== 2011 CERN Summer student workshop == === Animations === * [http://madgraph.hep.uiuc.edu/Event/ Interactive Flash version] Note you may want to zoom in! * [http://madgraph.hep.uiuc.edu/Event/fast_collisionx6.avi Fast movie (.avi) of collision] * [http://madgraph.hep.uiuc.edu/Event/collision.mov Guided movie (.mov) of collision] === Exercises === Discover the Higgs at the LHC: * 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 [http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/h-br.pdf here]. Choose a channel and investigate signal and background: 1. The 4 lepton final state: %$pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$% * Signal Plots: [http://cp3wks05.fynu.ucl.ac.be/Schools/h4l-signal-lhe.pdf Parton Level] [http://cp3wks05.fynu.ucl.ac.be/Schools/h4l-signal-lhco.pdf Detector Level] * Background Plots: [http://cp3wks05.fynu.ucl.ac.be/Schools/h4l-lhe.pdf Parton Level] [http://cp3wks05.fynu.ucl.ac.be/Schools/h4l-lhco.pdf Detector Level] 1. Top associated production %$pp \to t\bar tH$% with %$H \to b \bar b$% * Signal + Background Plots: [http://cp3wks05.fynu.ucl.ac.be/Schools/ttbb-lhe.pdf Parton Level] [http://cp3wks05.fynu.ucl.ac.be/Schools//ttbb-lhco.pdf Detector Level] === The Challenge === Three "black boxes" are given, in the form of event files in the LHC Olympics format and a series of selected plots: * Box A : [http://cp3wks05.fynu.ucl.ac.be/Schools/A.lhco.gz Events] Plots: [http://cp3wks05.fynu.ucl.ac.be/Schools/A-lhe.pdf Parton level] [http://cp3wks05.fynu.ucl.ac.be/Schools/A.pdf Detector level] * Box B : [http://cp3wks05.fynu.ucl.ac.be/Schools/B.lhco.gz Events] Plots: [http://cp3wks05.fynu.ucl.ac.be/Schools/B-lhe.pdf Parton level] [http://cp3wks05.fynu.ucl.ac.be/Schools/B.pdf Detector level] * Box C : [http://cp3wks05.fynu.ucl.ac.be/Schools/C.lhco.gz Events] Plots: [http://cp3wks05.fynu.ucl.ac.be/Schools/C-lhe.pdf Parton level] [http://cp3wks05.fynu.ucl.ac.be/Schools/C.pdf Detector level] 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: * 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? Useful extra information: * 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. * [http://cp3wks05.fynu.ucl.ac.be/Schools/Worksheets11.pdf Worksheets11.pdf]: Worksheets * [http://www.youtube.com/watch?v=j50ZssEojtM LHC_Rap] * [attachment:CernSummerSchool11.pdf CernSummerSchool11.pdf]: CernSummerSchool11.pdf