Chiral Condensates, Q_7 and Q_8 Matrix Elements and Large-N_c QCD

Abstract

The correlation function of a $V-A$ current with a $V+A$ current is discussed within the framework of QCD in the limit of a large number of colours $N_c$. Applications to the evaluation of chiral condensates of dimension six and higher, as well as to the matrix elements of the $Q_7$ and $Q_8$ electroweak penguin operators are discussed. A critical comparison with previous determinations of the same parameters has also been made.

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• Precision Tau Physics
• Power corrections to alpha_s(M_τ),|V_{us}| and m_s
• Duality violations and spectral sum rules
• Geometric approach to condensates in holographic QCD
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• Unraveling duality violations in hadronic tau decays
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• The S-parameter in Holographic Technicolor Models
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• Pinched weights and Duality Violation in QCD Sum Rules: a critical analysis
• Violation of Quark-Hadron Duality and Spectral Chiral Moments in QCD
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• QCD Description of Hadronic Tau Decays
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• Weinberg like sum rules revisited
• Perturbative QCD in acceptable schemes with holomorphic coupling
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• Correlators of hadron currents: the model and the ALEPH data on tau-decay
• Duality violation in QCD Sum Rules with the LR correlator
• Kaon weak interactions in powers of 1/Nc
• Impact of Duality Violations on Spectral Sum Rule Analyses