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Glueballs and Hybrid Mesons

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The Quark Structure of Hadrons

Part of the book series: Lecture Notes in Physics ((LNP,volume 949))

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Abstract

A brief phenomenological review on the status of glueballs and hybrid mesons will now be presented (tetraquarks will be dealt width in Chap. 16). Among the i = 0 scalar mesons at least two candidates, the f 0(1500) and the f 0(1710), dispute the status of ground state glueballs. The first excited glueball state, expected to be a tensor meson, has not been identified yet, although more tensor states have been reported than can be accommodated in the 2++ \(q\overline {q}\) nonets. There is evidence for two isovector mesons, π 1(1400) and π 1(1600), with exotic quantum numbers 1−+ that are incompatible with \(q\overline {q}\) states and which could be hybrid mesons or tetraquark states.

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Notes

  1. 1.

    The decay f 0(1500) → ηη′, which occurs at the kinematical threshold, has been observed with the small branching ratio \(f_{\eta \eta '}\) = (1.9±0.8)% ≪ f ππ = (34.9 ± 2.3)% [14, 20].

  2. 2.

    The η and η′ may have small gluonic components in their wavefunctions, but present data are consistent with a vanishing gluonic contribution. However, the errors are large: < 10% for the η and 29\(^{+18}_{-26}\)% for the η′ [22].

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Authors and Affiliations

  1. Stefan Meyer Institute, Austrian Academy of Sciences, Vienna, Austria

    Claude Amsler

  2. Physics Institute, University of Zurich, Zurich, Switzerland

    Claude Amsler

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  1. Claude Amsler
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Amsler, C. (2018). Glueballs and Hybrid Mesons. In: The Quark Structure of Hadrons. Lecture Notes in Physics, vol 949. Springer, Cham. https://doi.org/10.1007/978-3-319-98527-5_11

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