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Try to avoid Rescale for non-GSF tracks

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:check_rescale_for_sel_copy into master

In e/gamma we have 2 main cases of extrapolating tracks.

  • GSF are extrapolated from perigee and perigee rescale. And this is what is done in all places after we have the GSF tracks in place.

  • To create GSF tracks in the 1st place , i.e select what we need to refit we also do certain extrapolations of std track (e.g. Chi2 tracks) particles before refitting them.

  • Try to do these extrapolation only from last measurement. Basically remove the perigee rescaled and relax a bit the selections.

  • This is expected to bring some cpu gains and hopefully will not detoriate performance.

  • If this looks ok. Then some of these extrapolations can then be shared with other domains if we ever go this ways.

Edited by Christos Anastopoulos

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