Validity of Parametrized Quark Propagator |
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Authors: | ZHU Ji-Zhen ZHOU Li-Juan MA Wei-Xing |
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Institution: | 1. Department of Information and Computing Science,
Guangxi University of Technology, Liuzhou 545006, China
;2. College of Physical Science and Engineering Technology,
Guangxi University, Nanning 530004, China
;3. Institute of High Energy Physics, the Chinese Academy of Sciences, P.O. Box 918, Beijing 100039, China |
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Abstract: | Based on an extensively study of the
Dyson-Schwinger equations for
a fully dressed quark propagator in the “rainbow” approximation, a
parametrized fully dressed quark propagator is proposed in this
paper. The parametrized propagator describes a confining quark
propagator in hadron since it is analytic everywhere in complex
p2-plane and has no Lemmann representation. The validity of
the new propagator is discussed by comparing its predictions on
self-energy functions Af(p2), Bf(p2) and effective
mass Mf(p2) of quark with flavor f to their
corresponding theoretical results produced by Dyson-Schwinger
equations. Our comparison shows that the parametrized quark
propagator is a good approximation to the fully dressed quark
propagator given by the solutions of Dyson-Schwinger equations in
the rainbow approximation and is convenient to use in any
theoretical calculations. |
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Keywords: | quark propagator Dyson-Schwinger equations non-perturbative QCD |
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