Question regarding tau tagging in in leptonic channel

[S. Niyogi]

Hi,

I have a question regarding tau tagging in Delphes v3.3. Can Delphes tag a tau from its leptonic decay? I find inside TauTagging.cc module

  for(i = tau->D1; i <= tau->D2; ++i)
  {
    daughter1 = static_cast<Candidate *>(fParticleInputArray->At(i));
    pdgCode = TMath::Abs(daughter1->PID);
    if(pdgCode == 11 || pdgCode == 13 || pdgCode == 15) return -1;
   ..
   ..

If so, how can we tag a tau from its leptonic decay mode ?

Also, I found from another ticket that hhow tau tagging in delphes works: for each reconstructed jet, if we can find a hadronically decayed tau-parton inside a cone DR w.r.t the center of jet, then we apply the efficiency provided by the user using a RN. Then, Delphes does not use track information, does it ? What is use of

set TrackPTMin 1.0  
set DeltaRTrack 0.2

inside tautagging module (given in ATLAS card)?

I will appreciate if you can clarify some of these issues. Thank you in advance.

Regards,
Saurabh

[S. Niyogi]

Can you kindly reply ?

[Pavel Demin]

Can Delphes tag a tau from its leptonic decay?

In the current version of Delphes, there is no a ready-to-use module that simulates the identification of the leptonically decaying taus.

To implement this functionality, we need some input from the experiments to understand how they identify lepton tau decays and what is the performance of this identification.

What is use of TrackPTMin, DeltaRTrack inside tautagging module (given in ATLAS card)?

TrackPTMin and DeltaRTrack are used to select tracks that are inside a cone of radius DeltaR around the jet axis. The code using these parameters can be found at line 273 in TrackCountingTauTagging.cc:

https://cp3.irmp.ucl.ac.be/projects/delphes/browser/git/modules/TrackCountingTauTagging.cc#L237