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defining an amplitude...
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angular distributions two-body X and decays
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![{\displaystyle \left[P_{X}(-)^{J_{X}+1+\epsilon }e^{2i\alpha }\left({\begin{array}{cc|c}J_{b_{1}}&L_{X}&J_{X}\\m_{b_{1}}&m_{X}&-1\end{array}}\right)+\left({\begin{array}{cc|c}J_{b_{1}}&L_{X}&J_{X}\\m_{b_{1}}&m_{X}&+1\end{array}}\right)\right]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/fded5277a8bfc72affb1262313d3388212337173) |
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
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| 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) }
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polarization term: η is the polarization fraction
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| 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}} }
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k, q are breakup momenta for the resonance and isobar, respectively
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| 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) }
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Clebsch-Gordan coefficients for isospin sum
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two-stage breakup angular distributions,
currently modeled as
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angular momentum sum Clebsch-Gordan coefficients for b1 and ω decays.
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Clebsch-Gordan coefficients for isospin sums:
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