2015:groups:tools:ttjets
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2015:groups:tools:ttjets [2015/06/05 18:42] rikkert.frederix |
2015:groups:tools:ttjets [2015/07/14 08:31] philippe.gras |
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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: | ||
| *13 TeV. | *13 TeV. | ||
| - | *di-lepton top decays. | + | *di-lepton top decays, with decays to e+mu, e+e and mu+mu. |
| - | *Including hadronisation, but no underlying event or MPI. | + | *Including hadronisation and underlying event/MPI. |
| - | *Use MC truth for top reconstruction, i.e., the lepton, neutrino and b-jet momentum. | + | *Use MC truth for top reconstruction, i.e., the lepton, neutrino and b-jet momentum, using the "ghost" particle definition. The leptons have to have |eta(l)|<2.4 and pT(l)>20 GeV, b-jets must have |eta(b)|<2.4 and pT(b)>30GeV. Standard rivet dressing for the leptons with cone 0.1 (for both electrons and muons) |
| + | *Jets ("j") are defined with anti-kT algorithm, DeltaR=0.4, pT(jet)>30GeV and |eta|<4.7. | ||
| + | *b-jets ("b") have pT(jet)>30GeV and |eta|<2.4. | ||
| + | *Light jets ("lj") have pT(jet)>30GeV and |eta|<4.7, but do not contain a b, even if it's in the region 2.4<|eta|<4.7. | ||
| - | Interesting observables are: | + | Observables: |
| - | *Gap fraction, excluding the b-jets from the top decay | + | *pT(top) |
| - | *top pT spectrum | + | *pT(ttbar) |
| - | *jet multiplicity, both with 30 and 50 GeV jet cuts | + | *pT(ttbar+jet) |
| - | *jet pT's for the 3 hardest jets | + | *m(t,tbar) |
| - | *transverse momentum of the top pair system | + | *m(top) |
| - | *reconstructed mass of the top quark | + | *DeltaPhi(l1,l2) |
| - | *asymmetry | + | *DeltaPhi(lj1,lj2) |
| + | *m(b1,b2) | ||
| + | *# of jets | ||
| + | *# of b-jets | ||
| + | *# of light jets | ||
| + | *pT(j1), pT(j2), pT(j3), pT(j4) | ||
| + | *pT(b1), pT(b2), pT(b3), pT(b4) | ||
| + | *pT(lj1), pT(lj2), pT(lj3), pT(lj4) | ||
| + | *asymmetries: | ||
| + | *lepton | ||
| + | *ttbar | ||
| + | *Gap fraction: Q0, inclusive in Delta y | ||
| *tt+jets as background to ttH. Input from the ttH Working Group here. | *tt+jets as background to ttH. Input from the ttH Working Group here. | ||
| + | |||
| + | |||
| + | Samples generated by: | ||
| CMS: | CMS: | ||
| Line 35: | Line 53: | ||
| 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: | ||
| + | *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 | ||
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| {{: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|}} | ||
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2015/groups/tools/ttjets.txt · Last modified: 2015/09/16 14:58 by rikkert.frederix
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