4π decay modes of the f0(1500) resonance

Strohmeier-Prešiček, M.; Gutsche, Th.; Faessler, Amand; Mau, R. Vinh

doi:10.1016/s0370-2693(98)01044-2

Cited by 12 publications

(16 citation statements)

References 16 publications

(28 reference statements)

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“…De-Min Li et al studied the influence of the position of the primordial glueball mass on the mixing parameters [1179]. Crystal Barrel results on 4 decays of scalar mesons were included in the analysis by Fässler and collaborators [1180,1181]. In this analysis, slightly more than 50% of the f 0 (1500) wave function is of gluonic nature, the f 0 (1710) comprises 32% and the f 0 (1370) 12% of glue.…”

Section: Glueball-qq Mixing Scenariosmentioning

confidence: 98%

Glueballs, hybrids, multiquarks

2007

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Glueballs, hybrids and multiquark states are predicted as bound states in models guided by quantum chromo dynamics (QCD), by QCD sum rules or QCD on a lattice. Estimates for the (scalar) glueball ground state are in the mass range from 1000 to 1800 MeV, followed by a tensor and a pseudoscalar glueball at higher mass. Experiments have reported evidence for an abundance of meson resonances with 0 −+ , 0 ++ and 2 ++ quantum numbers. In particular, the sector of scalar mesons is full of surprises starting from the elusive and mesons. The a 0 (980) and f 0 (980), discussed extensively in the literature, are reviewed with emphasis on their Janus-like appearance as KK molecules, tetraquark states or qq mesons. Most exciting is the possibility that the three mesons f 0 (1370), f 0 (1500), and f 0 (1710) might reflect the appearance of a scalar glueball in the world of quarkonia. However, the existence of f 0 (1370) is not beyond doubt and there is evidence that both f 0 (1500) and f 0 (1710) are flavour octet states, possibly in a tetraquark composition. We suggest a scheme in which the scalar glueball is dissolved into the wide background into which all scalar flavour-singlet mesons collapse.There is an abundance of meson resonances with the quantum numbers of the . Three states are reported below 1.5 GeV/c 2 whereas quark models expect only one, perhaps two. One of these states, (1440), was the prime glueball candidate for a long time. We show that (1440) is the first radial excitation of the meson.Hybrids may have exotic quantum numbers which are not accessible by qq mesons. There are several claims for J P C = 1 −+ exotics, some of them with properties as predicted from the flux tube model interpreting the quark-antiquark binding by a gluon string. The evidence for these states depends partly on the assumption that meson-meson interactions are dominated by s-channel resonances. Hybrids with non-exotic quantum numbers should appear as additional states. Light-quark mesons exhibit a spectrum of (squared) masses which are proportional to the sum of orbital angular momentum and radial quantum numbers. Two states do not fall under this classification. They are discussed as hybrid candidates.The concept of multiquark states has received revived interest due to new resonances in the spectrum of states with open and hidden charm. The new states are surprisingly narrow and their masses and their decay modes often do not agree with simple quark-model expectations.Lattice gauge theories have made strong claims that glueballs and hybrids should appear in the meson spectrum. However, the existence of a scalar glueball, at least with a reasonable width, is highly questionable. It is possible that hybrids will turn up in complex multibody final states even though so far, no convincing case has been made for them by experimental data. Lattice gauge theories fail to identify the nonet of scalar mesons. Thus, at the present status of approximations, lattice gauge theories seem not to provide a trustworthy guide into unknown territory ...

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Section: Glueball-qq Mixing Scenariosmentioning

confidence: 98%

Glueballs, hybrids, multiquarks

2007

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“…Neglecting a possible G 0 component in σ, the leading order decay mechanism predicts [13] the hierarchy of branching ratios BR with BR(ρρ) > ∼ BR(ππ) > ∼ BR(σσ) > BR(π * (1300)π), independent of any particular three-state mixing scheme. The results are in strong conflict with current Crystal Barrel data, where the ρρ decay mode of the f 0 (1500) is weak or even absent [15] and a stronger coupling to the 4π modes than to the 2π decay channel [8] is required.…”

Section: Introductionmentioning

confidence: 97%

“…This mechanism occurs in the leading of strong coupling QCD [4] by the transition G 0 → G 0 G 0 , which can produce final states with isoscalar mesons (ηη, ηη ′ and σσ, where σ is the broad low lying This next-to-leading order transition can contribute to all two-body decay modes of the mixed f 0 states. An investigation [13] of the two-body decay modes σσ, ρρ and π * (1300)π of the f 0 (1500), all leading to the 4π decay channel, indicates the possible presence of a sizable direct coupling of the gluonic component of the f 0 (1500) to the 4π decay channels.…”

Section: Introductionmentioning

confidence: 99%

Glueball-quarkonia content and decay of scalar-isoscalar mesons

et al. 1999

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We investigate the hadronic two-body decay modes of the scalar-isoscalar f 0 (1370), f 0 (1500) and f 0 (1710) states as resulting from the mixture of the lowest lying scalar glueball with the isoscalar states of the ground state 3 P 0 QQ nonet. In the decay analysis we take into account the direct coupling of the quarkonia and glueball components of the f 0 states to the quarkonia components of the two-meson final state with the decay dynamics inspired by the strong coupling limit of QCD. We calculate partial decay widths for the f 0 states in the proposed three-state mixing schemes and discuss their compatibility with the observed decay features. Finally, we determine the glueball-quarkonia content of the f 0 states from a detailed fit to experimental decay data of f 0 (1500) and give predictions for the partial decay widths of f 0 (1370) and f 0 (1710), providing thus a sensitive test of the proposed mixing scheme.

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“…The idea that a glueball configuration is present in the scalar meson spectrum was suggested in [1] and later extensively used as for example in Refs. [2][3][4][5][6]. The discussion on possible evidence for the scalar ground state glueball has dominantly centered on the scalar-isoscalar resonances f 0 (1500) and f 0 (1710).…”

Section: Introductionmentioning

confidence: 99%

“…Thereby several analyses conclude that the three scalar states f 0 (1370), f 0 (1500) and f 0 (1710) result from a mixing of the glueball with the nn = 1/2 (uū + dd) and ss states of the scalar 3 P 0 quarkonium nonet. Furthermore, the nonappearance or the strength of the appearance of these scalar states in γγ or in central pp collisions have been argued to give further signals for a possible quantification of the glueball component residing in the scalars [2][3][4][5][6]. A study of the strong and radiative three-body decays of J/ψ with J/ψ → V + P P (γγ) and J/ψ → γ + P P (V V ), where V and P are vector and pseudoscalar mesons, opens a further opportunity to test the nature of the scalar mesons f 0 (1370), f 0 (1500) and f 0 (1710).…”

Section: Introductionmentioning

confidence: 99%