df103_NanoAODHiggsAnalysis.C File Reference

Detailed Description

This tutorial is a simplified but yet complex example of an analysis reconstructing the Higgs boson decaying to two Z bosons from events with four leptons.

The data and simulated events are taken from CERN OpenData representing a subset of the data recorded in 2012 with the CMS detector at the LHC. The tutorials follows the Higgs to four leptons analysis published on CERN Open Data portal (10.7483/OPENDATA.CMS.JKB8.RR42). The resulting plots show the invariant mass of the selected four lepton systems in different decay modes (four muons, four electrons and two of each kind) and in a combined plot indicating the decay of the Higgs boson with a mass of about 125 GeV.

The following steps are performed for each sample with data and simulated events in order to reconstruct the Higgs boson from the selected muons and electrons:

1. Select interesting events with multiple cuts on event properties, e.g., number of leptons, kinematics of the leptons and quality of the tracks.
2. Reconstruct two Z bosons of which only one on the mass shell from the selected events and apply additional cuts on the reconstructed objects.
3. Reconstruct the Higgs boson from the remaining Z boson candidates and calculate its invariant mass.

Definition in file df103_NanoAODHiggsAnalysis.C.