MC studies at Aachen IIIb A. Stahl, M. Davids, M. Duda, F . Farshbaf, H. Geenen, M. Giffels, W. Haj Ahamd, Th. Hermanns, D. Heydhausen, S. Kalinin, Th. Kress, Y . Küssel, A. Linn, A. Nowack, L. Perchalla, O. Pooth, P . Sauerland, D. T ornier , M. Zöller ● CMS Top physics ● CMS Tau physics (lepton flavour violation) Further activities of Aachen IIIb: ● CMS T racker (Installation/Quality tests/DQM) ● Computing (Aachen Grid)
Top Topics A. Stahl, M. Davids, M. Duda, F . Farshbaf, H. Geenen, W. Haj Ahamd, Th. Hermanns, S. Kalinin, Y . Küssel, D. Tornier , O. Pooth, M. Zöller T op Charge T op rediscovery measurement semileptonic channel (Th. Hermanns) (Y . Küssel) Search for KK top-pair T op mass full hadronic resonances channel (M. Duda) (W. Haj Ahmad) T op rediscovery dileptonic channel Spin-spin correlations (D. Tornier) (M.Davids) T op mass via decay T op mass via topology length of b-hadrons of b-jet (F . Farshbaf) (S. Kalinin)
Top MC issues A. Stahl, M. Davids, M. Duda, F . Farshbaf, H. Geenen, W. Haj Ahamd, Th. Hermanns, S. Kalinin, Y . Küssel, D. Tornier , O. Pooth, M. Zöller Investigation of spin correlations in top pairs: Reweighting ok, needs to unweight SM T opRex (SM-Spin CMS-FastSim + PAT Reco Base histograms (LL,RR,LR, RL) w(cos Θ l - ,cos Θ l - ) asymetry before weighting Spin average) T opRex Not usable, ME are not in the (individual Spin- restframe of the ttbar-system. Spin samples.) Reweighting Fit to (MC-) w(cos Θ l - ,cos Θ l - ) experiment Pythia (w/o Spin ok, but @ tree level correlation) Reweighting Alpgen (Spin-Spin w(cos Θ l - ,cos Θ l - ) Planned, LO SM average) Reweighting MC@NLO (Spin- Planned NLO w(cos Θ l - ,cos Θ l - ) Spin SM average) Need to generate single Spin-Spin events (individual samples or flag events) T opRex: fix ME/maintainance issues, Pythia: no Spin-Spin correlations, MadGraph/Alpgen: only Spin-Spin average
Top MC issues A. Stahl, M. Davids, M. Duda, F . Farshbaf, H. Geenen, W. Haj Ahamd, Th. Hermanns, S. Kalinin, Y . Küssel, D. Tornier , O. Pooth, M. Zöller top rediscovery (dileptonic, semileptonic, full hadronic channel) CMS- PTDR II Pythia (6.325) CMS FastSim kinematic or CMS Reco Alpgen (2.05) Reco Geant FullSim (as part of BG W+jet/Z+jet)
Top MC issues A. Stahl, M. Davids, M. Duda, F . Farshbaf, H. Geenen, W. Haj Ahamd, Th. Hermanns, S. Kalinin, Y . Küssel, D. Tornier , O. Pooth, M. Zöller top charge CMS FastSim Rescale with Select on-shell CMS kinematic Pythia (6.325) or ME element FSR-gamma Reco Reco Geant FullSim generator Could we get a Pythia interface for this ME-Generator (Baur-Generator) Baur: allow to model the tt-γ vertex (charge+Vector/Axial component form-factors)
Top MC issues A. Stahl, M. Davids, M. Duda, F . Farshbaf, H. Geenen, W. Haj Ahamd, Th. Hermanns, S. Kalinin, Y . Küssel, D. Tornier , O. Pooth, M. Zöller ttbar Resonaces Z*, KK,.... Francisco Yumiceva Pythia (standart ttbar) CMS FastSim Kinematic CMS Reco MadGraph (Z*,...) Or Reco Geant fullSim (topBSM model) ....any other ideas are welcome...
Top MC issues A. Stahl, M. Davids, M. Duda, F . Farshbaf, H. Geenen, W. Haj Ahamd, Th. Hermanns, S. Kalinin, Y . Küssel, D. Tornier , O. Pooth, M. Zöller B-decay length / b-jet topology B hadron with high energy B hadron with low energy Pythia (6.325) CMS FastSim kinematic or CMS Reco Alpgen (2.05) Reco Geant FullSim (as part of BG W+jet/Z+jet)
Tau Topics A. Stahl, M. Giffels, Th.Kress, L. Perchalla, P . Sauerland Search for lepton flavour violating τ→μμμ decay: ● Optimized τ-vertex reconstruction (L. Perchalla, P . Sauerland) ● LFV decay (M. Giffels) ● Generator: pythia+tauola μ τ ● Decay mode implemented μ new physics into Pythia μ ● No special ME used ● Event generation according to phase space almost model independent matrix element: Current implementation: ● ME not yet implemented into a generator ● Event selection via hit-and miss according to ME MC issues: c++ stable pythia version...
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