Nonet symmetry, anomalous Ward identities and meson-gluonium mixing
01 Mar 1987-European Physical Journal C (Springer Science and Business Media LLC)-Vol. 37, Iss: 1, pp 69-76
TL;DR: In this article, the SU(3) flavour structure of ι(1460) is exploited to seek consistency between vector meson dominance and anomalous Ward identities, and it is shown that a minimum of 10 to 20% breaking in nonet symmetry is necessary to get an overall fit with the radiative rates of low-lying η and η′.
Abstract: TheSU(3) flavour structure of ι(1460) is exploited to seek consistency between vector meson dominance and anomalous Ward identities. Our analysis shows that a minimum of 10 to 20% breaking in nonet symmetry is necessary to get an overall fit with the radiative rates of low-lying η and η′.
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TL;DR: In this article, the phenomenology of the pseudoscalar η(1440) meson (also known as l) is discussed in a simplified η, η′ l mixing scheme in which the η is assumed to have no glueball component.
Abstract: The phenomenology of the pseudoscalar η(1440) meson (also known as l) is discussed in a simplified η, η′ l mixing scheme in which the η is assumed to have no glueball component. The parameters of the model are quite well constrained from the η and η′ two-photon decays. First it is shown that the scheme is in rather good general agreement with (almost) all the available data. Then a number of testable predictions concerning decays involving the iota are made. The iota turns out to be largely a glueball in this model.
5 citations
01 Jun 1997
TL;DR: Despite the prolonged experimental effort devoted to the spectroscopy of the E/t mesons, and the intense theoretical debate around this subject, many puzzling issues still prevent from a full understanding of the true scenario as discussed by the authors.
Abstract: Despite the prolonged experimental effort devoted to the spectroscopy of the E/t mesons, and the intense theoretical debate around this subject, many puzzling issues still prevent from a full understanding of the true scenario. The advent of new and more precise experimental measurements motivates a review on this topic.
1 citations
TL;DR: In this article, the authors generalized the Pisarsky-Wilczek model of studying the UA(1) phase transition in π0, η and η′ system by incorporating the chiral phase transition.
Abstract: We have generalized the Pisarsky–Wilczek model of studying the UA(1) phase transition in π0, η and η′ system by incorporating the chiral phase transition. The mass-squared matrix of the neutral pseudoscalar mesons is revisited explicitly from the chiral effective action which necessitates the mixing among the unmixed states to get the physical states. The derivation of the mass spectra of the neutral pseudoscalar mesons shows that apart from their masses, the mixing angles also become temperature dependent. Based on the dilute instanton gas approximation we show that, the UA(1) phase transition along with the chiral phase transition plays an important role in the process of hadronization of the quark–gluon plasma with the quarks of three flavors.
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TL;DR: In this article, the authors used radiative transitions involving neutral mesons with J/sup P/ = 0/sup -/ (eta,eta,iota(1440)) and 2/sup +/ (f,f,theta(1640)) to provide information on the light-quark content of these mesons, and to test predictions of models in which these states are quarkonium-gluonium mixtures.
Abstract: Radiative transitions involving neutral mesons with J/sup P/ = 0/sup -/ (eta,eta',iota(1440)) and 2/sup +/ (f,f',theta(1640)) are used to provide information on the light-quark content of these mesons, and to test predictions of models in which these states are quarkonium-gluonium mixtures. Some suggested observations include (l) phi..-->..eta'..gamma.., predicted to have a branching ratio of 7 x 10/sup -5/ in the standard quarkonium picture of eta', (2) f'..--> gamma gamma.., predicted to have a partial width > or approx. =200 eV if f' = ss-bar but very sensitive to possible destructive interference from small nonstrange-quark admixtures, and (3) iota(1440)..--> gamma gamma.. and theta(1640)..--> gamma gamma.., which will be easily detectable unless these states are almost totally free of quarkonium admixtures.
101 citations
TL;DR: Nonet-symmetry breaking and pseudoscalar-meson mixing are discussed using recent measurements of J/psi..-->..vector+pseudoscalar branching ratios by the Mark III collaboration.
Abstract: Implications of broken flavor-SU(3) symmetry are studied for J/psi and eta/sub c/ decays to two- and three-meson final states. Nonet-symmetry breaking and pseudoscalar-meson mixing are discussed using recent measurements of J/psi..-->..vector+pseudoscalar branching ratios by the Mark III collaboration. Detailed fits are presented to determine phenomenological parameters which describe the various mesonic decays of the J/psi. We conclude that the eta and eta' can be mixed with iota(1440), and predict B(J/psi..-->..iota..omega..) = (0.75 +- 0.12) x 10 -3 and B(J/psi..-->..iotaphi) = (0.09 +- 0.02) x 10 -3. In J/psi ..-->..pseudoscalar+pseudoscalar decays, electromagnetic and mass-breaking effects are found to be of similar importance. Different SU(3)-breaking patterns are observed in J/psi..-->..PV and eta/sub c/..-->..VV decays.
57 citations
TL;DR: In this paper, the off-diagonal two-point correlation function responsible for the gluonium-meson mixing was evaluated, including the leading nonperturbative lowest dimension vacuum condensate contributions.
33 citations
TL;DR: In this paper, a mixing scheme among three pseudoscalar mesons η, η′ and τ(1440) is proposed in order to analyze their\(q\bar q\) and gluonic components.
Abstract: A mixing scheme among three pseudoscalar mesons η, η′ and τ(1440) is proposed in order to analyze their\(q\bar q\) and gluonic components. Inequalities follow from requiring the consistency of the scheme and the range permitted for the mass of the pure gluonic state (glueball) turns out to be rather small. The resulting picture is in good agreement with the overall phenomenology and with the (rather scarce) data on the subject.
13 citations
TL;DR: In this paper, the relationships between the iota(1460) partial widths to γγ, ργ and ωγ were derived and the SU(3) flavor structure of iota decays.
10 citations