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2015:groups:tools:ttjets [2015/06/09 12:02]
rikkert.frederix
2015:groups:tools:ttjets [2015/09/16 14:58] (current)
rikkert.frederix [Samples generated by:]
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 ====== ttbar + jets ====== ====== ttbar + jets ======
-The idea is to compare the latest version of all generators to be able to see what the current status of the predictions is. So far, this has never been done for top pair production, including multi-jet merging. 
  
-Go here to sign-up: ​[[2015:groups:topicsignup:​ttbarjets|ttbar + jets]]+//If you are interested in contributing please subscribe ​to the [[https://e-groups.cern.ch/​e-groups/​EgroupsSearch.do?​searchValue=houches-2015-topics-tools-ttj|mailing list]]. You will be asked to log in with your CERN account. If you don't have a CERN account, please fill [[https://​account.cern.ch/​account/​Externals/​RegisterAccount.aspx|this form]] to create a lightweight account.//​ 
 + 
 +The idea is to compare the latest version of all generators to be able to see what the current status of the predictions is. So far, this has never been done for top pair production, including multi-jet merging.
  
 The set-up is the following: The set-up is the following:
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     *ttbar     *ttbar
   *Gap fraction: Q0, inclusive in Delta y   *Gap fraction: Q0, inclusive in Delta y
-  *tt+jets as background to ttH. Input from the ttH Working Group here. 
  
-CMS:+===== Samples generated by: ===== 
 + 
 +**CMS:**
   *MadGraph5_aMC@NLO + Pythia8 with FxFx merging up to 2 extra jets at NLO   *MadGraph5_aMC@NLO + Pythia8 with FxFx merging up to 2 extra jets at NLO
   *POWHEG+Pythia8 inclusive ttbar   *POWHEG+Pythia8 inclusive ttbar
-ATLAS:+**ATLAS:**
   *POWHEG+pythia8 & 6, inclusive ttbar   *POWHEG+pythia8 & 6, inclusive ttbar
-  *... +  * 
-Rikkert Frederix:+**Rikkert Frederix:**
   *MadGraph5_aMC@NLO + Pythia8, inclusive ttbar   *MadGraph5_aMC@NLO + Pythia8, inclusive ttbar
-Simone Alioli: +<​del>​**Simone Alioli:** POWHEG+Pythia8 ttbar+0,​1jet,​ with MinLo</​del>​ 
-  ​*POWHEG+Pythia8 ttbar+0,​1jet,​ with MinLo + 
-Stefan Prestel:+**Stefan Prestel:**
   *Pythia8+UNLOPS merging up to 2 extra jets at NLO   *Pythia8+UNLOPS merging up to 2 extra jets at NLO
-Marek Schoenherr:+**Marek Schoenherr:**
   *Sherpa+OpenLoops with merging up to 2 extra jets at NLO   *Sherpa+OpenLoops with merging up to 2 extra jets at NLO
-Christian Reuschle:+**Christian Reuschle:**
   *Herwig++ (using e.g. MG5+OpenLoops) ttbar+0j NLO matched and ttbar+1j NLO matched   *Herwig++ (using e.g. MG5+OpenLoops) ttbar+0j NLO matched and ttbar+1j NLO matched
  
 +Note: the ttbar comparisons shown on the mcplots.cern.ch site may also be of interest and/or provide sanity checks:
 +  * E.g., http://​mcplots.cern.ch/?​query=plots,​ppppbar,​top-mc,​pTttbar ​
  
 +===== Starting point: Rivet routines and data cards =====
  
-Existing CMS rivet routines for ttbar +**Existing CMS rivet routines for ttbar**\\
 {{:​2015:​groups:​tools:​mc_ttbar_dilep.cc.txt|}} {{:​2015:​groups:​tools:​mc_ttbar_dilep.cc.txt|}}
 {{:​2015:​groups:​tools:​mc_ttbar_hadron.cc.txt|}} {{:​2015:​groups:​tools:​mc_ttbar_hadron.cc.txt|}}
Line 61: Line 65:
 {{:​2015:​groups:​tools:​mc_ttbar_semilep.cc.txt|}} {{:​2015:​groups:​tools:​mc_ttbar_semilep.cc.txt|}}
  
-Available CMS Monte Carlo samples:+**Available CMS Monte Carlo samples:**\\
 with NNPDF30NLO (5 flavour, alphas=0.118),​ top mass=172.5 GeV, TuneCUETP8M1 (Tune:ee 7, Tune:pp 18) with NNPDF30NLO (5 flavour, alphas=0.118),​ top mass=172.5 GeV, TuneCUETP8M1 (Tune:ee 7, Tune:pp 18)
  
-Powheg+Pythia8.205 ttbar card:+**Powheg+Pythia8.205 ttbar card:**\\
 {{:​2015:​groups:​tools:​tt_hdamp_nnpdf30_13tev_powheg.input.txt|}} {{:​2015:​groups:​tools:​tt_hdamp_nnpdf30_13tev_powheg.input.txt|}}
  
-madgraph_aMC@NLO+Pythia8.205 0,1,2 jets NLO merged cards:+**madgraph_aMC@NLO+Pythia8.205 0,1,2 jets NLO merged cards:**\\
 {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_customizecards.dat.txt|}} {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_customizecards.dat.txt|}}
 {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_proc_card.dat.txt|}} {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_proc_card.dat.txt|}}
 {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_run_card.dat.txt|}} {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_run_card.dat.txt|}}
 {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_madspin_card.dat.txt|}} {{:​2015:​groups:​tools:​tt012j_5f_ckm_nlo_fxfx_madspin_card.dat.txt|}}
 +
 +
 +===== Preliminary results ======
 +
 +**From CMS**
 +
 +A Rivet routine enables to get distributions for all the observables listed above, ​ [[http://​ebouvier.web.cern.ch/​ebouvier/​TOPRivetForLesHouches/​CMS_AN_PseudoTop.cc|CMS_AN_PseudoTop.cc]],​ which is making use of a helping class, [[http://​ebouvier.web.cern.ch/​ebouvier/​TOPRivetForLesHouches/​PseudoTop.cc|PseudoTop.cc]] and [[http://​ebouvier.web.cern.ch/​ebouvier/​TOPRivetForLesHouches/​PseudoTop.hh|PseudoTop.hh]].
 +
 +This routine has been run for Powheg + Herwig++ on the one hand, and Powheg + Pythia 8 on the other hand. Distributions are gathered [[http://​ebouvier.web.cern.ch/​ebouvier/​TOPRivetForLesHouches/​plots/​CMS_AN_PseudoTop/​index.html|here]],​ while ''​.yoda''​ files can be found [[http://​ebouvier.web.cern.ch/​ebouvier/​TOPRivetForLesHouches/​Herwig.yoda|here for Powheg + Herwig++]] and [[http://​ebouvier.web.cern.ch/​ebouvier/​TOPRivetForLesHouches/​Pythia8.yoda|there for Powheg + Pythia 8]]. Lepton and ttbar asymmetries and the gap fraction are represented with respect to the ttbar-system mass. In average, they are:
 +
 +^                                          ^ Powheg + Herwig++ ^ Powheg + Pythia 8 ^
 +^ Lepton asymmetry ​                        | 0.0036 ​           | 0.0006 ​           |
 +^ ttbar asymmetry ​                         | 0.007             | 0.005             ​| ​
 +^ Gap fraction ​                            | 0.436             | 0.444             |
 +
2015/groups/tools/ttjets.1433844151.txt.gz · Last modified: 2015/06/09 12:02 by rikkert.frederix