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^{2},

*how much energy is required in the center of mass frame to produce the combination?*

I'm somewhat utterly stumped. Obviously, the problem deals with a collision (I'd assume inelastic since the pair derived from the collision is a single mass?) in which relativistic principles need to be taken into consideration. So, my feeble initial attempt is to find the initial versus final mass, wherein:

Minitial=2(proton mass)

Mfinal=2(top-quark mass)

And then compensate for the increase in energy by finding the kinetic energy of the colliding protons. But again, this is little more than a guess.

THANKS FOR THE HELP!