PHYSICS · Multi-part · Fermi University Physics · Particle Physics & Quantum Fields · Electronics, Instrumentation & Communication · Particles, interactions and experiment
Particle Physics, Ch Detectors, event reconstruction and claiming a discovery
Problem
Two clusters in the electromagnetic calorimeter, with no track pointing to either, are measured at E1=70.0GeV and E2=60.0GeV, with an angle of 130.0∘ between their directions.
((a)) Find the reconstructed mass of the pair.
((b)) Each photon energy is measured to 1.5 per cent and the angle is taken as exact. Find the uncertainty on the mass, as a standard deviation, and say whether the pair is consistent with a 125GeV/c2 parent.