Minimum energy positron electron collision producing Z-boson

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khallil
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Homework Statement



ac2e41bf370106a3aef6db69f0571fd0.png

Homework Equations


m2 = E2 - p2 ([/B]

The Attempt at a Solution


I got stuck by not knowing how to handle the frames and I thought you can view the Z boson (CoM) frame, but then you simply get that mz = 2me
 

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khallil said:

The Attempt at a Solution


I got stuck by not knowing how to handle the frames
What does that mean?

and I thought you can view the Z boson (CoM) frame, but then you simply get that mz = 2me
How did you get that?