CMS Data Analysis School: $HH \rightarrow bb\tau\tau$ Exercise

Show Contents Hide contents...

Facilitators

• Konstantin Androsov
• Maria Teresa Grippo

Introduction

This is a generic analysis to search for a double Higgs production in the final state with two quarks b and two leptons tau.

In this Twiki, the following colour scheme will be used:

• Commands that you should run will be shown in a gray box, e.g.

  ls -ltr

• Code snippets to be looked at (e.g, as examples) or edited will be shown in a pink box, e.g.

   std::cout << "This is a test" << std::endl; 

• Output such as screen printouts will be shown in a green box, e.g.

  This is a test

Analysis Strategy

Getting set up

Login and set up environment

ssh -Y USERNAME@gridui1.infn.it or USERNAME@gridui2.infn.it
.........

Installation

For this exercise, the bash shell should be used. If you are not sure what shell you are using, run:

Pippo installation $0

Editor Editor

Production and Baseline Selection

The first step of this analysis is production of ntuples from miniAOD.

cmsRun .......

The code is structured in a modular way to select candidates and the objects which are useful for the final selection. BaseTupleProducer. (metti link corretti) is the class for producing BigTrees for mu-tau channel.

Tuple Skimming and Analyzer step

Instruction

The following commands in an example of how to run flat tree production code (UPDATE):

./runx.sh FlatTreeProducer_mutau Analysis/dataset-das/ggH_hh_bbtautau_300.txt data/ggH_300_flat.root Analysis/config/signal-das.cfg /data/shared/Long_Exercise_X_hh_bbtautau/ @0
./runx.sh FlatTreeProducer_mutau Analysis/dataset-das/TTJets_FullLeptMGDecays.txt data/ttbar_flat.root Analysis/config/background-das.cfg /data/shared/Long_Exercise_X_hh_bbtautau/ @0
./runx.sh FlatTreeProducer_mutau Analysis/dataset-das/TauPlusX_Run2012A_22Jan2013_v1.txt data/TauPlusX_flat.root Analysis/config/data.cfg /data/shared/Long_Exercise_X_hh_bbtautau/ @0

runx.sh is the script to run all of the analysis interactively. It passes command line arguments to the main class constructor. The following arguments should be provided for FlatTreeProducer_mutau constructor:

• inputFile - input root file or list of root files that contain “big trees”
• outputFile - file where output “flat tree” and other analysis distributions should be stored
• configFile - configuration that should be used to run the baseline selection
• pathPrefix - prefix to the path where big trees are stored, should be “none” if prefix is not needed
• nEvents - maximum number of original events to process. 0, if all input events should be processed. To identify that this is a number and not a string, prefix “@” is used.

The root file produced as output contains different information:

• two folders with plots before and after each requirement for each candidate selection
• plots with selection sequence for each candidate
• flat Tree part, which contains meaningful variables selected from each module and necessary for final selection

Optional execution with screen Optional execution with screen

man screen

screen
source ~/logincmsdas.sh
cmsenv
. env.sh
./runx.sh FlatTreeProducer_mutau Analysis/dataset-das/ggH_hh_bbtautau_300.txt data/ggH_300_flat.root Analysis/config/signal-das.cfg /data/shared/Long_Exercise_X_hh_bbtautau/ @0

Exercise 1 - Implement AgainstElectron...

Exercise 1a - Draw Simple Distributions

Final steps of the analysis

Introduction

Flat tree analysis

Exercise 5 - Determine Event Categories

Installation from official repository

Additional resources

-- MariaTeresaGrippo - 2018-12-05