The European Physical Journal C

, Volume 70, Issue 4, pp 921–925 | Cite as

Power corrections in e + e π + π ,K + K and B,ππ

Open Access


CLEO-c measurements of the timelike form factors F π , F K at \(\sqrt{s}=3.671\) GeV provide a direct probe of power corrections (PC’s) at energies near m B . PC’s in F π,K and B,ππ are separated into perturbative and soft parts. In F π,K the latter are ≥O(10) larger. A PC fit to the B,ππ data also yields a ≥O(10) soft-to-perturbative hierarchy for the QCD penguin PC’s. Hence, both can be attributed to dominance of the soft-overlap between energetic (approximately) back-to-back collinear partons, and consistency of the B,ππ fit with the Standard Model appears to be naturally realized. The CP asymmetries \(S_{K_{s} \pi^{0}}\), \(C_{K_{s} \pi^{0}}\) are well determined, providing a clean test for new physics.


Power Correction Light Meson Lead Power Weak Annihilation Power Counting Rule 
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Copyright information

© The Author(s) 2010

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of CincinnatiCincinnatiUSA
  2. 2.Department of Physics and AstronomyUniversity of MississippiUniversityUSA

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