ZJetsToQQ (ZToQQ+ 0-3 jets) for HT100-200 GeV

[Raffaella07]

PR to add prod and run cards to produce a gridpack for ZToQQ events with up to 3 spectator jets for central production of the sample.

Sample requested in the scope of H->bb at low pt [1] and X->bb searches[2], needed as peaking bkg + SM candle for analysis strategy validation

[1]https://indico.cern.ch/event/1451208/contributions/6261148/attachments/2980045/5246966/Hbb4Dec24.pdf
[2]https://indico.cern.ch/event/1484653/contributions/6256959/attachments/2984101/5255128/Zprime_bbUpdates.pdf

[lviliani]

Hello! Is this the same process as in the following cards, except for changing the HT bin?

https://github.com/cms-sw/genproductions/tree/dacf55b3d72f2c37013db0ad93253ae8a379671e/bin/MadGraph5_aMCatNLO/cards/production/2017/13TeV/ZJets_LO_MLM/ZJetsToQQ_HT

If so, why don't you add the 4th additional jet in the proc card?

[Raffaella07]

Hello! It is indeed the same process and the cards are generated in the exact same way, though the gridpack for 0-4 jets fails due to condor errors (probably a memory or runtime issue, we are investigating with @bkronhei). Since we do not rely on jet multiplicity and the addition of the fourth jet would yield 0.1% variation on the inclusive cross section we decided to go with 0-3 for the time being. We are also exploring the possibility of expanding the range of this or the 0-4 jets grid from HT100-200 to HT0-200 to be inclusive on the full HT spectrum. We can wait a couple of days and I can modify this PR according to the results of these investigations or we can close this and I can open another one once we are settled on njet and HT spectrum.