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Mandelstam variables positivedefiniteness 
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#1
Jul1311, 04:44 AM

P: 4

Let's consider a twobody scattering
[tex]a+b\to c+d.[/tex] Prove that the quantitiy [tex]t=(p_cp_a)^2\leq 0[/tex] where p_c is a fourvector and the square is taken with the mostlyminus metrics. 


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