Determination of σ(e+e–→ π+ π–) from radiative processes at DAΦNE

Aloisio, A.; Ambrosino, F.; Antonelli, A.; Antonelli, M.; Bacci, C.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocci, V.; Bossi, F.; Branchini, P.; Bulychjov, S. A.; Caloi, R.; Campana, P.; Capon, G.; Capussela, T.; Carboni, G.; Cataldi, G.; Ceradini, F.; Cervelli, F.; Cevenini, F.; Chiefari, G.; Ciambrone, P.; Conetti, S.; Lucia, E. De; Simone, P. De; Zorzi, G. De; Dell’Agnello, S.; Denig, A.; Domenico, A. Di; Donato, C. Di; Falco, S. Di; Micco, B. Di; Doria, A.; Dreucci, M.; Erriquez, O.; Farilla, A.; Felici, G.; Ferrari, A.; Ferrer, M. L.; Finocchiaro, G.; Forti, C.; Franceschi, A.; Franzini, P.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Gorini, E.; Graziani, E.; Incagli, M.; Kluge, W.; Kulikov, V.; Lacava, F.; Lanfranchi, G.; Lee‐Franzini, J.; Leone, D.; Lu, F.; Martemianov, M.; Matsyuk, M.; Mei, W.; Merola, L.; Messi, R.; Miscetti, S.; Moulson, M.; Müller, Steffen; Murtas, F.; Napolitano, M.; Nedosekin, A.; Nguyen, F.; Palutan, M.; Pasqualucci, E.; Passalacqua, L.; Passeri, A.; Patera, V.; Perfetto, F.; Petrolo, E.; Pontecorvo, L.; Primavera, M.; Ruggieri, F.; Santangelo, P.; Santovetti, E.; Saracino, G.; Schamberger, R. D.; Sciascia, B.; Sciubba, A.; Scuri, F.; Sfiligoi, I.; Sibidanov, A.; Spadaro, T.; Spiriti, E.; Testa, M.; Tortora, L.; Valente, P.; Valeriani, B.; Venanzoni, G.; Veneziano, S.; Ventura, A.; Ventura, Silvia Mastrolembo; Versaci, R.; Villella, I.; Xu, G.

doi:10.1140/epjcd/s2004-03-1613-4

Cited by 5 publications

(50 citation statements)

References 9 publications

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“…Their production and decay pattern when recoiling against an or meson is a key witness of their anomalous structure. (6) Last not least, the at ∼ 500 MeV/c 2 , called (485) in this report, and mesons at ∼ 700 MeV/c 2 called (700) seem to be firmly established, not only because of new data but also due to substantial advances in the theoretical description of low-energy (and K ) interactions. Both particles are now understood as consequence of chiral symmetry and unitarity, constraints which can both be met only when these two particles are introduced.…”

Section: Recent Outstanding Achievementsmentioning

confidence: 71%

“…The (485) mass is 200 MeV/c 2 above the threshold. Current views mostly assume the (485) to be a effect, unrelated to qq spectroscopy. The continuous transition from b0 (1P ) to the (485) does of course not imply similar wave functions for these two mesons.…”

Section: New Insightsmentioning

confidence: 97%

“…. , M f 0 (980) − M KK , M (485) − M ) is a smooth function of the mass of the decay products (see Fig. 119a in Section 11.6.3).…”

Section: New Insightsmentioning

confidence: 99%

“…The b0 (1P ) has a mass 700 MeV/c 2 below the threshold for BB decays. It connects via c0 (1P ), via D * s0 (2317), via a postulated D * 0 (1980), via f 0 (980) and (700) to the (485). The (485) mass is 200 MeV/c 2 above the threshold.…”

Section: New Insightsmentioning

confidence: 99%

“…It connects via c0 (1P ), via D * s0 (2317), via a postulated D * 0 (1980), via f 0 (980) and (700) to the (485). The (485) mass is 200 MeV/c 2 above the threshold. Current views mostly assume the (485) to be a effect, unrelated to qq spectroscopy.…”

Section: New Insightsmentioning

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: Recent Outstanding Achievementsmentioning

confidence: 71%

Section: New Insightsmentioning

confidence: 97%

“…. , M f 0 (980) − M KK , M (485) − M ) is a smooth function of the mass of the decay products (see Fig. 119a in Section 11.6.3).…”

Section: New Insightsmentioning

confidence: 99%

Section: New Insightsmentioning

confidence: 99%

Section: New Insightsmentioning

confidence: 99%

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Glueballs, hybrids, multiquarks

2007

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Hadronic Vacuum Polarization

Melnikov

Vainshtein

Springer Tracts in Modern Physics

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Results from KLOE at DAΦNE

Bloise¹

2004

AIP Conference Proceedings

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The KLOE experiment at the Frascati φ factory, DaΦne, has collected 500 pb 1 , i.e. 1.5¢ 10 9 φ decays. At the φ factory it is possible to select pure K L and K S beams. Although the integrated luminosity is insufficient for precision tests of the CP, T symmetries in kaon decays, a wide number of topics in kaon and hadronic physics are accessible from the largest sample of Φ decays at rest collected so far. The cross section σ´e · e π · π γµ below 1 GeV, relevant for the precise evaluation of the muon magnetic moment, has been measured with a statistical accuracy better than 1%. For the K S , we obtained the ratio of the branching fractions Γ´K S π · π ´γ µµ Γ´K S π 0 π 0 µ 2 239 ¦ 0 003 stat ¦ 0 015 syst µ, fully inclusive of the ππγ final state. The analysis of the 20,000 K S semileptonic decays K S πeν is being finalized providing precise measurements of both, the K S semileptonic branching ratio, and Re x · , i.e. the ∆S = ∆Q rule violation parameter. For the K L , we obtained the ratio Γ´K L γγµ Γ´K L π 0 π 0 π 0 µ 2 80 ¦0 02 stat ¦0 02 syst µ ¢10 3 , of interest to Chiral Perturbation Theory (ChPT), as well as preliminary results on the branching ratios to other decay modes. In particular, our measurements of the semileptonic decays of both, neutral, and charged kaons will improve the precision of the CKM matrix element V us , clarifying the present disagreement between different experiments. The φ radiative decays, both in scalar and pseudo-scalar mesons, have been analyzed giving new measurements of the η η ¼ mixing angle, and of the φ a 0´9 80µγ, φ f 0´9 80µγ branching ratios.KLOE began to take data for physics in year 2000. Since the first data taking campaign the machine luminosity increased countinously (Fig. 1) together with the data quality, and in year 2002 DaΦne has reached a peak luminosity of 8 ¢10 31 cm 2 s 1 , delivering to KLOE 4.2 pb 1 per day. The total integrated luminosity is at present 500 pb 1 , corresponding to a sample of 1.3¢ 10 9 kaon pairs produced in a pure J PC = 1 quantum state.

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Determination of σ(e+e–→ π+ π–) from radiative processes at DAΦNE

Cited by 5 publications

References 9 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

Hadronic Vacuum Polarization

Results from KLOE at DAΦNE

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