Spin-dependent interactions in quarkonia

Details Spin-dependent interactions in quarkonia Spin-dependent interactions in quarkonia

2008-11-16

arxiv.org/abs/0811.2599v1

Phys.Rev.D78:114020,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX4, 37 pages, to appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.78.114020

The spin-dependent interactions in mesons are considered in detail in the framework of the Field Correlator Method. Analytic expressions for the spin-dependent potentials in heavy and light quarkonia are derived with the QCD string moment of inertia taken into account. Recent lattice data are analysed using these formulae and the data are shown to be consistent with very small values of the gluonic correlation length, <0.1 fm. The Field Correlator and the Eichten-Feinberg definitions of the spin-dependent potentials in the lowest, Gaussian approximation for the QCD vacuum are compared to one another and the two approaches are shown to be equivalent in the limit of a vanishing vacuum correlation length, whereas for finite values of the latter the difference between these two approaches can be explained by the contribution of the higher-order field corelators, starting from the quartic one.

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