Beyond the rainbow: effects from pion back-coupling

Details Beyond the rainbow: effects from pion back-coupling Beyond the rainbow: effects from pion back-coupling

2008-08-25

arxiv.org/abs/0808.3372v2

Phys.Rev.D78:074006,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 5 figures. Minor typos corrected. Version to appear in PRD

Scientific paper

10.1103/PhysRevD.78.074006

We investigate hadronic unquenching effects in light quarks and mesons. To this end we take into account the back-coupling of the pion onto the quark propagator within the non-perturbative continuum framework of Schwinger-Dyson equations (SDE) and Bethe-Salpeter equations (BSE). We improve on a previous approach by explicitly solving both the coupled system of DSEs and BSEs in the complex plane and the normalisation problem for Bethe-Salpeter kernels depending on the total momentum of the meson. As a result of our study we find considerable unquenching effects in the spectrum of light pseudoscalar, vector and axial-vector mesons.

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