Constraining Quark - Hadron Duality at Large
نویسنده
چکیده
Quark-meson duality for two-point functions of vector and axial-vector QCD currents is investigated in the large-Nc approximation. We find that the joint constraints of duality and chiral symmetry imply degeneracy of excited vector and axial-vector mesons in the large-Nc limit. We compare model-independent constraints with expectations based on the VenezianoLovelace-Shapiro string model. Several models of duality are constructed, and phenomenological implications are discussed.
منابع مشابه
Quark-Hadron Duality in Electron Scattering
Quark-hadron duality addresses some of the most fundamental issues in strong interaction physics, in particular the nature of the transition from the perturbative to non-perturbative regions of QCD. I summarize recent developments in quark-hadron duality in lepton–hadron scattering, and outline how duality can be studied at future high-luminosity facilities such as Jefferson Lab at 12 GeV or an...
متن کاملHow quark hadron duality in QCD may work
We pursue the issue of the local quark-hadron duality at high energies in twoand four-dimensional QCD. A mechanism of the dynamical realization of the quark-hadron duality in two-dimensional QCD in the limit of large number of colors, Nc → ∞, (the ’ t Hooft model) is investigated. We argue that a similar mechanism of dynamical smearing may be relevant in four-dimensional QCD. Although particula...
متن کاملAn Illustrative Example of How Quark-Hadron Duality Might Work
We discuss the issue of the local quark-hadron duality at high energies in twoand four-dimensional QCD. A mechanism of the dynamical realization of the quark-hadron duality in two-dimensional QCD in the limit of large number of colors, Nc → ∞, (the ’t Hooft model) is considered. A similar mechanism of dynamical smearing may be relevant in four-dimensional QCD. Although particular details of our...
متن کاملQuark-Hadron Duality for Hybrid Mesons at Large-Nc
We investigate implications of quark-hadron duality for hybrid mesons in the large-Nc limit. A simple formalism is developed which implements duality for QCD two-point functions of currents of quark bilinears, with any number of gluons. We argue that the large-Nc meson masses share a common parameter, which is related to the QCD string tension. This parameter is fixed from correlators of conser...
متن کاملTop-antitop Pair Production via B-quark Initiated Processes at the Large Hadron Collider
We study bt t production via subprocesses initiated by b-quarks at the Large Hadron Collider. Both QCD and electroweak interactions are included in the elementary scattering amplitudes for bg ! bt t. Since the additional jet in the nal state (arising from the bottom quark) is in most cases at very low transverse momentum and very high pseudorapidity, it tends to escape detection. Therefore, suc...
متن کامل