbative QCD

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arxiv hep-ph/0004004 v3 pith:JKSBU3XH submitted 2000-04-01 hep-ph

Yong-Yeon Keum , Hsiang-nan Li , A.I. Sanda This is my paper · ORCID
classification hep-ph
keywords perturbativeamplitudesannihilationapproximationassumedbranchingcomparedconsistent
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We evaluate $B\to K\pi$ decay amplitudes in perturbative QCD picture. It is found that penguin contributions are dynamically enhanced by nearly 50% compared to those assumed in the factorization approximation. It is also shown that annihilation diagrams are not negligible, and give large strong phases. Our results for branching ratios of $B\to K\pi$ decays for a representative parameter set are consistent with data. We evaluate $B\to K\pi$ decay amplitudes in perturbative QCD picture. It is found that penguin contributions are dynamically enhanced by nearly 50% compared to those assumed in the factorization approximation. It is also shown that annihilation diagrams are not negligible, and give large strong phases. Our results for branching ratios of $B\to K\pi$ decays for a representative parameter set are consistent with data.

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Cited by 6 Pith papers

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

  1. Investigation of $\Lambda_{b}\to \Lambda_{c} \ell^-\overline\nu_\ell$ Decays in Perturbative QCD Approach

    hep-ph 2025-09 conditional novelty 6.0 of 10

    A leading-order pQCD calculation of all six Lambda_b to Lambda_c form factors, z-expanded and anchored to a lattice QCD point, predicts R_Lambda_c = 0.29+0.12-0.11, slightly above LHCb.

  2. Heavy quark mass dependence of the $\Lambda_Q$ light-cone distribution amplitude in QCD

    hep-ph 2026-07 conditional novelty 5.0 of 10

    The Lambda_Q baryon LCDA at mass m_Q equals (m_Q/m_Q^0)^2 times the LCDA at m_Q^0 evaluated at rescaled fractions x_i*m_Q/m_Q^0, times an exponentiated anomalous dimension, plus renormalon-model power corrections.

  3. $B_c$ meson decays into $S$-wave charmonium plus light meson pairs in the perturbative QCD approach

    hep-ph 2026-01 unverdicted novelty 5.0 of 10

    pQCD calculations predict ~90% longitudinal polarization in B_c to J/psi or psi(2S) plus rho or K* mediated light meson pairs, with one branching ratio ratio matching LHCb at 2.67 vs 2.80.

  4. Improved global determination of two-meson distribution amplitudes from multi-body $B$ decays

    hep-ph 2025-01 conditional novelty 5.0 of 10

    An improved global fit of two-meson distribution amplitudes in the PQCD framework yields better convergence of the Gegenbauer expansion and resolves the Bs→K*Kbar* polarization puzzle, though the headline results are ...

  5. Investigate the glueball-like particle $X(2370)$ in $B$ meson decays

    hep-ph 2025-01 conditional novelty 4.0 of 10

    Predictions for B to X(2370) branching fractions, around 10^-6 semileptonic and 10^-8 nonleptonic, suggest the glueball candidate is within Belle-II's reach.

  6. Unquenched Charmonium and Beyond

    hep-ph 2026-02 conditional novelty 2.0 of 10

    This Lanzhou-group review argues that coupled-channel (unquenched) effects, not exotic constituents, are the common thread explaining charmonium anomalies from the rho-pi puzzle to the Y-problem states.

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