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Strong Decays of Light Vector Mesons

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arxiv nucl-th/0208019 v1 submitted 2002-08-09 nucl-th hep-ph

classification nucl-thhep-ph
keywords massesmesonsmodelvectorbethe--salpeterdecaysequationquark

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The vector meson strong decays rho-->pi pi, phi-->KK, and K^star-->pi K are studied within a covariant approach based on the ladder-rainbow truncation of the QCD Dyson--Schwinger equation for the quark propagator and the Bethe--Salpeter equation for the mesons. The model preserves the one-loop behavior of QCD in the ultraviolet, has two infrared parameters, and implements quark confinement and dynamical chiral symmetry breaking. The 3-point decay amplitudes are described in impulse approximation. The Bethe--Salpeter study motivates a method for estimating the masses for heavier mesons within this model without continuing the propagators into the complex plane. We test the accuracy via the rho, phi and K^{star} masses and then produce estimates of the model results for the a_1 and b_1 masses as well as the mass of the proposed exotic vector pi_1(1400).

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  1. $D^* D \pi$ and $B^* B \pi$ couplings from Dyson-Schwinger equations framework

    hep-ph 2024-11 conditional novelty 5.0 of 10

    A Dyson-Schwinger/Bethe-Salpeter calculation predicts g_D*Dpi = 16.22 and g_B*Bpi = 40.09, with static couplings consistent with lattice results.

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