Two-pion spectra for the reaction π− p → π0π0 n at a pion momentum of 38 GeV/c and combined analysis of GAMS, Crystal Barrel, and BNL data

Anisovich, V.V.; Кондашов, А. А.; Prokoshkin, Yu.D.; Sadovsky, S.; Sarantsev, A.

doi:10.1134/1.1307464

Cited by 28 publications

(148 citation statements)

References 22 publications

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“…In the paper [8], on the basis of experimental data of GAMS group, Crystal Barrel Collaboration and BNL group, the K-matrix solution has been found for the waves 00 ++ , 10 ++ , 02 ++ , 12 ++ over the range 450-1900 MeV. Also the masses and total widths of resonances have been determined for these waves.…”

Section: Scalarsmentioning

confidence: 99%

“…Below the mass scale of the K-matrix analysis [8] there is a pole related to the light σ-meson (or f 0 (450)); its position is shown in Fig. 3 following the results of the dispersion relation N/D-analysis [6] (the mass region validated by this analysis is also shown in Fig.…”

Section: Scalarsmentioning

confidence: 99%

“…In the states related to the K-matrix poles there is no cloud of real mesons, that is due to the decay processes. This was the reason to call them as "bare states" [8].…”

Section: Scalarsmentioning

confidence: 99%

“…The following states have been seen in the scalar-isoscalar sector: f 0 (980), f 0 (1300), f 0 (1500), f 0 (1420 +150 −70 ), f 0 (1750). For the scalar-isovector sector, the analysis [8] points to the presence of the following resonances in the spectra: a 0 (980), a 0 (1520).…”

Section: Scalarsmentioning

confidence: 99%

“…A superfluous state for qq-trajectories are the light σ-meson [5,6,7] and the broad resonance f 0 (1420 +150 − 70 ) observed in the K-matrix analysis [8]: one should consider these states as candidates for the exotics.…”

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confidence: 99%

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Systematics of qq̄ states, scalar mesons and glueball

Anisovich¹

2002

AIP Conference Proceedings

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Systematics of qq states, scalar mesons and glueball V.V. Anisovich * St.Petersburg Nuclear Physics Institute AbstractBasing on the latest results of the PNPI (Gatchina) and QM&W College (London) groups, I discuss systematics of the IJ P C qq states in terms of trajectories on the (n, M 2 ) plane, where n is the radial quantum number and M is its mass. In the scalar sector, which is the most interesting because of the presence of extra states with respect to the qq systematics,

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Section: Scalarsmentioning

confidence: 99%

Section: Scalarsmentioning

confidence: 99%

“…In the states related to the K-matrix poles there is no cloud of real mesons, that is due to the decay processes. This was the reason to call them as "bare states" [8].…”

Section: Scalarsmentioning

confidence: 99%

Section: Scalarsmentioning

confidence: 99%

mentioning

confidence: 99%

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Systematics of qq̄ states, scalar mesons and glueball

Anisovich¹

2002

AIP Conference Proceedings

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The light σ-meson

Anisovich

Nikonov

2000

Eur. Phys. J. A

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In the framework of the dispersion relation N/D-approach, we restore the low-energy ππ (IJ P C = 00 ++ )-wave amplitude sewing it with the previously obtained K-matrix solution for the region 450-1900 MeV. The restored N/D-amplitude has a pole on the second sheet of the complex-s plane near the ππ threshold, that is the light σ-meson.12.39. Mk, At present the understanding of scalar meson is one of the key problems for the Strong-QCD physics. The ππ low-mass data provide indications on the existence of a low-mass σ-meson. This state is beyond qq and gluonium systematics, which makes it necessary to confirm its existence as well as to study the possible mechanisms of its formation.Experimental data on meson spectra accumulated by the Crystal Barrel Collaboration [1], GAMS [2] and BNL [3] groups provided a good basis for setting up the qq/gluonium classification of the light scalars. For the (IJ P C = 00 ++ )-wave, the combined K-matrix analysis of the reactions ππ → ππ, KK, ηη, ηη ′ , ππππ has been carried out over the mass range 450-1900 MeV [4,5], then the K-matrix analysis was extended to the waves , thus making it possible to establish the qq systematics of scalars for 1 3 P 0 qq and 2 3 P 0 qq multiplets. The advantage of the K-matrix representation is that it allows us not only to determine the locations and partial widths of resonances but also to study characteristics of corresponding states with switched off decay channels: these "primary states", or "bare states" (i.e. states without a cloud of mesons produced by decay processes) are suitable objects for the qq/gluonium classification (see [7] for the details). The decay processes in the scalar/isoscalar sector cause a strong mixing which destroys the qq/gluonium classification. Another important effect generated by transitions (qq) 1 → real mesons → (qq) 2 is an accumulation of widths of neighbouring resonances by one of them, that results in appearance of a broad state.According to [4,5], five bare scalar/isoscalar states are located in the region 700-1800 MeV: f An important result of the article [4,5] is that the K-matrix 00 ++ -amplitude has no pole singularities in the region 500-800 MeV. Here the ππ-scattering phase δ 0 0 increases smoothly reaching 90• at 800-900 MeV. A straightforward explanation of such a behaviour of δ 0 0 might consist in the presence of a broad resonance, with a mass about 600-900 MeV and width Γ ∼ 500 MeV (for example, see Refs. [10,11] and references therein). However, according to the Kmatrix solution [4,5], the 00 ++ -amplitude does not contain pole singularities on the second sheet of the complex-M ππ plane inside the interval 450 ≤ Re M ππ ≤ 900 MeV: the K-matrix amplitude has a low-mass pole only, which is located on the second sheet either near the ππ threshold or even below it. In [4,5], the presence of this pole was not emphasized, for the left-hand cut, which is important for the reconstruction of analytic structure of the low-energy partial amplitude, was taken into account only indirectly; a proper way for the ...

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Identification of the glueballs and the scalar meson nonet of lowest mass

Minkowski

Ochs

1999

Eur. Phys. J. C

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We discuss the theoretical expectations and phenomenological evidence for the lightest glueballs and the members of the meson nonet with quantum numbers J P C = 0 ++ . We reconsider the recent evidence for candidate states with masses below ∼1700 MeV, but include also the results from earlier phase-shift analyses. Arguments are presented to classify the scalars f 0 (980) and f 0 (1500) as members of the 0 ++ nonet, with a mixing rather similar to that of the pseudoscalars η and η. The S-wave states called f 0 (400 − 1200) and f 0 (1370) are considered as different signals from a single broad resonance, which we take to be the lowest-lying 0 ++ glueball. This state together with η(1440) and f J (1710) with spin J = 2 form the basic triplet of binary gluonic bound states. We argue that these hypotheses are consistent with what can be expected theoretically.

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Two-pion spectra for the reaction π− p → π0π0 n at a pion momentum of 38 GeV/c and combined analysis of GAMS, Crystal Barrel, and BNL data

Cited by 28 publications

References 22 publications

Systematics of qq̄ states, scalar mesons and glueball

Systematics of qq̄ states, scalar mesons and glueball

The light σ-meson

Identification of the glueballs and the scalar meson nonet of lowest mass

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