Changes between Initial Version and Version 1 of NumSHEP2011


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03/20/12 16:17:51 (8 years ago)
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  • NumSHEP2011

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     3== Collider Event Generation ==
     4==== [http://www.phys.nthu.edu.tw/~numscc/nums-hep2011/ NumS-HEP 2011 school], NCTU, Taiwan, 17-23 Jan 2011 ====
     5
     6=== Authors ===
     7
     8   * Johan Alwall (lecturer)
     9=== Lectures ===
     10
     11Find the pdf of the 3 x 1.5 hours lectures:
     12
     13   * [attachment:NumS-HEP_lectures.pdf NumS-HEP_lectures.pdf]
     14=== References ===
     15
     16   * [http://www.hep.phy.cam.ac.uk/theory/webber/QCDbook.html QCD and Collider Physics] by Keith Ellis, James Stirling, Bryan Webber (Cambridge Monographs, 1996).
     17   * [:FurtherReading:Perspectives on LHC physics, Ed. by G. Kane and A. Pierce].
     18   * [http://home.thep.lu.se/~torbjorn/pythia/lutp0613man2.pdf Pythia 6 Physics and Manual] (excellent introduction to event generation, parton showers and hadronization).
     19=== Basic exercises 1: Familiarize with Software.MadGraph ===
     20
     21   * Logon to the Software.MadGraph web site and register: http://madgraph.hep.uiuc.edu.
     22   * Register with a valid e-mail address
     23   * Feynman diagrams. Generate a few processes (with different QED + QCD couplings) trying to guess which diagrams appear:
     24      * uu~>tt~
     25      * gg>tt~
     26      * gg>tt~h (in SM and HEFT)
     27      * uu~>tt~bb~
     28   * Subprocess identification. List all subprocesses contributing to:
     29      * pp>l+vljj
     30      * pp>tt~bb~
     31      * pp>tt~jj
     32   * Look at the new physics models and check the particle and interactions content.
     33   * Advanced: Download the MG/ME package and play with the standalone version.
     34=== Basic exercises 2: Calculate cross sections and generate events ===
     35
     36   * Generate events for a few selected processes (work in groups, pick one each), for Tevatron and LHC energies. Does the cross section scale as you expect?
     37   * Compare cross sections with the processes of your neighbors. Do they differ as you would expect?
     38   * Look at the generated plots. Are the distributions as you would expect? Discuss with your neighbors.
     39
     40Example processes:
     41   * ttbar production: pp > tt~, QED=0
     42   * W production: pp > l+vl
     43   * Z/gamma* production: pp > e+e-
     44   * g g > (H > e+ ve mu- vm~) (in HEFT model)
     45   * p p > (W+>e+ ve) (W- > mu- vm~) (important background to previous process)
     46=== Advanced exercises 1: The full simulation chain and advanced features ===
     47
     48Try out the Analysis Tools:
     49   * a Fortran-based package: Software.MadAnalysis ([http://madgraph.phys.ucl.ac.be/cgi-bin/NewProcess/download.cgi Download it here])
     50   * a Root-based package: Software.ExRootAnalysis ([http://madgraph.hep.uiuc.edu/Downloads/ExRootAnalysis/ExRootAnalysis_V1.0.7.tar.gz Download it here])
     51   * a Mathematica-based package: [http://v1.jthaler.net/olympicswiki/doku.php?id=lhc_olympics:analysis_tools Chameleon]
     52
     53Study SM Higgs production at the LHC. Choose a channel and investigate signal and background, using either of the packages above:
     54   1. The 2 lepton + missing Et final state: %$ pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $%
     55   1.
     56      * Signal
     57         * Events: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-signal.lhe.gz Parton Level] || [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-signal.lhco.gz Detector Level]
     58         * Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-signal-lhe.pdf Parton Level] || [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-signal-lhco.pdf Detector Level]
     59      * Background
     60         * Events: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background.lhe.gz Parton Level] <span style="color: #000000;">|| </span>[http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background.lhco.gz Detector Level]
     61         * Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background-lhe.pdf Parton Level] <span style="color: #000000;">|| </span>[http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background-lhco.pdf Detector Level]
     62   1. Top associated production %$pp \to t\bar tH$% with %$H \to b \bar b$%
     63      * Signal + Background samples:
     64         * Events: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/ttbb.lhe.gz Parton Level] || [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/ttbb.lhco.gz Detector Level]
     65         * Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/ttbb-lhe.pdf Parton Level] || [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/ttbb-lhco.pdf Detector Level]
     66=== Advanced exercises 2: Implementation of a new model in Software.MadGraph or [http://feynrules.phys.ucl.ac.be/ FeynRules] + Software.MadGraph ===
     67
     68Note that for these exercises you need to download the [http://madgraph.hep.uiuc.edu/Downloads/MG_ME_V4.4.56.tar.gz MadGraph/MadEvent package] (or [https://launchpad.net/madgraph5 MadGraph 5 package]) and work locally. You need a Fortran compiler (and for !MadGraph 5, Python v. 2.6 or 2.7).
     69
     70For !FeynRules download and information, see the [http://feynrules.phys.ucl.ac.be/ FeynRules wiki]
     71   * Implement a (part of a) Standard Model extension into Software.MadGraph, specific for studying a given process. Generate events, study relevant distributions.
     72   * Determine most relevant Standard Model backgrounds with identical final states (&ldquo;non-reducible&rdquo;). If not too complicated, generate backgrounds with cuts determined from signal distributions.
     73   * Which other (&ldquo;reducible&rdquo;) backgrounds might be important?
     74   * Can the signal be seen at Tevatron? At the LHC?
     75==== Animations ====
     76   * [http://madgraph.hep.uiuc.edu/Event/ Interactive Flash version] Note you may want to zoom in!
     77   * [http://madgraph.hep.uiuc.edu/Event/fast_collisionx6.avi Fast movie (.avi) of collision]
     78   * [http://madgraph.hep.uiuc.edu/Event/collision.mov Guided movie (.mov) of collision]
     79   * [http://www.thedailyshow.com/watch/thu-april-30-2009/large-hadron-collider John Ellis on Daily Show]
     80
     81-- Main.JohanAlwall - 2011-01-17
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