| | 1 | |
| | 2 | |
| | 3 | == 2009 CERN Summer student workshop == |
| | 4 | |
| | 5 | === Animations === |
| | 6 | * [http://madgraph.hep.uiuc.edu/Event/ Interactive Flash version] Note you may want to zoom in! |
| | 7 | * [http://madgraph.hep.uiuc.edu/Event/fast_collisionx6.avi Fast movie (.avi) of collision] |
| | 8 | * [http://madgraph.hep.uiuc.edu/Event/collision.mov Guided movie (.mov) of collision] |
| | 9 | |
| | 10 | === Exercises === |
| | 11 | Discover the Higgs at the LHC: |
| | 12 | * Find the best prediction for Higgs production at the LHC [http://maltoni.web.cern.ch/maltoni/TeV4LHC/index.html here]. |
| | 13 | * Find the Higgs branching ratios [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/h-br.pdf here]. |
| | 14 | |
| | 15 | Choose a channel and investigate signal and background: |
| | 16 | |
| | 17 | 1. The 4 lepton final state: %$pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$% |
| | 18 | * Signal Plots: [http://madgraph.hep.uiuc.edu/MadGraphData//tstelzer@uiuc.edu/PROC70/Events/run_02_plots.html Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/h4l-sig2.pdf Detector Level] |
| | 19 | * Background Plots: [http://madgraph.hep.uiuc.edu/MadGraphData/tstelzer@uiuc.edu/PROC73/Events/run_01_plots.html Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//h4l-lhco.pdf Detector Level] |
| | 20 | 1. Top associated production %$pp \to t\bar tH$% with %$H \to b \bar b$% |
| | 21 | * Signal + Background Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//ttbb-lhe.pdf Parton Level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//ttbb-lhco.pdf Detector Level] |
| | 22 | |
| | 23 | === The Challenge === |
| | 24 | |
| | 25 | Three "black boxes" are given, in the form of event files in the LHC Olympics format and a series of selected plots: |
| | 26 | |
| | 27 | * Box A : [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/A.lhco.gz Events] Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//A-lhe.pdf Parton level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//A.pdf Detector level] |
| | 28 | * Box B : [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//B.lhco.gz Events] Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//B-lhe.pdf Parton level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/B.pdf Detector level] |
| | 29 | * Box C : [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//C.lhco.gz Events] Plots: [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//C-lhe.pdf Parton level] [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//C.pdf Detector level] |
| | 30 | |
| | 31 | Black boxes contain only signal events. The students are asked to pair up the boxes above with the following models and also answer to the questions: |
| | 32 | |
| | 33 | * Model 1 : Extra Z (zp) : What its mass? Does it have Standard Model couplings to fermions? |
| | 34 | * Model 2 : Heavy Scalar (h): What its mass? Is it a SM Higgs? |
| | 35 | * Model 3 : Extra W (wp+ or wp-) : What its mass? Does it have Standard Model couplings to fermions? |
| | 36 | |
| | 37 | Useful extra information: |
| | 38 | * In the plots %$H_T=\sum ||p_T^{vis}|| + E_T^{miss}$%. |
| | 39 | * 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-. |
| | 40 | * 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. |
| | 41 | * A SM-like W'+ would decay into: jet jet (ud~,cs~), t b (tb~), lept neutrino (e+ ve , mu+ vm, ta+ vt). It could also have couplings to SM W and Z, and in that case would decay in to ZW. |
| | 42 | |
| | 43 | * [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08//plots.pdf plots.pdf]: testplots |
| | 44 | |
| | 45 | * [attachment:CernSummerSchool09.pdf CernSummerSchool09.pdf]: 2009 presentation |
| | 46 | |
| | 47 | * [attachment:Worksheets09.pdf Worksheets09.pdf]: Worksheets |
| | 48 | |
| | 49 | * [http://www.youtube.com/watch?v=j50ZssEojtM LHC_Rap] |
| | 50 | |
| | 51 | |
| | 52 | -- Main.OlivierMattelaer - 03 Aug 2009 |
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