Field strength correlators in the instanton gas: The importance of the two-instanton contribution

Details Field strength correlators in the instanton gas: The importance of the two-instanton contribution Field strength correlators in the instanton gas: The importance of the two-instanton contribution

2000-02-24

arxiv.org/abs/hep-ph/0002247v1

Phys.Rev. D62 (2000) 096004

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 3 figures

Scientific paper

10.1103/PhysRevD.62.096004

The field strength correlators at zero temperature are semi-classically evaluated fitting the random instanton liquid model to lattice data for quenched SU(3) lattice gauge theory. We restrict ourselves to the lowest order in an instanton density expansion necessary to explain the difference between transverse and longitudinal correlation functions. In the instanton-instanton and instanton-antiinstanton contributions the Schwinger line factors neglected in a previous analysis are numerically taken into account in a weighted Monte Carlo evaluation. This leads to different estimates for instanton size and density. A reasonable description of the correlators within the intermediate range from 0.4 fm to 1 fm is obtained.

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