Amplitudes for the Exotic b1π Decay

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defining an amplitude...

angular distributions two-body X and decays

resonance helicity sum: ε=0 (1) for x (y) polarization; is the parity of the resonance

polarization term: η is the polarization fraction

k, q are breakup momenta for the resonance and isobar, respectively

Clebsch-Gordan coefficients for isospin sum

two-stage breakup angular distributions, currently modeled as

angular momentum sum Clebsch-Gordan coefficients for b1 and ω decays.

Clebsch-Gordan coefficients for isospin sums: