U-Channel

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u-Channel

The u quantity is does not have a clear cut interpretation like the s and t channels

u(P1P2)2=(P2P1)2
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u(P1P2)2


uP212P1P2+P22


u2m212E1E2+2p 1p 2


In the center of mass frame of reference,

EE1=E1=E2=E2=E1=E2


and


|p||p 1|=|p 1|=|p 2|=|p 2|


and θ1=θ2 is the angle between p 1 and p 2


t2m12E212|p|2cos θ


Using the relativistic term for Energy


E2=p 2+m2


t2p 21(1+cos θ)




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