DESY / SCIENCE PHOTO LIRARY DESY / SCIENCE PHOTO LIRARY
Electron-quark interaction in the H1 detector at DESY, the German particle physics lab in Hamburg. The computer display shows the detector in blue, green & orange, sliced along its length at top and seen end-on at bottom. In the top image, an electron enters from left and a proton from right, both unseen, accelerated in DESY's HERA collider. The electron collides with a quark in the nucleus of the proton. The quark, deflected to upper left, creates a jet of other particles (red tracks & blocks). The electron, meanwhile, turns into an electron-neutrino, which leaves the detector unseen. The end-on view of the same event also shows just the jet created by the quark.
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