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Tighten tau thinning in DAOD_PHYS/LITE

Bertrand Martin Dit Latour requested to merge martindl/athena:21.2_PHYS_tausize into 21.2

Hello,

This MR tightens the tau thinning and tau track thinning requirements in DAOD_PHYS/LITE. Instead of keeping taus with [0-5] tracks, we now require [1-3] tracks. This keeps 2p candidates which are used by some analyses, but discards 0p or 4p-5p taus, which were kept before but would likely never be used in analysis.

The size gain has been estimated from the ART tests:

Data before: 17161 taus, 33970 tau tracks
     Disk Size         Fraction    Category Name
       1.245 kb        0.053       tau
       2.103 kb        0.089       InDet
      23.646 kb        1.000       Total

Data after: 11684 taus, 20799 tau tracks
       0.996 kb        0.043       tau
       1.953 kb        0.084       InDet
      23.234 kb        1.000       Total

ttbar MC before: 58919 taus, 125087 tau tracks
       1.698 kb        0.042       tau
       2.894 kb        0.071       InDet
      40.483 kb        1.000       Total

ttbar MC after: 41225 taus, 74472 tau tracks
       1.382 kb        0.034       tau
       2.666 kb        0.066       InDet
      40.098 kb        1.000       Total

Here, "tau" gathers taus and low-pt/high-pt ditaus. The change in thinning is applied to taus only.

Cheers, Bertrand

Edited by Bertrand Martin Dit Latour

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