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Difference between 2to2 interactions 
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#1
Jun814, 04:59 PM

P: 1,066

What is the difference between these interactions?
[itex] a+b \rightarrow c+d[/itex] and [itex] b+a \rightarrow d+c [/itex] ? I was reading the "Stateoftheart formulas for helicity amplitude calculation and all that" ver 2.4, part Ia.  Sphericalvector method for helicity amplitudes (Formalism), by KenIchi Hikasa. In the discrete symmetry and helicity amplitudes sector (pg 5) he gives different invariant matrices [itex]M[/itex] forms for these two above. 


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