Analysis code for searches of Supersymmetry based on cfA ntuples created in CMSSW 7.X.X.

ROOT version

This code requires RooStats, so we made a special ROOT installation that can be used issuing source /cms5r0/ald77/root/bin/thisroot.sh.

Compiling the code

Issue the following commands in one of the UCSB cmsx machines:

git clone git@github.com:manuelfs/susy_cfa
cd susy_cfa
./compile.sh

The compile step creates the files cfa_base.cpp/hpp, cfa_8.cpp/hpp, cfa_13.cpp/hpp, and cfa.cpp/hpp containing a wrapper class with functions that access all the cfA branches. These functions are automatically created based on example_cfa_file_8.root and example_cfa_file_13.root.

If the structure of the cfA ntuple changes, just copy an example file onto example_cfa_file_XX.root and compile again. You can make a 0 event copy with

1 .L plot/skim_ntuples.C+

2 skim_one("<new_cfa_file.root>")

Multiplexing 8 TeV and 13 TeV branch names

The code allows for the same function to refer to branches with different names in 8 TeV and 13 TeV cfA ntuples. By filling out the file txt/mux_rules.cfg as follows

 New Name        8 TeV Name      13 TeV Name
 -------------------------------------------
 jets            jets_AK5PF      jets_AK4
 fjets           not_used        fastjets_AK4_R1p2_R0p5pT30

all the branch names that in 8 TeV start with jets_AK5PF and in 13 TeV start with jets_AK4 can be called just with jets. For instance, jets_pt() would call jets_AK5PF_pt() in 8 TeV and jets_AK4_pt() in 13 TeV.

Running the code

The definition of physics objects is in src/phys_objects.cpp. Issue the following commands to produce a reduced tree with analysis quantities:

./run/make_tree.exe -i <cfa.root> -n <nevents>

The compilation also automatically generates inc/small_tree.hpp and src/small_tree.cpp with the variables specified in src/generate_small_tree.cxx. This defines the branches of the small tree.