Rapiditiy and center of mass energy

earth2
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Hey Folks,

i just wondered if there is a direct connection between the rapidity parameter y and the center of mass energy squared s (for example in the case of two colliding massless particles (aka high energy approx). I tried googling it, but failed to find any satisfying answer.

Thank you in advance!
earth2
 
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There are lots of kinematic relationships. It's like saying "is there a relationship between an object's position and it's energy?" Sure...but the exact relation depends in the exact situation.
 

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