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7 papers · 2 filters
Scalar Mesons in QCD
Stephan Narison
We review the analysis of the quark and gluon substructures of the scalar mesons from QCD spectral sum rules and some low-energy theorems applied to the scalar QCD anomaly current.…
V-A hadronic tau decays : a QCD laboratory
Stephan Narison
Recent ALEPH/OPAL data on the V-A spectral functions from hadronic tau decays are used for fixing the QCD continuum threshold at which the first and second Weinberg sum rules shoul…
Quasi-multi-Regge Processes with a Quark Exchange in the t-channel
L. N. Lipatov, M. I. Vyazovsky
The QCD amplitudes for particle's production in the quasi-multi-Regge kinematics with a quark exchange in crossing channels are calculated in the Born approximation. In particular…
On the Quark and Gluon Substructure of the Sigma and other Scalar Mesons
Stephan Narison
Within the increasing experimental evidence of the existence of the I=0 scalar low mass and wide σmeson, we review the {\it first} analysis of its quark and gluon substructure from…
New QCD estimate of the kaon penguin matrix elements and epsilon'/epsilon
Stephan Narison
Firstly, we use the recent ALEPH/OPAL data on the V-A spectral functions for fixing the continuum threshold with which the first and second Weinberg sum rules should be satisfied i…
Light Hybrid Mesons in QCD
K. G. Chetyrkin, Stephan Narison
Including the radiative perturbative corrections and the short distance tachyonic gluon mass effects which mimic the ones of UV renormalons, we re-estimate the decay amplitudes, ma…