Study of exotic resonances in diffractive reactions

Amelin, D.V.; Berdnikov, E. B.; Fenyuk, A. B.; Gouz, Yu.; Dorofeev, V.; Dzhelyadin, R.; Ekimov, A.; Karyukhin, A.N.; Kachaev, I.; Khokhlov, Yu.A.; Константинов, В.Ф.; Kopikov, S. V.; Kostyukhin, V. V.; Likhoded, S.; Matveev, V.; Nikolaenko, V.; Ostankov, A.; Polyakov, B.; Senko, V.A.; Soloviyanov, O.; Solodkov, A. V.; Starchenko, E. A.; Vlassov, E.; Zaǐtsev, A. M.; Tskhadadze, E. G.

doi:10.1016/s0375-9474(00)00238-4

Cited by 19 publications

(18 citation statements)

References 6 publications

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“…They also noted that the wave with J P C = 1 −+ dominates in the η π − final state, peaking near 1.6 GeV and observed a small 1 −+ signal in the f 1 π − final state. VES also reported on the ωπ − π 0 final state [141,142]. In a combined analysis of the η π − , b 1 π and ρ 0 π − final states, they reported the π 1 (1600) state with a mass of 1.61 ± 0.02 GeV and a width of 0.29 ± 0.03 GeV that was consistent with all three final states.…”

Section: Ves Results On the π 1 (1600)mentioning

confidence: 88%

“…Some of the models in the partial-wave analysis of the exotic wave lead to the appearance of a peak near a mass of 1.6 GeV which resembles the π 1 (1600). However, the dependence of the size of this peak on the model used is significant [142]. They note that because the significance of the wave depends very strongly on the assumptions of coherence used in the analysis, the results for 3π final states on the nature of the π 1 (1600) are not reliable.…”

Section: Ves Results On the π 1 (1600)mentioning

confidence: 99%

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Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

198

176

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A review of the theoretical and experimental status of hybrid hadrons is presented. The states π 1 (1400), π 1 (1600), and π 1 (2015) are thoroughly reviewed, along with experimental results from GAMS, VES, Obelix, COMPASS, KEK, CLEO, Crystal Barrel, CLAS, and BNL. Theoretical lattice results on the gluelump spectrum, adiabatic potentials, heavy and light hybrids, and transition matrix elements are discussed. These are compared with bag, string, flux tube, and constituent gluon models. Strong and electromagnetic decay models are described and compared to lattice gauge theory results. We conclude that while good evidence for the existence of a light isovector exotic meson exists, its confirmation as a hybrid meson awaits discovery of its iso-partners. We also conclude that lattice gauge theory rules out a number of hybrid models and provides a reference to judge the success of others.

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Section: Ves Results On the π 1 (1600)mentioning

confidence: 88%

Section: Ves Results On the π 1 (1600)mentioning

confidence: 99%

Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

198

176

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“…Recently, a resonance is observed at COMPASS [2] with J P C = 1 −+ . Some other groups like VES [3]- [5], E852 [6]- [10], and the Crystal Barrel collaboration [11] also observed these states.…”

Section: Introductionmentioning

confidence: 92%

Wave-function-based characteristics of hybrid mesons

2011

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We propose some extensions of the quark potential model to hybrids, fit them to the lattice data and use them for the purpose of calculating the masses, root mean square radii and wave functions at the origin of the conventional and hybrid charmonium mesons. We treat the ground and excited gluonic field between a quark and an antiquark as in the Born-Oppenheimer expansion, and use the shooting method to numerically solve the required Schrödinger equation for the radial wave functions; from these wave functions we calculate the mesonic properties. For masses we also check through a Crank Nichelson discretization. For hybrid charmonium mesons, we consider the exotic quantum number states with J P C = 0 +− , 1 −+ and 2 +− . We also compare our results with the experimentally observed masses and theoretically predicted results of the other models. Our results have implications for scalar form factors, energy shifts, magnetic polarizabilities, decay constants, decay widths and differential cross sections of conventional and hybrid mesons.

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“…Previously experiments at CERN and Serpukhov with the GAMS detectors [28,29], at Brookhaven with BNL-E852 [30,31] and later at Protvino with VES [32,33] were aimed at finding states with gluonic components. Indeed, they each found hints of mesons with 1 −+ quantum numbers in πη and πη , but one could never be certain these were really resonances, rather than simple enhancements.…”

Section: The Richness Of the Hadron Spectrummentioning

confidence: 99%

“…There the high lying states, the a 2 (1320) and π 2 (1670), are easily seen. However, the much smaller 1 −+ ρπ P-wave signal was found to be highly sensitive to leakage from the higher waves, and to treatment of the large ππ S -wave interaction, and so claims of a π 1 (1400) came and went to be replaced by a possible π 1 (1600) [30,32,33,35,36]. To prove the magnitude and relative phase variations arise from a pole in the complex energy plane requires more events with a hermetic detector and more detailed analysis.…”

Section: The Richness Of the Hadron Spectrummentioning

confidence: 99%

Impressions of the Meson Spectrum: Hybrids & Exotics, present and future

Pennington

2016

EPJ Web of Conferences

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Abstract. It has long been expected that the spectrum of hadrons in QCD would be far richer and extensive than experiment has so far revealed. While there have been experimental hints of this richness for some time, it is really only in the last few years that dramatic progress has been seen in the exploration both experimentally and in calculations on the lattice. Precision studies enabled by new technology both with detectors and high performance computations are converging on an understanding of the spectrum in strong coupling QCD. These methodologies are laying the foundation for a decade of potential discovery that electro and photoproduction experiments at Jefferson Lab, which when combined with key results on B and charmonium decays from both e + e − and pp colliders, should turn mere impressions of the light meson spectrum into a high definition picture.

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Study of exotic resonances in diffractive reactions

Cited by 19 publications

References 6 publications

Hybrid mesons

Hybrid mesons

Wave-function-based characteristics of hybrid mesons

Impressions of the Meson Spectrum: Hybrids & Exotics, present and future

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