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Penguins with charm and quark–hadron duality

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Abstract

The integrated branching fraction of the process B→X s l + l − is dominated by resonance background from narrow charmonium states, such as B→X s ψ→X s l + l −, which exceeds the non-resonant charm-loop contribution by two orders of magnitude. The origin of this fact is discussed in view of the general expectation of quark–hadron duality. The situation in B→X s l + l − is contrasted with charm-penguin amplitudes in two-body hadronic B decays of the type B→π π, for which it is demonstrated that resonance effects and the potentially non-perturbative \(c\bar{c}\) threshold region do not invalidate the standard picture of QCD factorization. This holds irrespective of whether the charm quark is treated as a light or a heavy quark.

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Authors and Affiliations

  1. Institut für Theoretische Physik E, RWTH Aachen University, 52056, Aachen, Germany

    M. Beneke

  2. CERN Theory Department, 1211, Genève, Switzerland

    M. Beneke

  3. Fakultät für Physik, Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, 80333, München, Germany

    G. Buchalla

  4. Institut für Physik (THEP), Johannes Gutenberg-Universität, 55099, Mainz, Germany

    M. Neubert

  5. School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK

    C. T. Sachrajda

Authors
  1. M. Beneke
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  2. G. Buchalla
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  3. M. Neubert
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  4. C. T. Sachrajda
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Corresponding author

Correspondence to G. Buchalla.

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Beneke, M., Buchalla, G., Neubert, M. et al. Penguins with charm and quark–hadron duality. Eur. Phys. J. C 61, 439–449 (2009). https://doi.org/10.1140/epjc/s10052-009-1028-9

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  • DOI: https://doi.org/10.1140/epjc/s10052-009-1028-9

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