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Mandelstam variables positive-definiteness

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Clausius
#1
Jul13-11, 04:44 AM
P: 4
Let's consider a two-body scattering
[tex]a+b\to c+d.[/tex]
Prove that the quantitiy
[tex]t=(p_c-p_a)^2\leq 0[/tex]
where p_c is a four-vector and the square is taken with the mostly-minus metrics.
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