The problem of scalar mesons

Achasov, N. N.; Devyanin, S. A.; Shestakov, G. N.

doi:10.1070/pu1984v027n03abeh004034

Cited by 99 publications

(165 citation statements)

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“…The scalar mesons f 0 (980) and a 0 (980) are most likely four-quark states with qqqq quark structure [26,27]. In the limit N C → ∞ such qqqq states are suppressed by a factor 1/N C [17].…”

Section: The Deuteron As a Cooper Np-pairmentioning

confidence: 99%

The Nambu–Jona–Lasinio model of light nuclei

Ivanov

Troitskaya

Faber

2000

EPJ A

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The Nambu-Jona-Lasinio model of the deuteron suggested by Nambu and Jona-Lasinio (Phys. Rev. 124 (1961) 246) is formulated from the first principles of QCD. The deuteron appears as a neutronproton collective excitation, i.e. a Cooper np-pair, induced by a phenomenological local four-nucleon interaction in the nuclear phase of QCD. The model describes the deuteron coupled to itself, nucleons and other particles through one-nucleon loop exchanges providing a minimal transfer of nucleon flavours from initial to final nuclear states and accounting for contributions of nucleon-loop anomalies which are completely determined by one-nucleon loop diagrams. The dominance of contributions of nucleon-loop anomalies to effective Lagrangians of low-energy nuclear interactions is justified in the large N C expansion, where N C is the number of quark colours.

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Section: The Deuteron As a Cooper Np-pairmentioning

confidence: 99%

The Nambu–Jona–Lasinio model of light nuclei

Ivanov

Troitskaya

Faber

2000

EPJ A

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“…According to [1], the contribution of the elastic background (a K − p 1/2 ) B to the P-wave scattering length a K − p 1/2 should be defined by the contribution of all low-energy interactions (a K − p 1/2 ) CA , which can be described within the Effective Chiral Lagrangian (the ECL) approach [22] or that is equivalent within Current Algebra (CA) [23]- [30], supplemented by soft-kaon theorems (SKT) [26]- [30], and the contribution (a K − p 1/2 ) KK of low-energy exchanges with the exotic scalar mesons a 0 (980) and f 0 (980), which are four-quark states [31,32] or KK molecules [32,33]. The description of strong low-energy interactions of these mesons goes beyond the ECL approach, describing strong low-energy interactions of mesons with qq and baryons with qqq quark structures.…”

Section: /2mentioning

confidence: 99%

Energy-level displacement of excitednpstates of kaonic hydrogen

et al. 2005

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We compute the energy level displacement of the excited np states of kaonic hydrogen within the quantum field theoretic and relativistic covariant model of strong low-energyKN interactions suggested in EPJA 21, 11 (2004). For the width of the energy level of the excited 2p state of kaonic hydrogen, caused by strong low-energy interactions, we find Γ 2p = 2 meV = 3 × 10 12 sec −1 . This result is important for the theoretical analysis of the X-ray yields in kaonic hydrogen.

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“…For photoproduction studies the ratio of the two partial cross sections can be motivated by arguments using VMD assumptions [137]: 27) with ξ of order unity, and the transverse cross section is expected to scale with Q 2 as Table 2: Measurements of single neutral vector-meson production at HERA published by the H1 and ZEUS collaborations prior to the end of 1996. The event statistics presented are either quoted directly or estimated from information provided in the respective reference.…”

Section: General Experimental Considerationsmentioning

confidence: 99%

Exclusive Production of Neutral Vector Mesons at the Electron-Proton Collider HERA

Crittenden¹

1997

Springer Tracts in Modern Physics

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The first five years of operation of the multi-purpose experiments ZEUS and H1 at the electron-proton storage ring facility HERA have opened a new era in the study of vector-meson production in high-energy photon-proton interactions. The high center-ofmass energy available at this unique accelerator complex allows investigations in hitherto unexplored kinematic regions, providing answers to long-standing questions concerning the energy-dependence of the ρ 0 , ω, φ, and J/ψ production cross sections. The excellent angular acceptance of these detectors, combined with that of specialized tagging detectors at small production angles, has permitted measurements of elastic and inelastic production processes for both quasi-real photons and those of virtuality exceeding the squared mass of the vector meson. This report provides a quantitative picture of the present status of these studies, comparing them to the extensive measurements in this field at lower energies and summarizing topical developments in theoretical work motivated by the new data.

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The problem of scalar mesons

Cited by 99 publications

References 1 publication

The Nambu–Jona–Lasinio model of light nuclei

The Nambu–Jona–Lasinio model of light nuclei

Energy-level displacement of excitednpstates of kaonic hydrogen

Exclusive Production of Neutral Vector Mesons at the Electron-Proton Collider HERA

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