Bound state in the vector channel of the extended Nambu--Jona-Lasinio model at fixed f_π

Details Bound state in the vector channel of the extended Nambu--Jona-Lasinio model at fixed f_π Bound state in the vector channel of the extended Nambu--Jona-Lasinio model at fixed f_π

1999-02-16

arxiv.org/abs/hep-ph/9902366v1

Phys.Lett.B451:170-174,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 (eps) figures, to appear in PLB

Scientific paper

10.1016/S0370-2693(99)00195-1

We show that, as a consequence of fixing f_\pi = 93 MeV: (1) a bound state pole in the J^P = 1^- scattering amplitude of the ENJL model exists for arbitrarily weak (positive) vector coupling G_2 so long as the constituent quark mass is sufficiently large; (2) there is a bound state for any quark mass when G_2 \geq 0.6/(8 f_\pi^2); (3) this bound state becomes massless at G_2 = 1/(8 f_\pi^2) and a tachyon for G_2 exceeding it. We show by way of an example that the model has no trouble fitting the \rho meson mass simultaneously with other observables.

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