MadGraph/MadEvent 4.0 SUSY, 2HDM and more Johan Alwall Center for Particle Physics and Phenomenology (CP3), Université Catholique de Louvain Fabio Maltoni (UCL) Tim Stelzer (UIUC) Simon de Visscher (UCL) Rikkert Frederix (UCL) Michel Herquet (UCL) Charged 2006, Uppsala, Sweden, 15 September 2006

What is MadGraph/MadEvent? Given any* process, generates Feynman diagrams, cross-section and events New models (previously only SM) SUSY, 2HDM and Higgs EFT Framework for easy implementation of new models Web-based generation (no need for Fortran compiler!) or download code Pythia and detector simulation packages for complete event simulation on-line Three clusters (UIUC, Rome and UCL) * Within reason September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 How MG/ME works MadGraph: Generates all possible Feynman diagrams for a process using info from particles.dat and interactions.dat Generates Fortran file with HELAS (Helicity ampliude library) calls for the matrix element of the process Keeps full spin correlations / interference throughout MadEvent: Integrates cross-section and produces weighted/unweighted events using the Single diagram enhanced multichannel integration technique Method parallell in nature – optimal for clusters! September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

MG/ME 4 generation structure Calculator banner proc_card param_card run_card pythia_card pgs_card MG ME Pythia PGS Emph. more independance of each block Feyn. diags. HELAS amplitudes Parton-level events Root-file Plots Hadron-level events Reconstructed events Root-file September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

New models: MSSM CP- and R-parity conserving MSSM Hagiwara, Kaoru, Plehn, Rainwater, Stelzer + Alwall CP- and R-parity conserving MSSM SUSY Les Houches input files – independent of SUSY breaking scheme Using Calculator to get consistent calculations of dependent SM parameters and decay widths Detailed comparison of cross sections for more than 500 processes between SMadGraph, Omega and Amegic++ (hep-ph/0512260) Input files for the 10 Snowmass benchmark points available on the web page September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Studies done with SMadGraph Comparison with Pythia: Squarks/gluinos+jets Plehn, Rainwater, Skands (hep-ph/0511306) Matrix element g ̃g ̃+2j and g ̃u ̃L+2j against Pythia showers SUSY easier than tops! QCD – the heavier the bettter! September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Studies done with SMadGraph Gluino spin determination Compare with “bosonic SUSY” - Universal extra dimensions Alves, Eboli, Plehn (hep-ph/0605067) (many ideas: Smillie & Webber) – gluino decay chain as for mass measurement – compare with first KK g, q, Z, and l – decay asymmetr y b vs. b ̄ [instead of near/far b] – Pure jet obser vables which work: – Obviously need full spin correlations throughout decay chain Gluino spin sits in decay kinematics September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 General 2HDM de Vissher, Herquet Completely general 2HDM, with FCNC and CP violation New tree-level calculator with a web interface, TwoHiggsCalc, to generate the LHA-like param_card Tested in the SM & MSSM limit Also simplified version without FCNC and off-diagonal CKM Sample files including: SM limit, MSSM, type I, II, III, CP viol.,... September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 TwoHiggsCalc Herquet Tree level parameter calculator for the general 2HDM written in C. Starting from Lagrangian parameters, performs numerical computations to minimize the potential and extract relevant parameters for ME: masses, widths, couplings and mixings, as well as BRs that can be useful for cross checking results. Unusual cases (explicit CP violation, FCNCs, ...) are covered. Conversion from any basis to Higgs basis via invariants (see hep-ph/0504050) Input and output files similar to the SUSY Les Houches format. Parameter space can be scanned automatically to produce sets of param_card. September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 TwoHiggsCalc September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 Higgs EFT & User model Higgs Effective Theory (Frederix) Effective couplings of (scalar and pseudoscalar) 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! Used by Pierce et al. in simulation of higher-order operators in Higgs pair production (hep- ph/0609049) September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 Work in progress More models: UED (Alves), Technicolor (Gudnason), ... Specification of complete decay chains Allows for large number of final state particles Still 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 September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 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 and LHEF compliant, interfaces for Pythia, PGS, Root, Herwig ... September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 Try it out Clusters found at: UCL: http://madgraph.phys.ucl.ac.be/ Rome: http://madgraph.roma2.infn.it/ UIUC: http://madgraph.hep.uiuc.edu/ (still version 3) 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! September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 Backup slides September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 The cards pp > W+jjj QCD=3 QED=1 sm 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. 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 September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Particles and interactions September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 Matching of ME and PS MLM-like with Pythia showers (Alwall) (Sudakov suppression from parton showers) CKKW-like with Sherpa showers (Höche - Alwall) (analytic Sudakovs) September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 Results of the web run September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0

Johan Alwall - MadGraph/MadEvent 4.0 Results of the web run 2 September 15. 2006 Johan Alwall - MadGraph/MadEvent 4.0