منابع مشابه
Qcd Correlators at Large N C
This talk explores the spin–1 correlators up to O(αs) through a large NC resonance theory. The phenomeno-logical analyses of this kind must take these corrections into account since they produce a larger impact than the first OPE condensates. It is also necessary to separate low and high energy regimes; fixing the parameters of the lightest multiplets through perturbative QCD arguments is unfai...
متن کاملMesons at large Nc from lattice QCD
We calculate the pion and ρ meson masses in quenched SU(N) gauge theories for N = 2, 3, 4 and 6. Extrapolating these results to the chiral and large-N limits, we find mρ = (1.670± 0.024) √ σ = (741± 11) MeV for the ρ meson mass at a fixed lattice spacing a ≈ 0.093 fm. We estimate a continuum value, mρ = (786 ± 22) MeV, where we use the value σ = 1 GeV/fm ≈ (444 MeV) for the string tension. We f...
متن کاملBaryon-Pion Couplings from Large-Nc QCD
We derive a set of consistency conditions for the pion-baryon coupling constants in the large-Nc limit of QCD. The consistency conditions have a unique solution which are precisely the values for the pion-baryon coupling constants in the Skyrme model. We also prove that non-relativistic SU(2Nf ) spin-flavor symmetry (where Nf is the number of light flavors) is a symmetry of the baryon-pion coup...
متن کاملV + A and V − A Correlators at Large NC: From OPE to Resonance Theory ∗
The spin–1 correlators are analysed in this talk through a large NC resonance theory. The matching to perturbative QCD and the first terms in the OPE constrains the hadronic parameters. A further sum-rule analysis shows the wider range of validity of the resonance description, which can help to discern the proper structure of the QCD mass spectrum.
متن کاملCurrent correlators in QCD : OPE versus large distance dynamics
Current correlators in QCD: OPE versus large distance dynamics. Abstract We analyse the structure of current-current correlators in coordinate space in large N c limit when the corresponding spectral density takes the form of an infinite sum over hadron poles. The latter are computed in the QCD string model with quarks at the ends, including the lowest states, for all channels. The correspondin...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2007
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2006.11.091