| | 1 | |
| | 2 | |
| | 3 | == 2018 CERN Summer student workshop == |
| | 4 | |
| | 5 | == Animations == |
| | 6 | * [http://mgx0.hep.uiuc.edu/Event/ Interactive Flash version] Note you may want to zoom in! |
| | 7 | * [http://mgx0.hep.uiuc.edu/Event/fast_collisionx6.avi Fast movie (.avi) of collision] |
| | 8 | * [http://mgx0.hep.uiuc.edu/Event/collision.mov Guided movie (.mov) of collision] |
| | 9 | |
| | 10 | |
| | 11 | === Exercises === |
| | 12 | Discover the Higgs at the LHC: |
| | 13 | * Find the best prediction for Higgs production at the LHC [http://maltoni.web.cern.ch/maltoni/TeV4LHC/index.html here]. |
| | 14 | * Find the Higgs branching ratios [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h-br.pdf here]. |
| | 15 | |
| | 16 | Choose a channel and investigate signal and background: |
| | 17 | |
| | 18 | 1. The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$ |
| | 19 | * Signal |
| | 20 | * Events: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-signal.lhe.gz Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-signal.lhco.gz Detector Level] |
| | 21 | * Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-signal-lhe.pdf Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-signal-lhco.pdf Detector Level] |
| | 22 | * Background |
| | 23 | * Events: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l.lhe.gz Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l.lhco.gz Detector Level] |
| | 24 | * Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-lhe.pdf Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-lhco.pdf Detector Level] |
| | 25 | 1. The 2 lepton + missing Et final state: $pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $ |
| | 26 | * Signal |
| | 27 | * Events: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/hww-signal.lhe.gz Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/hww-signal.lhco.gz Detector Level] |
| | 28 | * Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/hww-signal-lhe.pdf Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/hww-signal-lhco.pdf Detector Level] |
| | 29 | * Background |
| | 30 | * Events: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/hww-background.lhe.gz Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-background.lhco.gz Detector Level] |
| | 31 | * Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-background-lhe.pdf Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/h4l-background-lhco.pdf Detector Level] |
| | 32 | 1. Top associated production $pp \to t\bar tH$ with $H \to b \bar b$ |
| | 33 | * Signal + Background samples: |
| | 34 | * Events: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/ttbb.lhe.gz Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/ttbb.lhco.gz Detector Level] |
| | 35 | * Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/ttbb-lhe.pdf Parton Level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/ttbb-lhco.pdf Detector Level] |
| | 36 | |
| | 37 | === The Challenge === |
| | 38 | |
| | 39 | Three "black boxes" are given, in the form of event files in the LHC Olympics format and a series of selected plots: |
| | 40 | |
| | 41 | * Box A : [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/A.lhco.gz Events] Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/A-lhe.pdf Parton level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/A.pdf Detector level] |
| | 42 | * Box B : [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/B.lhco.gz Events] Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/B-lhe.pdf Parton level] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/B.pdf Detector level] |
| | 43 | * Box C : [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/C.lhco.gz Events] Plots: [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/C-lhe.pdf Parton lelve] [https://cp3.irmp.ucl.ac.be/projects/madgraph/attachment/wiki/CernSummerSchool/C.pdf Detector level] |
| | 44 | |
| | 45 | 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: |
| | 46 | |
| | 47 | * Model 1 : Extra Z (zp) : What its mass? Does it have Standard Model couplings to fermions? |
| | 48 | * Model 2 : Heavy Scalar (h): What its mass? Is it a SM Higgs? |
| | 49 | * Model 3 : Extra W (wp+ or wp-) : What its mass? Does it have Standard Model couplings to fermions? |
| | 50 | |
| | 51 | Useful extra information: |
| | 52 | * In the plots $H_T=\sum ||p_T^{vis}|| + E_T^{miss}$. |
| | 53 | * 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-. |
| | 54 | * 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. |
| | 55 | * 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. |
