Changes between Version 1 and Version 2 of CernSummerSchool14


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Timestamp:
07/11/14 11:29:40 (5 years ago)
Author:
Rikkert
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  • CernSummerSchool14

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     3== 2013 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   * [http://www.thedailyshow.com/watch/thu-april-30-2009/large-hadron-collider John Ellis on Daily Show]
     10
     11=== Exercises ===
     12
     13Discover the Higgs at the LHC:
     14   * Find the best prediction for Higgs production at the LHC [http://maltoni.web.cern.ch/maltoni/TeV4LHC/index.html here].
     15   * Find the Higgs branching ratios [attachment:h-br.pdf here].
     16
     17Choose a channel and investigate signal and background:
     18
     19   1. The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$
     20      * Signal Plots: [attachment:h4l-signal-lhe.pdf Parton Level] [attachment:h4l-signal-lhco.pdf Detector Level]
     21      * Background Plots: [attachment:h4l-lhe.pdf Parton Level] [attachment:h4l-lhco.pdf Detector Level]
     22   1. Top associated production $pp \to t\bar tH$ with $H \to b \bar b$
     23      * Signal + Background Plots: [attachment:ttbb-lhe.pdf Parton Level] [attachment:ttbb-lhco.pdf Detector Level]
     24
     25=== The Challenge ===
     26
     27Three "black boxes" are given, in the form of event files in the LHC Olympics format and a series of selected plots:
     28
     29   * Box A : [attachment:A.lhco.gz Events] Plots: [attachment:A-lhe.pdf Parton level] [attachment:A.pdf Detector level]
     30   * Box B : [attachment:B.lhco.gz Events] Plots: [attachment:B-lhe.pdf Parton level] [attachment:B.pdf Detector level]
     31   * Box C : [attachment:C.lhco.gz Events] Plots: [attachment:C-lhe.pdf Parton level] [attachment:C.pdf Detector level]
     32
     33Black 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:
     34
     35   * Model 1 : Extra Z (zp) : What is its mass? Does it have Standard Model couplings to fermions?
     36   * Model 2 : Heavy Scalar (h): What is its mass? Is it a SM Higgs?
     37   * Model 3 : Extra W (wp+ or wp-) : What its mass? Does it have Standard Model couplings to fermions?
     38
     39Useful extra information:
     40   * In the plots $H_T=\sum ||p_T^{vis}|| + E_T^{miss}$.
     41   * 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-.
     42   * 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.
     43   * 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
     45* [http://www.youtube.com/watch?v=j50ZssEojtM LHC_Rap]
     46
     47=== Slides ===
     48    *  [attachment:mg5_lectures.pdf Download here]