Skip to content

Avoid Rescaling down the track Pt for cluster-track matches

Some definition explanations on title/why

https://link.springer.com/content/pdf/10.1140%2Fepjc%2Fs10052-017-4756-2.pdf page 4.

Rescale is referred as criterion 2.

Criterion (ii) aims to recover tracks of typically large curvature that have potentially suffered significant energy loss before reaching the calorimeter. Rescaling the momentum of the track to that of the reconstructed cluster allows retention of tracks whose measured momentum in the ID does not match the energy reconstructed in the calorimeter because they have undergone bremsstrahlung. The bremsstrahlungis assumed to have occurred in the ID or the cryostat and solenoid before the calorimeter (for tracks with silicon hits)or in the cryostat and solenoid before the calorimeter (forTRT-only tracks)

Which is all good. But looking the code begs the question

if your aim is to recover bremsstrahlung in the track which the energy of the cluster has recoverered, then does it make sense to scale down the track pt for a low ET random cluster and pretend this a valid match. Especially now the low et topological cluster take the place of the SW 3x5 ones.

The answer implied in this MR is NO. You should really be only rescaling up under the assumption that the cluster has recovered brem.

Edited by Christos Anastopoulos

Merge request reports