Study of resonance production in diffractive reaction π−A → π+π−π−A

Amelin, D.V.; Berdnikov, E. B.; Bityukov, S.I.; Borisov, G.; Gouz, Yu.; Dorofeev, V.; Dzhelyadin, R.; Kachaev, I.; Karyukhin, A.N.; Khokhlov, Yu.A.; Klyuchnikov, G. A.; Константинов, В.Ф.; Kopikov, S. V.; Kostrikov, M.E.; Kostyukhin, V. V.; Matveev, V.; Ostankov, A.; Ryabchikov, D.I.; Solodkov, A. A.; Solovianov, O.; Starchenko, E. A.; Vishnevsky, N.K.; Vlasov, E.; Zaǐtsev, A. M.; Sehniaidze, G; Tskhadadze, E. G.

doi:10.1016/0370-2693(95)00864-h

Cited by 60 publications

(46 citation statements)

References 11 publications

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“…A first signal was observed by the ACCMOR collaboration [220] in the reaction − p → + − − p. A resonance-like signal was reported in the 2 − D + 0 (f 2 ) wave. The signal itself was confirmed by VES [240]. However, the signal could be described as well by interference of 2 (1680) with a broad state 2 (2100).…”

Section: J P C = 2 −+mentioning

confidence: 82%

“…Most data were collected with a trigger on two or more charged particles in forward direction and a veto on high-momentum charged particles in side direction. The results on meson spectroscopy are published in [232][233][234][235][236][237][238][239][240][241][242][243][244][245][246][247][248][249][250].…”

Section: The Ves Experimentsmentioning

confidence: 98%

“…It was studied by two experiments in diffractivelike reactions: by the VES collaboration [240,249] at p = 37 GeV/c and by the E-852 collaboration at p = 18 GeV/c [253,261]. A new BNL data sample with 10-fold increased statistics was reported in [267].…”

Section: Partial Wave Analyses Of the Diffractively Produced + − − Symentioning

confidence: 98%

“…Experiments exhibit a strong J P C = 1 ++ signal at M ≈ 1.7 GeV/c 2 in [240,261], f 1 [929,265] and [242]. The shapes of these signals are different, the visible width varies from ≈ 300 MeV/c 2 in the channel to ≈ 600 MeV/c 2 in .…”

Section: J P C = 1 ++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: J P C = 2 −+mentioning

confidence: 82%

Section: The Ves Experimentsmentioning

confidence: 98%

Section: Partial Wave Analyses Of the Diffractively Produced + − − Symentioning

confidence: 98%

Section: J P C = 1 ++mentioning

confidence: 99%

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Glueballs, hybrids, multiquarks

2007

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“…Now it is believed that there exist two states with these quantum numbers below 2 GeV: π 1 (1400) [2,3] and π 1 (1600) [4,5](note, a recent analysis [6] finds no evidence for either candidate). There are also other reported hybrid candidates with J P C = 0 −+ [7,8], 1 −− [9] and 2 −+ [10,11,12]. Theoretically, the structure of the π 1 states remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Coulomb gauge approach to qq̄g hybrid mesons

2007

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An effective Coulomb gauge Hamiltonian, H eff , is used to calculate the light (uūg), strange (ssg) and charmed (ccg) hybrid meson spectra. For the same two parameter H eff providing glueball masses consistent with lattice results and a good description of the observed u, d, s and c quark mesons, a large-scale variational treatment predicts the lightest hybrid has J P C = 0 ++ and mass 2100 MeV. The lightest exotic 1 −+ state is just above 2200 MeV, near the upper limit of lattice and Flux Tube predictions. These theoretical formulations all indicate the observed 1 −+ π1(1600) and, more clearly, π1(1400) are not hybrid states. The Coulomb gauge approach further predicts that in the strange and charmed sectors, respectively, the ground state hybrids have 1 +− with masses 2125 and 3830 MeV, while the first exotic 1 −+ states are at 2395 and 4020 MeV. Finally, using our hybrid wavefunctions, dimensional counting rules and the Franck-Condon principle, novel experimental signatures are presented to assist light and heavy hybrid meson searches.

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Physics of 0−, 1+ and 2− Mesons

Palano¹

1996

Hadron Spectroscopy and the Confinement Problem

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Study of resonance production in diffractive reaction π−A → π+π−π−A

Cited by 60 publications

References 11 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Coulomb gauge approach to qq̄g hybrid mesons

Physics of 0−, 1+ and 2− Mesons

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