Glueball-meson molecules

Abstract

Experimental searches for pure glueball states have proven challenging and so far yielded no results. This is believed to occur because glueballs mix with the ordinary $q\bar{q}$ states with the same quantum numbers. We will discuss an alternative mechanism, the formation of the glueball-meson molecular states. We will argue that the wave functions of already observed excited meson states may contain a significant part due to such molecular states. We discuss the phenomenology of glueball-meson molecules and comment on a possible charmless component of the $XYZ$ states.

5 pages, 1 figure; title changed, minor changes to the text, replaced to match the published version

References in corpus (4)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• An updated review of the new hadron states
• The Status of Glueballs
• Singlet-octet-glueball mixing of scalar mesons

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• Revisit the heavy quarkonium double-gluon hybrid mesons with exotic quantum numbers
• Towards heavy double-gluon hybrid mesons with exotic quantum numbers in QCD sum rules
• Exclusive semileptonic $B$ decays to the ground and excited states of light mesons