The Lightest scalar glueball
Dec, 199748 pages
Published in:
- Phys.Usp. 41 (1998) 419-439,
- Usp.Fiz.Nauk 168 (1998) 481-502
e-Print:
- hep-ph/9712504 [hep-ph]
PDG: MASS
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Abstract:
Recently performed investigations of meson spectra allow us to determine the resonance structure for the waves , , , = in the mass region up to 1900 MeV, thus establishing the meson multiplets and . Experimental data demonstrate that there are five scalar/isoscalar states in this mass region. Four of them are states, that is, members of the and nonets, while the fifth state is an extra one not accomodated by systematics; it has the properties of the lightest scalar glueball. Analysis of the -wave performed within the framework of the dispersion relation technique allows us to reconstruct the mixing of a pure gluonium with neighbouring scalar states belonging to and nonets: three scalar mesons share the gluonium state between each other -- those are two comparatively narrow resonances and and a broad resonance . The broad state is a descendant of the gluonium, keeping about 40-50% of its component.Note:
- To the memory of Yuri Dmitrievich Prokoshkin
- meson: hadron spectroscopy
- quantum number
- meson: multiplet
- glueball: scalar
- glueball: mass
- partial wave: dispersion relation
- glueball: coupling constant
- expansion 1/N
- Feynman graph
- quark: potential
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