1. MadGraph/MadEvent 4.0 The New Web Generation Fabio Maltoni (UCL) Tim Stelzer (UIUC) Michel Herquet (UCL) Johan Alwall (UCL) Simon de Visscher (UCL) Rikkert Frederix (UCL) MC4LHC, CERN, 17 July 2006

2. Johan Alwall - MadGraph/MadEvent 4.0 2 July 17th 2006 What is new in MG/ME 4? ● Web-oriented, modular software structure ● New models – SUSY, 2HDM and Higgs EFT – Framework for easy user model implementation ● Multiple/inclusive processes in single run ● Pythia and PGS packages for complete event simulation on-line ● Two new clusters (Rome and UCL) ● Local cluster installation/updating now easy using CVS

3. Johan Alwall - MadGraph/MadEvent 4.0 3 July 17th 2006 MG/ME 4 generation structure proc_card MG run_card Pythia ME Calcula tor PGS param_car d Parton-level events Root-file Plots Hadron-level events Reconstructed events Root-file pythia_card pgs_card Feyn. diags. HELAS amplitudes banne r

4. Johan Alwall - MadGraph/MadEvent 4.0 4 July 17th 2006 ● Whole chain on web or downloaded and run locally ● Cards filled on the web or uploaded (reusable) ● Model parameters prepared with external calculator ● Modular structure – easy to interface to other applications / add new functionality ● Whole structure maintained via CVS ● Open source philosophy – contributions welcome! MG/ME new structure

5. Johan Alwall - MadGraph/MadEvent 4.0 5 July 17th 2006 Calculators ● SLHA-like output format (param_card) ● Can be used by other event generators ● MSSM – Takes SLHA files from any SUSY spectrum generator – Calculates dependent SM parameters and decay widths ● 2HDM – Enter potential parameters and Yukawa couplings – Choice between Higgs basis and general basis – Calculates masses, mixings, couplings and decay widths

6. Johan Alwall - MadGraph/MadEvent 4.0 6 July 17th 2006 New models: MSSM ● CP and R-parity conserving MSSM ● SUSY Les Houches input files – independent of SUSY breaking scheme ● Detailed comparison of cross sections between SMadGraph, Omega and Amegic++ (hep-ph/0512260) ● Input files for the 10 SPS points available Hagiwara, Kaoru, Plehn, Rainwater, Stelzer + Alwall

7. Johan Alwall - MadGraph/MadEvent 4.0 7 July 17th 2006 General 2HDM ● Completely general 2HDM, with FCNC and CP violation ● New tree-level calculator with a web interface, TwoHiggsCalc, to generate the param_card needed by MadEvent ● Generic basis or Higgs basis, intensive use of recent basis invariance techniques (e.g. hep-ph/0504050) ● Tested in the SM & MSSM limit ● Sample files for various cases de Vissher, Herquet, Ovyn

8. Johan Alwall - MadGraph/MadEvent 4.0 8 July 17th 2006 Higgs EFT & User model ● Higgs Effective Theory (Frederix) – Effective couplings of Higgs to gluons ● User model (de Visscher) – General framework for user-defined models – User only needs to introduce the new particles, new interactions, new parameters and new couplings. A Perl script takes care of the rest! – Currently used for a technicolor-like model (Gudnason)

9. Johan Alwall - MadGraph/MadEvent 4.0 9 July 17th 2006 Work in progress ● More models: Technicolor, UED (Alves),... ● Specification of complete decay chains – Allows for large number of final state particles – Keeps full spin correlations ● Automatic matching of matrix elements and parton showers (Alwall - Höche) – Using CKKW and MLM schemes ● Automatic width calculator for new models ● Matrix element techniques for signal selection

10. Johan Alwall - MadGraph/MadEvent 4.0 10 July 17th 2006 Conclusion ● MadGraph/MadEvent 4.0 is available now! ● Key points of its philosophy: – Multi purpose : signal + background with same tool; new models easy to implement, and several already there (MSSM, 2HDM, Higgs EFT,...) – Complete : from model to detector in one run – User friendly : on-line or downloaded – Fast : thanks to parallelized, cluster oriented generation – Portable : easily install on new clusters from CVS – Open : LHA compliant, interfaces for Pythia, PGS, Root, Herwig and more soon

11. Johan Alwall - MadGraph/MadEvent 4.0 11 July 17th 2006 Try it out ● Clusters found at: – UCL: http://madgraph.phys.ucl.ac.be/http://madgraph.phys.ucl.ac.be/ – Rome: http://madgraph.roma2.infn.it/http://madgraph.roma2.infn.it/ – UIUC: http://madgraph.hep.uiuc.edu/ (still version 3)http://madgraph.hep.uiuc.edu/ ● Registration for on-line process generation is quick and automatic ● To do on-line event generation – send us a mail! ● We are continually improving MadGraph/MadEvent, grateful for all feedback!

12. Johan Alwall - MadGraph/MadEvent 4.0 12 July 17th 2006 Backup slides

13. Johan Alwall - MadGraph/MadEvent 4.0 13 July 17th 2006 The cards ● The proc_card: – Defines the process(es), order in couplings and model. ● The param_card: – Defines the model parameters (masses, widths and couplings) in SUSY Les Houches-like format ● The run_card: – Defines the collider, cuts, parton densities and scales ● The pythia_card and pgs_card determine the operation of Pythia and PGS. pp > W+jjj QCD=3 QED=1 sm pp > W+jjj QCD=3 QED=1 sm Block MASS 4 1.40000000E+00 Block MASS 4 1.40000000E+00 1 = lpp1 ! beam 1 type 1 = lpp2 ! beam 2 type 7000 = ebeam1 ! beam 1 energy 7000 = ebeam2 ! beam 2 energy 1 = lpp1 ! beam 1 type 1 = lpp2 ! beam 2 type 7000 = ebeam1 ! beam 1 energy 7000 = ebeam2 ! beam 2 energy

14. Johan Alwall - MadGraph/MadEvent 4.0 14 July 17th 2006 2HDM Calculator

15. Johan Alwall - MadGraph/MadEvent 4.0 15 July 17th 2006 Results of the web run

16. Johan Alwall - MadGraph/MadEvent 4.0 16 July 17th 2006 Particles and interactions

17. Johan Alwall - MadGraph/MadEvent 4.0 17 July 17th 2006 Matching of ME and PS ● MLM-like with Pythia p T - ordered showers (Alwall) (Sudakov suppression from parton showers) ● CKKW-like with Sherpa showers (analytic Sudakovs) (Höche - Alwall)

18. Johan Alwall - MadGraph/MadEvent 4.0 18 July 17th 2006 MG/ME step by step ● Surf on one of our cluster (register, it's free!): http://madgraph.phys.ucl.ac.be http://madgraph.hep.uiuc.eduhttp://madgraph.hep.uiuc.edu (still old version) http://madgraph.roma2.infn.it ● Select a model, input a process and define max QCD/QED order and p,j,l definitions (proc_card)

19. Johan Alwall - MadGraph/MadEvent 4.0 19 July 17th 2006 MG/ME step by step ● MadGraph returns a list of subprocesses with related Feynman diagrams and HELAS amplitudes ● Either you generate events online on our clusters or you download the stand- alone code

20. Johan Alwall - MadGraph/MadEvent 4.0 20 July 17th 2006 MG/ME step by step ● 4 “cards” (txt files) are needed for events generation – param_card : LHA compliant file with values for all the model parameters, should ALWAYS be produced by a “Calculator” – run_card : Collider parameters, # events, scales, cuts,... – pythia_card : Pythia configuration (showering...) – pgs_card : PGS configuration (detector type,...) ● All these cards can be filled online (with web form) or by manually editing text files

21. Johan Alwall - MadGraph/MadEvent 4.0 21 July 17th 2006 MG/ME step by step ● During event generation, MadEvent returns the current status of the computation ● When the run is finished, a full detailed set of output is available

22. Johan Alwall - MadGraph/MadEvent 4.0 22 July 17th 2006 MG/ME step by step

23. Johan Alwall - MadGraph/MadEvent 4.0 23 July 17th 2006 Detector simulation The Big Picture Hard interaction Hadronization MG/ME PGS, CMS, ATLAS,... Pythia, Herwig Parton showers

24. Johan Alwall - MadGraph/MadEvent 4.0 24 July 17th 2006 Future ● More new models (Leptoquark, UED, Top anomalous couplings...) ● Interfaces to the CMS and ATLAS simulation software suites ● Model guessing from data (BARD, inverse problem)