On the Emerging Phenomenology of <(A_μ)^2>

Details On the Emerging Phenomenology of <(A_μ)^2> On the Emerging Phenomenology of <(A_μ)^2>

2000-10-10

arxiv.org/abs/hep-ph/0010096v1

Phys.Lett. B501 (2001) 28-36

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pp., Latex2e, 3 figures

Scientific paper

10.1016/S0370-2693(01)00085-5

We discuss phenomenology of the vacuum condensate <(A_\mu)^2> in pure gauge theories, where A_\mu is the gauge potential. Both Abelian and non-Abelian cases are considered. In case of the compact U(1) the non-perturbative part of the condensate <(A_\mu)^2> is saturated by monopoles. In the non-Abelian case, a two-component picture for the condensate is presented according to which finite values of order \Lambda_{QCD}^2 are associated both with large and short distances. We obtain a lower bound on the <(A_\mu)^2> by considering its change at the phase transition. Numerically, it produces an estimate similar to other measurements. Possible physical manifestations of the condensate are discussed.

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