On properties of the exotic hadrons from QCD sum rulesстатья
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Дата последнего поиска статьи во внешних источниках: 11 марта 2017 г.
Аннотация:We discuss the specific features of extracting properties of the exotic polyquark hadrons (tetraquarks, pentaquarks) compared to the usual hadrons by the QCD sum-rule approach. In the case of the ordinary hadrons, already the one-loop leading-order O(alpha^0_s) correlation functions provide the bulk of the hadron observables, e.g., of the form factor; inclusion of radiative corrections O(alpha_s) modifies already nonzero one-loop contributions. In the case of an exotic hadron, the situation is qualitatively different: discussing strong decays of an exotic tetraquark meson, which provide the main contribution to its width, we show that the disconnected leading-order diagrams are not related to the tetraquark properties. For a proper description of the tetraquark decay width, it is mandatory to calculate specific radiative corrections which generate the connected diagrams.