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Flavour Response

Introduction

This Repository contains standalone tools for flavour response studies. Currently this includes the matrix inversion of the 2DTagging method.

More information can be found at the corresponding CMS twiki page.

Dependencies

The entire code is written in python, specifically for the python2 LTS version 2.7.

Needed python packages:

  • pyroot for handling root files and histograms
  • numpy for calculations

2DTagging Method

This tool extracts the MC-Truth flavour composition and the MPF response in each zone from the input histogramms and determines the jet response for each flavour (uds, c, b and gluon) using the matrix inversion.

Input Format

The input format are separate root files for Data and Monte Carlo containing all required histogramms:

  • For MC: MPF response distributions for all flavours (uds/c/b/g/inclusive) in each tagging zone (Q,G,B,C)
  • For Data: MPF response distributions for each tagging zone (Q,G,B,C)

Monte Carlo

ROOT TFile
- TH1D MC_MPF_Zone1Q
- TH1D MC_MPF_Zone1Q_uds
- TH1D MC_MPF_Zone1Q_c
- TH1D MC_MPF_Zone1Q_b
- TH1D MC_MPF_Zone1Q_g
- TH1D MC_MPF_Zone2G
- TH1D MC_MPF_Zone2G_uds
- TH1D MC_MPF_Zone2G_c
- TH1D MC_MPF_Zone2G_b
- TH1D MC_MPF_Zone2G_g
- TH1D MC_MPF_Zone3C
- TH1D MC_MPF_Zone3C_uds
- TH1D MC_MPF_Zone3C_c
- TH1D MC_MPF_Zone3C_b
- TH1D MC_MPF_Zone3C_g
- TH1D MC_MPF_Zone4B
- TH1D MC_MPF_Zone4B_uds
- TH1D MC_MPF_Zone4B_c
- TH1D MC_MPF_Zone4B_b
- TH1D MC_MPF_Zone4B_g

Data

ROOT TFile
- TH1D Data_MPF_Zone1Q
- TH1D Data_MPF_Zone2G
- TH1D Data_MPF_Zone3C
- TH1D Data_MPF_Zone4B

Example Usage

Execute the tagging.py script with the Data and MC files as argument:

./tagging.py --mc examples/ZJet_mc2012_2015-07-14.root --data examples/ZJet_data2012_2015-07-14.root