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Most models for the strong decay of mesons, as well as unquenched quarkmodels which incorporate the effect of coupling to meson-meson channels, assumethat the coupling is driven by the creation of a quark-antiquark pair in spintriplet. Their matrix elements can be factorised into a sum over(model-dependent) spatial matrix elements multiplied by (model-independent)coefficients. A general expression for these coefficients is obtained, andtheir properties are studied. Numerical tables of the coefficients can be usedas a starting point for future calculations. The coefficients lead tomodel-independent predictions for decay amplitudes and widths, and can explainhow mass shifts in the unquenched quark model do not spoil successfulpredictions of the ordinary (quenched) quark model. This article is based onwork which will be presented in a forthcoming paper.

Angular momentum coefficients for meson strong decay and the unquenched quark model (CHARM 2013)