Implementing the smearing of track parameters

[Debjyoti Bardhan]

Hi,
I'm working with track reconstruction and I need to smear tracks for the simulation. Each track is described by five perigee parameters and there exist tracker resolutions for each of the parameters. Looking at the cards, I can find just the resolution in PT for the charged tracks through the tracker. How can I implement the resolution in the four other track parameters in Delphes?

[Michele Selvaggi]

Hi

you can use the TrackSmearing module for that. It will apply an un-correlated smearing of the 5 track parameters.
See here for an example:

​https://github.com/delphes/delphes/blob/master/cards/delphes_card_llptest.tcl#L66

Note that the values in that card are for test only and are not meant to reproduce existing performance.

[Debjyoti Bardhan]

Hi,
I implemented this in my Hadron Smearing Module, but I'm encountering an error. It says that the DZResolutionFormula variable doesn't exist (as don't the others) (Error message "no such variable"). I can understand that this is to be expected since they aren't defined anywhere. Where should these variables be defined and how?