Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-26
J.Phys.G38:015005,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 figures
Scientific paper
10.1088/0954-3899/38/1/015005
In the framework of a semi-classical expansion for quantum chromodynamics in the instanton liquid background, the correlation function of the $0^{++}$ scalar glueball current is given. Besides the pure classical and quantum contributions, the contributions arising from the interactions between the classical instanton fields and quantum gluons are taken into account as well. Instead of the usual zero-width approximation for the resonance, the Brite-Wigner form for the spectral function of the finite-width resonance is adopted. The family of the Laplace sum rules for the scalar glueball in quantum chromodynamics with and without light quarks are studed. A consistency between the subtracted and unsubtracted sum rules are very well justified, and the values of the mass, decay width, and the coupling to the corresponding current for the $0^{++}$ resonance in which the glueball fraction is dominant, are obtained.
Liu Jueping
Wen Shuiguo
Zhang Zhenyu
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