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High Energy, Nuclear, Particle Physics
How to determine if 2 particles come from the same process
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[QUOTE="mfb, post: 5488964, member: 405866"] It helps, but it doesn't guarantee that the photons really come from the same collision. Two high-energetic photons from different collisions are rare, so the remaining background from that effect is small. The collision that produced the photons is important for a different reason: the invariant mass depends on the photon energies and their directions. The calorimeters give some rough estimate of the direction, but the tracking system is much more precise, so you try to find the collision point based on other tracks produced in the same collision. If you look for two Higgs from the same collision, tracking them doesn't help to find the right combination, as they come from the same spot. You can combine photon 1 with photons 2, 3 and 4, and see which combination best fits to the Higgs mass. Then check if the other two also form a pair that fits to the Higgs mass. If we would not know the Higgs mass yet, you would look for pairings where both pairs lead to approximately the same mass. [/QUOTE]
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High Energy, Nuclear, Particle Physics
How to determine if 2 particles come from the same process
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