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Sum of momenta of two protons in LHC

Physics Asked on May 16, 2021

Sum of momenta of two protons in LHC moving in opposite directions is assumed to be zero but it can’t be exactly zero so how close does it get to zero?

One Answer

The sum of the momenta of the two protons is a frame-dependent quantity. In the center of mass frame, their momenta sum to zero. In, for instance, a frame which is boosted parallel to the momentum of one of the protons, relative to the center of mass frame, the sum of their momenta is nonzero.

Answered by Michael Riberdy on May 16, 2021

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