Changes between Version 1 and Version 2 of Milano2010


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Timestamp:
04/06/12 16:33:03 (8 years ago)
Author:
trac
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  • Milano2010

    v1 v2  
    1919
    2020   * [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).
    21    * [:FurtherReading:Perspectives on LHC physics, Ed. by G. Kane and A. Pierce].
     21   * [wiki:FurtherReading Perspectives on LHC physics, Ed. by G. Kane and A. Pierce].
    2222=== MadGraph Exercises ===
    2323
     
    3030   * Register with a valid e-mail address
    3131   * Feynman diagrams. Generate a few processes (with different QED + QCD couplings) trying to guess which diagrams appear:
    32       * uu~>tt~
    33       * gg>tt~
    34       * gg>tt~h
    35       * uu~>tt~bb~
     32      * uu~>tt~
     33      * gg>tt~
     34      * gg>tt~h
     35      * uu~>tt~bb~
    3636   * Subprocess identification. List all subprocesses contributing to:
    37       * pp>h>tt~bb~
    38       * pp>tt~bb~
    39       * pp>tt~jj
     37      * pp>h>tt~bb~
     38      * pp>tt~bb~
     39      * pp>tt~jj
    4040   * Look at the new physics models and check the particle and interactions content.
    4141   * Advanced: Download the MG/ME package and play with the standalone version.
    42    * [:SimpleKinematics:Kinematics at the LHC]: refresh the kinematics of an hadron collider.
     42   * [wiki:SimpleKinematics Kinematics at the LHC]: refresh the kinematics of an hadron collider.
    4343==== Lecture 2: Calculate cross sections and generate events ====
    4444
    4545Generate events for a few selected processes and look at the plots:
    4646
    47    * ttbar production with decays: pp>tt~>bb~mu+e-ve~vm
    48    * VV production: pp>VV> leptons, with V=Z,W.
    49    * Single top + Higgs: pp>tHj (QCD=0, QED=3, j=gudsc,p=gudscb). Show that there is a large negative interference between the diagrams.
    50    * gg>H>WW
     47   * ttbar production with decays: pp>tt~>bb~mu+e-ve~vm
     48   * VV production: pp>VV> leptons, with V=Z,W.
     49   * Single top + Higgs: pp>tHj (QCD=0, QED=3, j=gudsc,p=gudscb). Show that there is a large negative interference between the diagrams.
     50   * gg>H>WW
    5151   * Weak boson fusion
    5252
    5353Some phenomenological applications (at the parton level):
    5454
    55    * [:2Jets:Jets] : Di-jet kinematics and rates in pp collisions.
    56    * [:3Jets:3 Jets] : Energy distributions in 3-jet events.
    57    * [http://cp3wks05.fynu.ucl.ac.be/twiki/bin/view/Physics/WAsymm Drell-Yan] : Study the rapidity asymmetry at the Tevatron.
    58    * [:tt:top production] : %$t \bar t$% production, Tevatron vs LHC.
    59    * [:tprime:t' production] : %$t'$% production at the LHC.
     55   * [wiki:2Jets Jets] : Di-jet kinematics and rates in pp collisions.
     56   * [wiki:3Jets 3 Jets] : Energy distributions in 3-jet events.
     57   * [https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/WAsymm Drell-Yan] : Study the rapidity asymmetry at the Tevatron.
     58   * [wiki:tt top production] : $t \bar t$ production, Tevatron vs LHC.
     59   * [wiki:tprime t' production] : $t'$ production at the LHC.
    6060==== Lecture 3: The full simulation chain and advanced features ====
    6161
     
    6969
    7070Choose a channel and investigate signal and background:
    71    1. The 4 lepton final state: %$pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$%
     71   1. The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$
    7272      * Signal
    7373         * Events: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/h4l-signal.lhe.gz Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/h4l-signal.lhco.gz Detector Level]
     
    7676         * Events: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/h4l.lhe.gz Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/h4l.lhco.gz Detector Level]
    7777         * Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/h4l-lhe.pdf Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/h4l-lhco.pdf Detector Level]
    78    1. The 2 lepton + missing Et final state: %$pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $
     78   1. The 2 lepton + missing Et final state: $pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $
    7979      * Signal
    8080         * 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]
     
    8383         * Events: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background.lhe.gz Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background.lhco.gz Detector Level]
    8484         * Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background-lhe.pdf Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/DiscoverTheHiggs/hww-background-lhco.pdf Detector Level]
    85    1. Top associated production %$pp \to t\bar tH$% with %$H \to b \bar b$%
     85   1. Top associated production $pp \to t\bar tH$ with $H \to b \bar b$
    8686      * Signal + Background samples:
    8787         * 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]
     
    103103
    104104Useful extra information:
    105    * In the plots %$H_T=\sum ||p_T^{vis}|| + E_T^{miss}$%.
     105   * In the plots $H_T=\sum ||p_T^{vis}|| + E_T^{miss}$.
    106106   * A SM-like Z' would decay (more or less democratically) into: jet jet (uu~,cc~,dd~,ss~,bb~), t tbar (tt~), lept+lept- (e+e-,mu+mu-,ta+ta-), neutrino anti-neutrino (ve ve~,vm vm~,vt vt~). It could also have couplings to SM W and Z, and in that case would decay in to ZZ and W+W-.
    107107   * An Higgs couple to particles with a strength which is proportional to the particle masses. A SM-like heavy H would decay in to t tbar (tt~), W+W-, ZZ.
     
    115115   * Importance sampling via an analytic transformation
    116116   * Von Neumann's rejection method : plain and improved
    117    * Phase space for 1 -> n particles
     117   * Phase space for 1 -> n particles
    118118   * Vegas
    119119   * Top decay : comparison among the various methods
    120    * qq -> tt production
     120   * qq -> tt production
    121121
    122122All exercises are presented and solved this Mathematica Notebook: [attachment:mc101.nb mc101.nb]. Reference: [http://www.slac.stanford.edu/spires/find/hep/www?eprint=hep-ph/0006269 Introduction to MC methods], by [http://wwwthep.physik.uni-mainz.de/~stefanw/ Stefan Weinzierl]
     
    134134
    135135
     136