منابع مشابه
QCD Finite Energy Sum Rules and the Isoscalar Scalar Mesons
We apply QCD Finite Energy Sum Rules to the scalar-isoscalar current to determine the lightest uu+ dd meson in this channel. We use ‘pinch-weights’ to improve the reliability of the QCD predictions and reduce the sensitivity to the cut-off s0. A decaying exponential is included in the weight function to allow us to focus on the contribution from low mass states to the phenomenological integral....
متن کاملLight Scalar Mesons
We review how a certain effective chiral Lagrangian approach to ππ scattering, πK scattering and η → ηππ decay provides evidence for the existence of light scalars σ(550) and κ(900) as well as describing the f0(980) and the a0(980). An attempt to fit these into a nonet suggests that their structure is closer to a dual quark–dual antiquark than to a quark–antiquark. A possible mechanism to expla...
متن کامل1 Light Scalar Mesons ∗
The crucial points of physics of light scalar mesons are discussed. The special attention is given to the chiral shielding of lightest scalar mesons and the production of the well established light scalar mesons in the φ radiative decays. Arguments in favor of the four-quark model of the a 0 (980) and f 0 (980) mesons are given. To discuss actually the nature of the putative nonet of the light ...
متن کاملPhenomenology of Scalar Mesons
A separable potential model of three coupled channels ππ, KK and an effective 2π2π has been constructed and applied in the analysis of the isoscalar S-wave ππ and KK phase shifts and inelasticities. A relatively narrow scalar resonance of mass 1400-1460 MeV has been found. This resonance is consistent with the recent CERN observation of an eventual scalar glueball at 1500 MeV. Other resonances ...
متن کاملHolographic scalar mesons
Many approaches and techniques have been developed to understand QCD in its nonperturbative regime, but, up to now, no one has been completely satisfactory, leaving strongly coupled theories still a mystery. Recently, the possibility to apply AdS/CFT correspondence [1, 2] methods to (the large N limit of) strongly coupled gauge theories has been pointed out. This direction, known as AdS/QCD [4]...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2011
ISSN: 1029-8479
DOI: 10.1007/jhep01(2011)019