Further study of the E-meson in antiproton-proton annihilations at rest

Baillon, P.; Edwards, David; Maréchal, B.; Montanet, L.; Tomás, Manuel Pruñonosa; D'Andlau, Ch.; Astier, A.; Cohen-Ganouna, J.; Della-Negra, M.; Wojcicki, S. G.; Baubillier, M.; Duboc, J.; James, F.; Lévy, F.

doi:10.1007/bf02823526

Cited by 148 publications

(25 citation statements)

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“…In the same year, a second meson was discovered which is now called f 1 (1420). It has nearly the same mass as the E meson and was called E, too, since the quantum numbers in [73] were believed to be possibly wrong (see, however, [74]). Now we know that the state produced in pp annihilation has pseudoscalar quantum numbers.…”

Section: A Guide To the Literaturementioning

confidence: 97%

“…It was found in pp annihilation at rest and was the first meson discovered in Europe. People at CERN were obviously very cautious not to present a wrong result, only two years later the E meson was reported in a journal publication [73]. A detailed study was presented which included several final states and a full partial wave analysis yielding pseudoscalar quantum numbers.…”

Section: A Guide To the Literaturementioning

confidence: 98%

“…Mass, width and quantum numbers were determined to be M = 1425 ± 7, = 80 ± 10 MeV/c 2 , and J P C = 0 −+ [73]. In parallel, a further resonance was found in the charge exchange reaction − p → nKK , using a 1.5 to 4.2 GeV/c pion beam [995].…”

Section: The (1440)mentioning

confidence: 99%

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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: A Guide To the Literaturementioning

confidence: 97%

Section: A Guide To the Literaturementioning

confidence: 98%

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Glueballs, hybrids, multiquarks

2007

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“…The state η(1440) (old name is E(1407) [4]) attracts our special attention: it is considered during long time as a state with possible rich gluonic component.…”

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confidence: 99%

Partial widths for the decays η:(1295) →γγ and η:(1440) →γγ

Anisovich

Nikonov

et al. 1999

Eur. Phys. J. A

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We discuss γγ partial widths of pseudoscalar/isoscalar mesons η(M ) in the mass region M ∼ 1000 − 1500 MeV. The transition amplitudes η(1295) → γγ and η(1440) → γγ are studied within an assumption that the decaying mesons are the members of the first radial excitation nonet 2 1 S0qq. The calculations show that partial widths being of the order of 0.1 keV are dominantly due to the nn meson component while the contribution of the ss component is small.14.40. Aq, 13.40.Fn, 13.40.Hq

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“…The results indicate that both ηð1475Þ and Xð1835Þ contain a sizeable ss component. A puzzling state, the ηð1440Þ, was first observed in pp annihilation at rest into ηð1440Þπ þ π − ðηð1440Þ → KKπ) [1], and later in J/ψ radiative decays to KKπ [2], γρ [3] and f 0 ð980Þπ 0 [4]. Further studies by different experiments reported evidence for the existence of two pseudoscalar mesons in this region, the ηð1405Þ and the ηð1475Þ [5].…”

mentioning

confidence: 99%

Study of η(1475) and X(1835) in radiative
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2018
Phys. Rev. D

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Further study of the E-meson in antiproton-proton annihilations at rest

Cited by 148 publications

References 7 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Partial widths for the decays η:(1295) →γγ and η:(1440) →γγ

Study of η(1475) and X(1835) in radiative
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2018
Phys. Rev. D

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Further study of the E-meson in antiproton-proton annihilations at rest

Cited by 148 publications

References 7 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Partial widths for the decays η:(1295) →γγ and η:(1440) →γγ

Study of η(1475) and X(1835) in radiative Ablikim1, Ачасов2, Ahmed3 et al. 2018Phys. Rev. D

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Study of η(1475) and X(1835) in radiative
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2018
Phys. Rev. D