Reconstructing Collision Data
Event reconstruction at the interaction point
Vertex fitting combines hits from all sub-detectors into a single primary vertex with sub-micron spatial resolution.
Sub-detector energy deposits read out in parallel
Calorimeter towers, muon chambers, and silicon strips stream data through 100 Gb/s optical links into the readout buffers.
Track propagation through the solenoidal field
A 3.8 T axial field curves charged-particle trajectories; the Kalman filter estimates momentum from curvature alone.
Particle identification across detector layers
Muon spectrometers, transition radiation, and time-of-flight combine into a per-track PID likelihood for every charged particle.