Changes

Acting with the reflectivity operator on initial and final state brings out the reflectivity eigenvalues of the  

Acting with the reflectivity operator on initial and final state brings out the reflectivity eigenvalues of the  

resonance, photon and reggeon. This result leads to a constraint:

resonance, photon and reggeon. This result leads to a constraint

<math>\displaystyle\epsilon = \epsilon_\gamma \epsilon_R</math>

<math>\displaystyle\epsilon = \epsilon_\gamma \epsilon_R</math> that embodies parity conservation in this decay.

 

=== Proton-Reggeon vertex ===

==== Proton-Reggeon vertex ====  

The amplitude of target proton's emission of an exchange particle, a reggeon, in particular direction and helicity projections can be written as:

The amplitude of target proton's emission of an exchange particle, a reggeon, in particular direction and helicity projections can be written as: