Progress on the Pythia 8 event generator

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Cloud #3: The Ridge (d) CMS N ≥ 110, 1.0GeV/c
Strengths and weaknesses (subjectively, absolute or compared with Herwig++ and Sherpa) + fair selection og built-in processes ready to go − no built-in ME generator (need e.g. MadGraph) − matching/merging/NLO usually not automatic ± parton showers of comparable quality + most sophisticated & robust MPI framework + models for diffractive events + most sophisticated & robust hadronization framework − no QED in hadronic decays (need e.g. Photos) + interfaces & many options ⇒ flexible + user-friendly, well documented, many examples + generally comparing well with LHC data . . . − . . . but known discrepancies, e.g. flavour composition Torbjörn Sjöstrand <strong>Progress</strong> on the Pythia 8 event generator slide 45/46
Page 1 and 2: Progress on the Py
Page 3 and 4: Introduction - 2 Events more messy
Page 5 and 6: Pythia 8 development overview Ambit
Page 7 and 8: Interfaces Pythia intended to descr
Page 9 and 10: The Parton-Shower Approach 2 → n
Page 11 and 12: Matrix Elements and Parton Showers
Page 13 and 14: Power vs. wimpy showers - 1 Increas
Page 15 and 16: Multiparton interactions (MPI’s)
Page 17 and 18: Interleaved evolution • Transvers
Page 19 and 20: An x-dependent proton size - 1 Norm
Page 21 and 22: Diffraction - 1 Diffraction Ingelma
Page 23 and 24: The Lund String Model In QCD, for l
Page 25 and 26: Charged Multiplicity Distribution -
Page 27 and 28: Charged Transverse Momentum Distrib
Page 29 and 30: Systematic tuning RIVET: collection
Page 31 and 32: MCnet review MCnet Marie Curie netw
Page 33 and 34: MCPLOTS Repository of comparisons b
Page 35 and 36: BSM physics 2: BSM R-hadrons Physic
Page 37 and 38: BSM physics 3: Hidden Valley (Seclu
Page 39 and 40: W/Z emission in showers: motivation
Page 41 and 42: W/Z emission in showers: progress N
Page 43: Cloud #2: Flavour Composition Torbj

Progress on the Pythia 8 event generator

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