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Parity conservation requires that <math>\epsilon_X=\epsilon_\gamma \epsilon_R</math> and <math>\epsilon_R=\epsilon_i\epsilon_f</math>.  The last two matrix elements in the expression above for <math>T_{fi}</math> not known ''a priori'', so we combine them into a single factor that expresses the net amplitude for producing resonance ''X'' in the given state from the given initial state.
 
Parity conservation requires that <math>\epsilon_X=\epsilon_\gamma \epsilon_R</math> and <math>\epsilon_R=\epsilon_i\epsilon_f</math>.  The last two matrix elements in the expression above for <math>T_{fi}</math> not known ''a priori'', so we combine them into a single factor that expresses the net amplitude for producing resonance ''X'' in the given state from the given initial state.
 
:<math>\displaystyle
 
:<math>\displaystyle
f_X(M_X,\epsilon_X,R,\lambda_R,\epsilon_R,\epsilon_i,\epsilon_f) =  
+
f^{X,M_X,\epsilon_X}_{R,\lambda_R,\epsilon_R;\epsilon_i,\epsilon_f}(s,t) =  
</math>
  −
:::::::::<math>\times
   
\langle J_X M_X \epsilon_X | V |
 
\langle J_X M_X \epsilon_X | V |
 
\epsilon_\gamma; J_R \lambda_R \epsilon_R; \Omega_0\rangle
 
\epsilon_\gamma; J_R \lambda_R \epsilon_R; \Omega_0\rangle

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