pandora-pythia FSR

FYI
I just found out that pandora-pythia does not consider QED final-state radiation, i.e., final state electrons and muons do not emit photons.

Background samples

According to the Kuhl and Desch paper the following processes contribute to the background of ZH:

• e+e- → Z/γ → qq(γ)
• e+e- → WW → qqqq
• e+e- → WW → qqlν
  
• e+e- → ZZ → qqqq
  
• e+e- → ZZ → qql+l-
  
• e+e- → ZZ → qqνν
  
• e+e- → Weν → qqeν
  
• e+e- → Ze+e- → qqe+e-
  

But not only some of them will contribute to the leptonic channel as one can see on page 12. After the channel classification, i.e. 2 electrons or 2 muons with momentum > 15 GeV, we need essentially the processes:

1. e+e- → ZZ → qql+l-
   
2. e+e- → Ze+e- → qqe+e-
   
3. e+e- → WW → qqlν
   

The list is ordered according with the contribution in the Kuhl-Desch paper. The process number 3 contributes less but has the largest cross section. If we need that sample (the cuts essentially remove this contribution) we should generate for the nominal luminosity only to save disk space and compare with the scaled signal and the Z background.

Concerning sample 2, I was wondering why the process e+e- → Zμ+μ- → qqμ+μ- was not considered.

For samples 1 and 2, as well as for the signal, we may need samples generated with luminosity of about 4 ab-1.

Another thing in Kuhl-Desch paper that was not clear for me if the meaning of the symbol q. On page 12, table 7 the column with qq says 2 fermions. Would these qq pairs be tau pais for example?