English

Exact $m_{quark}\neq 0$ Condensates in $QCD_{1+1}(N_C\rightarrow \infty)$

High Energy Physics - Phenomenology 2007-05-23 v1

Abstract

In the limit of an infinite number of colors, we derive an analytic expression for the quark condensate in QCD1+1QCD_{1+1} as a function of the quark mass and the gauge coupling constant. For zero quark mass, a nonvanishing quark condensate is obtained. Nevertheless, we prove that there is no phase transition as a function of the quark mass. It is furthermore shown that the expansion of 0ψψ0\langle 0 | \overline{\psi}\psi |0\rangle in the gauge coupling has zero radius of convergence but that the perturbation series is Borel summable with finite radius of convergence. The nonanalytic behavior 0ψψ0mq0NCG2\langle 0 | \overline{\psi}\psi |0\rangle \stackrel{m_q\rightarrow0}{\sim} - N_C \sqrt{G^2} can only be obtained by summing the perturbation series to infinite order.

Cite

@article{arxiv.hep-ph/9409333,
  title  = {Exact $m_{quark}\neq 0$ Condensates in $QCD_{1+1}(N_C\rightarrow \infty)$},
  author = {Matthias Burkardt},
  journal= {arXiv preprint arXiv:hep-ph/9409333},
  year   = {2007}
}

Comments

5 pages, 1 postscript figure (available by email from the author), LATEX