Study off o (995) resonance in the ?0?0 decay channel

Alde, D.; Binon, Freddy; Boutemeur, M.; Bricman, C.; Donskov, Sergey; Gouanère, M.; Inyakin, Alexandre A.V.; Kachanov, Vasilij V.A.; Khaustov, G.V.; Knapp, Edward E.A.; Кондашов, А. А.; Kulik, Alexei A.V.; Landsberg, G.; Lednev, A.A.; Lishin, V.; Peigneux, Jean Pierre; Polovnikov, Sergey S.A.; Polyakov, V.A.; Poulet, M.; Prokoshkin, Yu Y.D.; Sadovsky, Sergey S.A.; Samoylenko, V.D.; Shagin, Petr P.M.; Shtannikov, A.V. A.V.; Singovsky, Alexandre A.V.; Stroot, Jean-Pierre; Sugonyaev, V.P.

doi:10.1007/bf01556362

Cited by 47 publications

(5 citation statements)

References 9 publications

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“…92. The reaction − p → 0 0 n as a function of the momentum transfer to the system [290]. Table 31 Yield of light mesons per hadronic Z 0 decays as a function of the mesonic mass [1094,1123] No difference is observed in any of these comparisons between f 0 (980) and f 2 (1270) or (1020).…”

Section: Scalar Mesons In Fragmentationmentioning

confidence: 93%

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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: Scalar Mesons In Fragmentationmentioning

confidence: 93%

“…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%

Glueballs, hybrids, multiquarks

2007

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“…[9 ë 11], ÃÂÊËÓÑÄÂÎËÔß ÐÂ AEÂÐÐÞØ ÔÎÇAEÖáÜËØ ÅÓÖÒÒ: 1) AEÂÐÐÞÇ GAMS ÒÑ ÒÂpÐÑÏÖ pÑÉAEÇÐËá ÏÇÊÑÐÑÄ Ä S-ÄÑÎÐÇ Ä pÇÂÍÙËâØ pp 3 p 0 p 0 n, ZZn, ZZ H n ÒpË ÏÂÎÞØ ÍÄÂAEpÂÕÂØ ËÏÒÖÎßÔÂ, ÒÇpÇAEÂÐÐÑÅÑ ÐÖÍÎÑÐÖ: jtj`0Y2 (¤à£/c) 2 [12,13]; 2) AEÂÐÐÞÇ GAMS ÒÑ pÑÉAEÇÐËá pp Ä S-ÄÑÎÐÇ Ä pÇÂÍÙËË pp 3 p 0 p 0 n ÒpË ÃÑÎßÛËØ ÍÄÂAEÓÂÕÂØ ËÏÒÖÎßÔÂ, ÒÇpÇAEÂÐ-ÐÑÅÑ ÐÖÍÎÑÐÖ: 0Y30`jtj`1Y0 (¤à£/c) 2 [17]; 9) AEÂÐÐÞÇ E852 ÒÑ pÑÉAEÇÐËá pp Ä S-ÄÑÎÐÇ Ä pÇÂÍÙËË p À p 3 p 0 p 0 n ÒpË ÍÄÂAEpÂÕÂØ ËÏÒÖÎßÔÂ, ÒÇpÇAEÂÐÐÑÅÑ ÐÖÍÎÑÐÖ, 0`jtj`1Y5 (¤à£/c) 2 [18]. ±Ñ ÔpÂÄÐÇÐËá Ô pÂÃÑÕÑÌ [9] ÂÐÂÎËÊ [8] ÄÍÎáÚÂÎ ÕÂÍÉÇ pÇÂÍÙËË p" p-ÂÐÐËÅËÎâÙËË Ä ÅÂÊÇ.…”

Section: £äçAeçðëçunclassified

“…¿ÍÔÒÇpËÏÇÐÕÂÎßÐÞÇ AEÂÐÐÞÇ ÍÑÎÎÂÃÑÓÂÙËË E852 ÒÑ pÇÂÍÙËË p À p 3 p 0 p 0 n ÒpË p lab 18 ¤à£/c [18] ÔÑÄÏÇÔÕÐÑ Ô AEÂÐÐÞÏË ÅpÖÒÒÞ GAMS ÒÑ pÇÂÍÙËË p À p 3 p 0 p 0 n ÒpË p lab 38 ¤à£/c [12] âÄÎâáÕÔâ ØÑpÑÛÇÌ ÑÔÐÑÄÑÌ AEÎâ ËÊÖÚÇÐËâ pÇÊÑÐÂÐÔÑÄ f 0 980 Ë f 0 1300, ÕÂÍ ÍÂÍ ÒpË ÃÑÎßÛËØ ÍÄÂAEÓÂÕÂØ ËÏÒÖÎßÔÂ, ÒÇpÇAEÂÐÐÑÅÑ ÐÖÍÎÑÐÖ jtj 9 0Y5À1Y5 ¤à£/c) 2 , pÑÉAEÇÐËÇ pÇÊÑÐÂÐÔÑÄ ÔÑÒpÑÄÑÉ-AEÂÇÕÔâ ÐÇÃÑÎßÛËÏ ×ÑÐÑÏ, ÚÕÑ ÒÑÊÄÑÎâÇÕ AEÑÔÕÂÕÑÚÐÑ ÐÂAEÇÉÐÑ ÑÒpÇAEÇÎËÕß ËØ ÏÂÔÔÞ Ë ÛËpËÐÞ. ¿ÕÑ ÑÔÑÃÇÐÐÑ ÄÂÉÐÑ AEÎâ ÓÇÊÑÐÂÐÔÂ f 0 1300.…”

Section: £äçAeçðëçunclassified

Systematics of quark antiquark states and scalar exotic mesons

Anisovich¹

2004

Usp. Fiz. Nauk

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“…In high-energy experiments, the f 0 meson is observed as a resonance in the system of two pions produced in the variety of hadro-production reactions [16][17][18][19] or in hadronic decays of heavier mesons [20][21][22] or the Z 0 boson [23,24]. These experiments study invariant masses of the created neutral ((π 0 π 0 ) [16,18,22] and charged (π + π − ) [17,[19][20][21]23]) pion pairs. Similarly, charged [25,26] and neutral a 0 [27] mesons were observed as a clear signal in an invariant mass spectrum of the ηπ system.…”

Section: Introductionmentioning

confidence: 99%

Upper limit for the cross-section of the overlapping scalar resonancesf₀(980) anda₀(980) produced in proton–proton collisions in the range of the reaction threshold

Moskal

Adam

Budzanowski

et al. 2003

J. Phys. G: Nucl. Part. Phys.

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Utilizing a missing mass technique we investigate the pp → ppX reaction scanning beam energies in the range permitting to create a mass close to that of the f 0 (980) and a 0 (980) scalar resonances, but still below the K + K − threshold where they decay dominantly into ππ and πη mesons, respectively. Prior to the data analysis we introduce a notion of the close to threshold total cross section for broad resonances. We estimated for the overlapping mesons a 0 and f 0 the total cross section to be smaller than 430 nb at excess energy of Q = 5 MeV. The experiment have been performed at the Cooler Synchrotron COSY using the COSY-11 facility.

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Study off o (995) resonance in the ?0?0 decay channel

Cited by 47 publications

References 9 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Systematics of quark antiquark states and scalar exotic mesons

Upper limit for the cross-section of the overlapping scalar resonancesf₀(980) anda₀(980) produced in proton–proton collisions in the range of the reaction threshold

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Study off o (995) resonance in the ?0?0 decay channel

Cited by 47 publications

References 9 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Systematics of quark  antiquark states and scalar exotic mesons

Upper limit for the cross-section of the overlapping scalar resonancesf0(980) anda0(980) produced in proton–proton collisions in the range of the reaction threshold

Contact Info

Product

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Systematics of quark antiquark states and scalar exotic mesons

Upper limit for the cross-section of the overlapping scalar resonancesf₀(980) anda₀(980) produced in proton–proton collisions in the range of the reaction threshold