A quark from each of the incoming LHC protons radiates off a heavy vector boson. These bosons interact or “fuse” to produce a particle, such as a Higgs boson. The initial quarks that first radiated the vector bosons are deflected only slightly and travel roughly along their initial directions. They are then detected as particle "jets" in the different hemispheres of the detector. The figure shows a Feynman diagram of this process.