ar X iv : h ep - p h / 94 04 24 2 v 1 8 A pr 1 99 4 The ρ - Meson as a Collective Excitation ∗
نویسنده
چکیده
A model of the ρ-meson as a collective excitation of q ¯ q pairs in a system that obeys the modified Nambu–Jona-Lasinio Lagrangian is proposed. The ρ emerges as a dormant Goldstone boson. The origin of the ρ-meson mass is understood as a result of spontaneous chiral symmetry breaking. The low-energy dynamics of ρ, π, ω and γ is consistently described in this new framework. The model accounts for the origin of the celebrated Kawarabayashi–Suzuki–Riazuddin– Fayyazuddin relation.
منابع مشابه
ar X iv : h ep - p h / 04 03 25 8 v 1 2 4 M ar 2 00 4 ρ - meson form factors and QCD sum rules
ρ-meson form factors and QCD sum rules. Abstract We present predictions for ρ-meson form factors obtained from the analysis of QCD sum rules in next-to-leading order of perturbation theory. The radiative corrections turn out to be sizeable and should be taken into account in rigorous theoretical analysis.
متن کاملar X iv : h ep - p h / 99 04 25 4 v 1 7 A pr 1 99 9 TWO - PHOTON PRODUCTION OF FOUR - QUARK STATES UP TO THE J / ψ ENERGY ∗
Evidence for an explicitly exotic state with isospin 2 and spin-parity 2 + near the ρρ threshold and nontrivial complementary indications of the unusual quark composition of the f0(980) and a0(980) states obtained from the reactions of two-photon formation of neutral meson resonances are discussed, together with puzzling phenomena in the channels γγ → ρ 0 φ and γγ → ρ 0 ρ 0 at high energies.
متن کاملar X iv : h ep - p h / 94 04 26 5 v 1 1 3 A pr 1 99 4 POSSIBLE EXTENSION OF THE CHIRAL PERTURBATION THEORY PROGRAM
After a brief discussion of how chiral dynamics has evolved from the " universal V-A theory of weak interactions " , we present some evidence that symmetry breaking for the vector meson multiplet is not simpler than but rather analogous to that for the pseudoscalar multiplet. This provides a motivation for speculating on how to extend in a systematic way the chiral perturbation theory program t...
متن کاملar X iv : h ep - p h / 04 01 03 7 v 1 8 J an 2 00 4 Large Nc Behavior of Light Scalar Meson Nonet
We study whether light scalar meson nonet can survive in large values of Nc through observing how scattering amplitudes behave as Nc increases from 3 within a unitarized chiral approach. We obtain the result that vector mesons such as ρ and K∗ survive as narrow width resonances, but all of the scalar meson nonet below 1 GeV fade out as Nc exceeds a rather small number about 6.
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