From CERN ATLAS: “What does 8 TeV mean?”
“The LHC collides two beams of protons, each with energy of 4 TeV. If you were standing at the collision point, you would feel a total energy of 8 TeV, but you would not have moved in any direction. In contrast, if you were to be hit by only beam, you are likely to fall backward. Substitute a moving car for the proton beam, and you will see what I mean! OK, so what does 8 TeV mean?”
Visit the blog post here to find out.