Changes between Version 1 and Version 2 of Copenhagen2010
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- Apr 6, 2012, 4:33:02 PM (12 years ago)
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Copenhagen2010
v1 v2 16 16 17 17 * [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). 18 * [ :FurtherReading:Perspectives on LHC physics, Ed. by G. Kane and A. Pierce].18 * [wiki:FurtherReading Perspectives on LHC physics, Ed. by G. Kane and A. Pierce]. 19 19 === MadGraph and Pheno Exercises === 20 20 … … 26 26 * Register with a valid e-mail address 27 27 * Feynman diagrams. Generate a few processes (with different QED + QCD couplings) trying to guess which diagrams appear: 28 * uu~ >tt~29 * gg >tt~30 * gg >tt~h31 * uu~ >tt~bb~28 * uu~>tt~ 29 * gg>tt~ 30 * gg>tt~h 31 * uu~>tt~bb~ 32 32 * Subprocess identification. List all subprocesses contributing to: 33 * pp >h>tt~bb~34 * pp >tt~bb~35 * pp >tt~jj33 * pp>h>tt~bb~ 34 * pp>tt~bb~ 35 * pp>tt~jj 36 36 * Look at the new physics models and check the particle and interactions content. 37 37 * Advanced: Download the MG/ME package and play with the standalone version. 38 * [ :SimpleKinematics:Kinematics at the LHC]: refresh the kinematics of an hadron collider.38 * [wiki:SimpleKinematics Kinematics at the LHC]: refresh the kinematics of an hadron collider. 39 39 ==== Tutorial 2: Calculate cross sections and generate events ==== 40 40 41 41 Generate events for a few selected processes and look at the plots: 42 42 43 * ttbar production with decays: pp >tt~>bb~mu+e-ve~vm44 * VV production: pp >VV>leptons, with V=Z,W.45 * Single top + Higgs: pp >tHj (QCD=0, QED=3, j=gudsc,p=gudscb). Show that there is a large negative interference between the diagrams.46 * gg >H>WW43 * ttbar production with decays: pp>tt~>bb~mu+e-ve~vm 44 * VV production: pp>VV> leptons, with V=Z,W. 45 * Single top + Higgs: pp>tHj (QCD=0, QED=3, j=gudsc,p=gudscb). Show that there is a large negative interference between the diagrams. 46 * gg>H>WW 47 47 * Weak boson fusion 48 48 49 49 Some phenomenological applications (at the parton level): 50 50 51 * [ :2Jets:Jets] : Di-jet kinematics and rates in pp collisions.52 * [ :3Jets:3 Jets] : Energy distributions in 3-jet events.53 * [http ://cp3wks05.fynu.ucl.ac.be/twiki/bin/view/Physics/WAsymm Drell-Yan] : Study the rapidity asymmetry at the Tevatron.54 * [ :tt:top production] : %$t \bar t$%production, Tevatron vs LHC.55 * [ :tprime:t' production] : %$t'$%production at the LHC.51 * [wiki:2Jets Jets] : Di-jet kinematics and rates in pp collisions. 52 * [wiki:3Jets 3 Jets] : Energy distributions in 3-jet events. 53 * [https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/WAsymm Drell-Yan] : Study the rapidity asymmetry at the Tevatron. 54 * [wiki:tt top production] : $t \bar t$ production, Tevatron vs LHC. 55 * [wiki:tprime t' production] : $t'$ production at the LHC. 56 56 ==== Tutorial 3: The full simulation chain and advanced features ==== 57 57 … … 64 64 65 65 Choose a channel and investigate signal and background: 66 1. The 2 lepton + missing Et final state: %$ pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $%66 1. The 2 lepton + missing Et final state: $ pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $ 67 67 * Signal 68 68 * 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] … … 71 71 * 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] 72 72 * 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] 73 1. Top associated production %$pp \to t\bar tH$% with %$H \to b \bar b$%73 1. Top associated production $pp \to t\bar tH$ with $H \to b \bar b$ 74 74 * Signal + Background samples: 75 75 * 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] … … 91 91 92 92 Useful extra information: 93 * In the plots %$H_T=\sum ||p_T^{vis}|| + E_T^{miss}$%.93 * In the plots $H_T=\sum ||p_T^{vis}|| + E_T^{miss}$. 94 94 * 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-. 95 95 * 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. … … 103 103 * Importance sampling via an analytic transformation 104 104 * Von Neumann's rejection method : plain and improved 105 * Phase space for 1 - >n particles105 * Phase space for 1 -> n particles 106 106 * Vegas 107 107 * Top decay : comparison among the various methods 108 * qq - >tt production108 * qq -> tt production 109 109 110 110 All 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] … … 120 120 121 121 122
