Hadron Spectroscopy Without Constituent Glue

Klempt, E.

doi:10.1142/s0217751x05023232

Cited by 3 publications

(4 citation statements)

References 35 publications

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“…coupling, is therefore the natural choice. This assignment is further confirmed by the fact that its width also matches the expected width for the radially excited ss state [12,96,99], although the lack of observation in K − p can cast some doubts on this hypothesis [95].…”

Section: Radial Excitationmentioning

confidence: 58%

“…Another possible interpretation of the η(1440) structure in terms of one resonance has been proposed in [95]. A node in the η(1440) matrix element could explain the presence of two peaks, at different masses for the a 0 (980)π and the K * K + c.c.…”

Section: Production Mechanism Experimentsmentioning

confidence: 94%

“…The case of η(1295) deserves special discussion. The identification of η(1295) as the η(547) first radial excitation and even its very existence have recently been questioned [95]. The main problem is that all the η(1295) measurements reported in the Review of Particle Properties come from one production mechanism only: π − p. There is no reason why this state should not be observed in other production mechanisms such as antiproton-proton annihilation or J / decay.…”

Section: Radial Excitationmentioning

confidence: 99%

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The case of the pseudoscalar glueball

Masoni

Cicalò

Usai

2006

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

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Glueballs represent a key requirement of quantum chromodynamics as a non-Abelian field theory. Their search provides one of the strongest motivations for meson spectroscopy. The first glueball candidate was identified in 1980 in the J/Ψ radiative decay. Its discovery actually dates back to 1963 and for four decades about 30 experiments, using six different production mechanisms, were dedicated to studying the pseudoscalar states lying in the 1.4–1.5 GeV/c2 mass region. Today, the presence of two pseudoscalar states and an axial vector can be considered as established (see 2004 edition of the Review of Particle Properties). Assuming that η(1295) is established and the nonet filled, the lower mass pseudoscalar, η(1405), becomes a supernumerary and shows the properties of a non- state. Here, we review the experimental effort related to this long search, which can be considered a sort of paradigm for light-quark spectroscopy.

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Section: Radial Excitationmentioning

confidence: 58%

Section: Production Mechanism Experimentsmentioning

confidence: 94%

Section: Radial Excitationmentioning

confidence: 99%

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The case of the pseudoscalar glueball

Masoni

Cicalò

Usai

2006

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

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“…This result is consistent with the flux-tube interpretation of QCD[150] where soft gluons interact so strongly that they are sublimated into a color confinement potential for quarks. The absence of constituent glue in hadronic physics has been invoked also in Ref [151],. where the role of the confining potential is attributed to an instanton induced interaction 31.…”

mentioning

confidence: 97%

Hadronic Form Factor Models and Spectroscopy Within the Gauge/Gravity Correspondence

de Teramond,

Brodsky

2012

Preprint

123

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We show that the nonperturbative light-front dynamics of relativistic hadronic bound states has a dual semiclassical gravity description on a higher dimensional warped AdS space in the limit of zero quark masses. This mapping of AdS gravity theory to the boundary quantum field theory, quantized at fixed light-front time, allows one to establish a precise relation between holographic wave functions in AdS space and the light-front wavefunctions describing the internal structure of hadrons. The resulting AdS/QCD model gives a remarkably good accounting of the spectrum, elastic and transition form factors of the light-quark hadrons in terms of one parameter, the QCD gap scale. The light-front holographic approach described here thus provides a frame-independent first approximation to the light-front Hamiltonian problem for QCD. This article is based on lectures at the

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Where is the pseudoscalar glueball?

Majewski¹,

Meshcheryakov²

2011

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

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The pseudoscalar mesons π(1300), K(1460), η(1295), η(1405) and η(1475) are assumed to form the meson decuplet which includes the glueball as the basis state supplementing the standard SU (3)F nonet of light qq states (q = u, d, s). The decuplet is investigated by using the algebraic approach based on the hypothesis of vanishing exotic commutators (VEC) of SU (3)F "charges" and their time derivatives. This leads to a system of master equations (ME) determining: (a) octet contents of the physical isoscalar mesons, (b) the mass formula relating all masses of the decuplet and (c) the mass ordering rule. The states of the physical isoscalar mesons η(1295), η(1405), η(1475) are expressed as superpositions of the "ideal" qq (N and S) states and the glueball G one. The "mixing matrix" realizing transformation from the unphysical states to the physical ones follows from the octet contents and is expressed totaly by the decuplet meson masses. Among four one-parameter families of the resulting mixing matrices (multitude of the solutions arising from bad quality of data on the π(1300) and K(1460) meson masses) there is a family attributing the glueball-dominated composition to the η(1405) meson. The pseudoscalar decuplet is similar in some respects to the scalar one: both are composed of the excited qq states and G; the mass ordering of their N, S, G -dominated isoscalars is the same. Contrary to the Lattice QCD and other predictions, the mass m G −+ of the pseudoscalar pure glueball state is smaller than the scalar m G

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Hadron Spectroscopy Without Constituent Glue

Cited by 3 publications

References 35 publications

The case of the pseudoscalar glueball

The case of the pseudoscalar glueball

Hadronic Form Factor Models and Spectroscopy Within the Gauge/Gravity Correspondence

Where is the pseudoscalar glueball?

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