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; Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle P_X} is the parity of the resonance

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \left(\frac{1+(-)^\epsilon \eta}{4}\right) }

polarization term: η is the polarization fraction

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle k^{L_X} q^{L_{b_1}} }

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

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \left(\begin{array}{cc|c} I_{b_1} & I_\pi & I_X \\ I_{z\pi^+} & I_{z\pi^-} & I_{z\pi^+}+I_{z\pi^-} \end{array}\right) }

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: