Analysis of the reaction π−p → π0ηn at 40 GeV/c beam momentum

Apel, W. D.; Augenstein, K.H.; Bertolucci, E.; Donskov, S.V.; Inyakin, A.V.; Kachanov, V.A.; Khalek, F.Abdel; Krasnokutsky, R.N.; Krüger, M.; Leder, G.; Lednev, A.A.; Mannelli, I.; Mikhailov, Yu.V.; Müller, H.; Pierazzini, G.; Prokoshkin, Yu.D.; Quaglia, M.; Schneider, H.; Sergiampietri, F.; Shuvalov, R.S.; Sigurdsson, G.; Vincelli, M.L.

doi:10.1016/0550-3213(81)90334-5

Cited by 30 publications

(3 citation statements)

References 9 publications

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“…After a very early first observation of an J P C = 1 −+ exotic wave in 1981 [964], high statistics data became available from VES and KEK in 1993 [235,965]. 4 In the VES experiment, events due to the exclusive reactions − Be → XBe (where X means the aforementioned decay channels) at p = 37 GeV/c were selected and subjected to a partial wave analysis (PWA).…”

Section: The Wave J P C = 1 −+ In the Channelmentioning

confidence: 99%

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: The Wave J P C = 1 −+ In the Channelmentioning

confidence: 99%

Glueballs, hybrids, multiquarks

2007

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“…In total 140 × 10 3 events of reaction (1) were collected. Further details of the experiment as well as the data treatment procedures can be found elsewhere [2,3].…”

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confidence: 99%

“…In the a 2 (1310) meson production the natural spin-parity exchanges (mainly ρ-exchange) dominate in the t-channel of the reaction [3], that leads to a suppression of the a 2 production at t ∼ 0 [5]. As for the a 0 (980) meson production the only unnatural exchanges are allowed in the t-channel.…”

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confidence: 99%

Study of the ηπ[sup 0] system in the mass range up to 1200 MeV

Alde¹,

Binon²,

Bricman³

et al. 1998

AIP Conference Proceedings

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The reaction π − p → ηπ o n has been studied with GAMS-2000 spectrometer in the secondary 38 GeV/c π − -beam of the IHEP U-70 accelerator. Partial wave analysis of the reaction has been performed in the ηπ o mass range up to 1200 MeV. The a 0 (980)-meson is seen as a sharp peak in S-wave. The t-dependence of a 0 (980) production cross section has been studied. Dominant production of the a 0 (980) at a small transfer momentum t confirms the hypothesis of Achasov and Shestakov about significant contribution of the ρ 2 exchange (I G J P C = 1 + 2 −− ) in the mechanism of a 0 (980) meson production in t-channel of the reaction.

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Schwerionentherapie bei der GSI: Erste Patienten behandelt !/„Existenzgründer aus Hochschulen”︁/Überkapazität an weicher Röntgenstrahlung?/Großbritannien: Ein „Wegeplan”︁ für die Teilchen‐ und Astrophysik/Luciano Maiani CERN‐Generaldirektor ab 1999/Blick nach Frankreich und in die Schweiz/Blick in die USA/„Tag der Physik 1997”︁ an der Uni Kaiserslautern/TeV‐Energien mit Myonen?/Die Top Ten der Physik/Teleportation: Fernübertragung à la Quantenmechanik/Experimenteller Nachweis exotischer Mesonen?/Mag

Kraft

Bradshaw²,

Redfearn³

et al. 1998

Phys. Bl.

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Analysis of the reaction π−p → π0ηn at 40 GeV/c beam momentum

Cited by 30 publications

References 9 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Study of the ηπ[sup 0] system in the mass range up to 1200 MeV

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