| 14 | | 1. The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$ |
| 15 | | * Signal Events: [attachment:h4l-signal.lhe.gz Parton Level] [attachment:h4l-signal.lhco.gz Detector Level] Plots: [attachment:h4l-signal-lhe.pdf Parton Level] [attachment:h4l-signal-lhco.pdf Detector Level] |
| 16 | | * Background Events: [attachment:h4l.lhe.gz Parton Level] [attachment:h4l.lhco.gz Detector Level] Plots: [attachment:h4l-lhe.pdf Parton Level] [attachment:h4l-lhco.pdf Detector Level] |
| 17 | | 1. The 2 lepton + missing Et final state: $pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $ |
| 18 | | * Signal Events: [attachment:hww-signal.lhe.gz Parton Level] [attachment:hww-signal.lhco.gz Detector Level] Plots: [attachment:hww-signal-lhe.pdf Parton Level] [attachment:hww-signal-lhco.pdf Detector Level] |
| 19 | | * Background Events: [attachment:hww-background.lhe.gz Parton Level] [attachment:h4l-background.lhco.gz Detector Level] Plots: [attachment:h4l-background-lhe.pdf Parton Level] [attachment:h4l-background-lhco.pdf Detector Level] |
| 20 | | 1. Top associated production $pp \to t\bar tH$ with $H \to b \bar b$ |
| 21 | | * Signal + Background samples: Events: [attachment:ttbb.lhe.gz Parton Level] [attachment:ttbb.lhco.gz Detector Level] Plots: [attachment:ttbb-lhe.pdf Parton Level] [attachment:ttbb-lhco.pdf Detector Level] |
| | 18 | 1. The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$ |
| | 19 | * Signal Plots: [attachment:h4l-signal-lhe.pdf Parton Level] [attachment:h4l-signal-lhco.pdf Detector Level] |
| | 20 | * Background Plots: [attachment:h4l-lhe.pdf Parton Level] [attachment:h4l-lhco.pdf Detector Level] |
| | 21 | 1. Top associated production $pp \to t\bar tH$ with $H \to b \bar b$ |
| | 22 | * Signal + Background Plots: [attachment:ttbb-lhe.pdf Parton Level] [attachment:/ttbb-lhco.pdf Detector Level] |
| | 39 | * In the plots $H_T=\sum ||p_T^{vis}|| + E_T^{miss}$. |
| | 40 | * 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-. |
| | 41 | * 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. |
| | 42 | * 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. |
| 39 | | * In the plots $H_T=\sum ||p_T^{vis}|| + E_T^{miss}$. |
| 40 | | * 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-. |
| 41 | | * 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. |
| 42 | | * 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. |
| | 44 | * [attachment:Worksheets11.pdf Worksheets11.pdf]: Worksheets |
| 46 | | |
| 47 | | 2012 CERN Summer student workshop |
| 48 | | |
| 49 | | Exercises |
| 50 | | |
| 51 | | Discover the Higgs at the LHC: |
| 52 | | |
| 53 | | Find the best prediction for Higgs production at the LHC [http://maltoni.web.cern.ch/maltoni/TeV4LHC/index.html here]. Find the Higgs branching ratios [attachment:h-br.pdf here]. |
| 54 | | |
| 55 | | Choose a channel and investigate signal and background: |
| 56 | | |
| 57 | | The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$ Signal |
| 58 | | |
| 59 | | Events:: [attachment:h4l-signal.lhe.gz Parton Level] [attachment:h4l-signal.lhco.gz Detector Level] |
| 60 | | Plots:: [attachment:h4l-signal-lhe.pdf Parton Level] [attachment:h4l-signal-lhco.pdf Detector Level] Background |
| 61 | | Events:: [attachment:h4l.lhe.gz Parton Level] [attachment:h4l.lhco.gz Detector Level] |
| 62 | | Plots: [attachment:h4l-lhe.pdf Parton Level] [attachment:h4l-lhco.pdf Detector Level] The 2 lepton + missing Et final state:: $pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $ Signal |
| 63 | | Events:: [attachment:hww-signal.lhe.gz Parton Level] [attachment:hww-signal.lhco.gz Detector Level] |
| 64 | | Plots:: [attachment:hww-signal-lhe.pdf Parton Level] [attachment:hww-signal-lhco.pdf Detector Level] Background |
| 65 | | Events:: [attachment:hww-background.lhe.gz Parton Level] [attachment:h4l-background.lhco.gz Detector Level] |
| 66 | | Plots:: [attachment:h4l-background-lhe.pdf Parton Level] [attachment:h4l-background-lhco.pdf Detector Level] Top associated production $pp \to t\bar tH$ with $H \to b \bar b$ Signal + Background samples: |
| 67 | | Events:: [attachment:ttbb.lhe.gz Parton Level] [attachment:ttbb.lhco.gz Detector Level] |
| 68 | | Plots:: [attachment:ttbb-lhe.pdf Parton Level] [attachment:ttbb-lhco.pdf Detector Level] |
| 69 | | |
| 70 | | The Challenge |
| 71 | | |
| 72 | | Three "black boxes" are given, in the form of event files in the LHC Olympics format and a series of selected plots: |
| 73 | | |
| 74 | | Box A : [attachment:A.lhco.gz Events] Plots: [attachment:A-lhe.pdf Parton level] [attachment:A.pdf Detector level] Box B : [attachment:B.lhco.gz Events] Plots: [attachment:B-lhe.pdf Parton level] [attachment:B.pdf Detector level] Box C : [attachment:C.lhco.gz Events] Plots: [attachment:C-lhe.pdf Parton lelve] [attachment:C.pdf Detector level] |
| 75 | | |
| 76 | | 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: |
| 77 | | |
| 78 | | Model 1 : Extra Z (zp) : What its mass? Does it have Standard Model couplings to fermions? Model 2 : Heavy Scalar (h): What its mass? Is it a SM Higgs? Model 3 : Extra W (wp+ or wp-) : What its mass? Does it have Standard Model couplings to fermions? |
| 79 | | |
| 80 | | Useful extra information: |
| 81 | | |
| 82 | | In the plots $H_T=\sum ||p_T^{vis}|| + E_T^{miss}$. 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-. 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. 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. |
| 83 | | |
| 84 | | -- Main.FabioMaltoni - 08 Aug 2007 -- Main.FabioMaltoni - 2011-07-12 |
| 85 | | |
