wiki:CernSummerSchool12

Version 2 (modified by trac, 7 years ago) (diff)

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2007 CERN Summer student workshop

Exercises

Discover the Higgs at the LHC:

Find the best prediction for Higgs production at the LHC here. Find the Higgs branching ratios here.

Choose a channel and investigate signal and background:

The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$

Signal

Events: Parton Level Detector Level Plots: Parton Level Detector Level

Background

Events: Parton Level Detector Level Plots: Parton Level Detector Level

The 2 lepton + missing Et final state: $pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $

Signal

Events: Parton Level Detector Level Plots: Parton Level Detector Level

Background

Events: Parton Level Detector Level Plots: Parton Level Detector Level

Top associated production $pp \to t\bar tH$ with $H \to b \bar b$

Signal + Background samples:

Events: Parton Level Detector Level Plots: Parton Level 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 : Events Plots: Parton level Detector level Box B : Events Plots: Parton level Detector level Box C : Events Plots: Parton lelve 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.

-- Main.FabioMaltoni - 08 Aug 2007

2012 CERN Summer student workshop

Exercises

Discover the Higgs at the LHC:

Find the best prediction for Higgs production at the LHC here. Find the Higgs branching ratios here.

Choose a channel and investigate signal and background:

The 4 lepton final state: $pp \to H\to Z Z \to e^+e^- \mu^+ \mu^-$ Signal

Events
Parton Level Detector Level
Plots
Parton Level Detector Level Background
Events
Parton Level Detector Level
Plots: Parton Level Detector Level The 2 lepton + missing Et final state
$pp \to H\to W^+ W^- \to e^- \bar \nu_e \mu^+ \nu_\mu $ Signal
Events
Parton Level Detector Level
Plots
Parton Level Detector Level Background
Events
Parton Level Detector Level
Plots
Parton Level Detector Level Top associated production $pp \to t\bar tH$ with $H \to b \bar b$ Signal + Background samples:
Events
Parton Level Detector Level
Plots
Parton Level 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 : Events Plots: Parton level Detector level Box B : Events Plots: Parton level Detector level Box C : Events Plots: Parton lelve 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.

-- Main.FabioMaltoni - 08 Aug 2007 -- Main.FabioMaltoni - 2011-07-12

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