Jet Reconstruction with Particle Flow in Heavy-Ion Collisions with CMS

Understand

In the particle-flow approach information from all available sub-detector systems is combined to reconstruct all stable particles.

• The global event reconstruction has been shown to improve, in particular, the resolution of jet energy and missing transverse energy in pp collisions compared to purely calorimetric measurements.
• This improvement is achieved primarily by combining the precise momentum determination of charged hadrons in the silicon tracker with the associated energy depositions in the calorimeters.
• By resolving individual particles inside jets, particle flow reduces the sensitivity of the jet energy scale to the jet fragmentation pattern, which is known to be one of the largest sources of systematic uncertainty in jet reconstruction.