What Does Low Energy Physics Tell Us About The Zero Momentum Gluon Propagator

Details What Does Low Energy Physics Tell Us About The Zero Momentum Gluon Propagator What Does Low Energy Physics Tell Us About The Zero Momentum Gluon Propagator

2010-11-25

arxiv.org/abs/1011.5603v1

Phys.Lett.B695:454-458,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 4 figures, 2 tables

Scientific paper

10.1016/j.physletb.2010.11.056

The connection between QCD, a nonlocal Nambu--Jona-Lasinio type model and the Landau gauge gluon propagator is explored. This two point function is parameterized by a functional form which is compatible with Dyson-Schwinger and lattice QCD results. Demanding the nonlocal model to reproduce the experimental values for the pion mass, the pion decay constant, $\Gamma_{\pi \rightarrow \gamma\gamma}$ and the light quark condensate we conclude that low energy physics does not distinguish between the so-called decoupling and scaling solutions of the Dyson-Schwinger equations. This result means that, provided that the model parameters are chosen appropriately, one is free to chose any of the above scenarios. Furthermore, the nonlocal Nambu--Jona-Lasinio quark model considered here is chiral invariant and satisfies the GMOR relation at the 1% level of precision.

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