Study of the πpi-system with the GAMS-4000 spectrometer at 100 GeV/c

Alde, D.; Binon, Freddy; Bricman, C.; Donskov, S.V.; Gouanère, M.; Inyakin, A.V.; Inaba, S.; Kachanov, V.A.; Khaustov, G.V.; Knapp, E.A.; Кондашов, А. А.; Lednev, A.A.; Lishin, V.; Peigneux, Jean Pierre; Poulet, M.; Prokoshkin, Yu.D.; Sadovsky, S.; Samoylenko, V.D.; Shagin, P.; Singovsky, A.V.; Stroot, Jean-Pierre; Sugonyaev, V.P.; Takamatsu, K.; Tsuru, T.

doi:10.1007/s100500050190

Cited by 39 publications

(23 citation statements)

References 9 publications

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“…It turns out that only the 'down-flat' is compatible with Roy's equations and satisfies crossing symmetry [1056]. The 'down-flat' solution is also compatible [1057] with the BNL [257] and GAMS results [294] which we discuss further down.…”

Section: Scatteringmentioning

confidence: 67%

“…Fig. 83 shows the modulus of the S-wave amplitude [294]. A series of peaks and dips is observed and it is not straightforward to identify the scalar resonances.…”

Section: Other Interpretationsmentioning

confidence: 96%

“…A 100 GeV photon was measured with a precision of about 1.5 GeV in energy; the impact point was localised to 1 mm 2 . Results from GAMS can be found in [285][286][287][288][289][290][291][292][293][294][295][296].…”

Section: The Gams Experimentsmentioning

confidence: 99%

“…The solutions in adjacent mass bins were required to be analytical function of mass [294]. Under favourable circumstances, the linking procedure leads to eight global solutions.…”

Section: Scalar Resonances From Central Productionmentioning

confidence: 99%

“…The reaction − p → p 0 0 at 100 GeV/c for |t| < 0.2 GeV 2[294]. Open circles represent data taken at 38 GeV.…”

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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: Scatteringmentioning

confidence: 67%

“…Fig. 83 shows the modulus of the S-wave amplitude [294]. A series of peaks and dips is observed and it is not straightforward to identify the scalar resonances.…”

Section: Other Interpretationsmentioning

confidence: 96%

Section: The Gams Experimentsmentioning

confidence: 99%

“…The solutions in adjacent mass bins were required to be analytical function of mass [294]. Under favourable circumstances, the linking procedure leads to eight global solutions.…”

Section: Scalar Resonances From Central Productionmentioning

confidence: 99%

“…The reaction − p → p 0 0 at 100 GeV/c for |t| < 0.2 GeV 2[294]. Open circles represent data taken at 38 GeV.…”

mentioning

confidence: 99%

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Glueballs, hybrids, multiquarks

2007

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Scalar mesons: in search of the lightest glueball

Ochs

2007

Nuclear Physics B - Proceedings Supplements

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According to the QCD expectations the lightest glueball should be a scalar particle (J^{PC}=0^{++}). Different scenarios have been considered for a classification of these states but -- despite considerable progress in recent years -- the experimental basis for various parameters is still rather weak. We present a new analysis of the elastic and charge exchange pi pi scattering between 1000 and 1800 MeV. A unique solution is selected which shows clear evidence for f_0(1500) and a broad state (\sigma or ``f_0(1000)''), but there is no evidence for f_0(1370) at a level of \gtrsim 10% branching ratio to pi pi. Arguments in favour of the broad state to be a glueball are summarized.Comment: talk presented at QCD06, Montpellier, France, July3-7, 200

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Light scalar mesons in QCD

Narison¹

2009

Nuclear Physics B - Proceedings Supplements

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Study of the πpi-system with the GAMS-4000 spectrometer at 100 GeV/c

Cited by 39 publications

References 9 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Scalar mesons: in search of the lightest glueball

Light scalar mesons in QCD

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