This program is a utility for BABAR CP/CPT analysis. It runs in BABAR
(http://www.slac.stanford.edu/BFROOT/) software environment.
It calculates event weights in Monte Carlo events so that the weighted event
distribution follows the specified parameters that describes CP/CPT violation
processes in B0-B0bar mixing.

- INSTALL

The code is hosted in github.com. To clone it to your local computer, do

% git clone git@github.com:gitcheng/dlCPTwgt.git

How to Compile:

% cd dlCPTwgt

Set up environment. Do one of the following.

% source setup.sh      # (bash)
% source setup.csh     # (tcsh)

Build

% ./build.sh

The executable will be in ./bin subdirectory.

- How to run:

Set up environment. Need to do this to make sure the ROOT version
is consistent with the build. Do one of the following.

% source setup.sh      # (bash)
% source setup.csh     # (tcsh)

This program takes several arguments, including input root file name,
output file name, and CPT parameters. For detail, see

% bin/dilCPTwgt -h

Example:

% bin/dlCPTwgt -i /path/to/ntuples/sp1237_reduced.root -o test1.root --qop2 1.01 --rez 0.003

- Content

The resulting root file contains a TTree "W", and histograms of Delta t in
different charge combinations. The TTree contains event ID branches and
event weight.

Attaching file test1.root as _file0...
root [1] .ls
TFile**		test2.root	
 TFile*				test2.root	
  KEY: TNamed			info;1		In: /nfs/farm/babar/AWG131/TDBC/tomo/reduced_ntuples/reduced_ntuples_SP1237/SJM_SP1237_Run1_R26b_reduced.root;  |q/p|^2= 1.010000; DG/G= 0.000000; z= 0.003000 + 0.000000 i
  KEY: TTree	W;1	Event weights
  KEY: TH1D	hpp;1	N++ Delta t distribution
  KEY: TH1D	hpn;1	N+- Delta t distribution
  KEY: TH1D	hnp;1	N-+ Delta t distribution
  KEY: TH1D	hnn;1	N-- Delta t distribution
root [2] W->Print()
******************************************************************************
*Tree    :W         : Event weights                                          *
*Entries :  4399091 : Total =        70583134 bytes  File  Size =   19295284 *
*        :          : Tree compression factor =   3.66                       *
******************************************************************************
*Br    0 :upperID   : upperID/I                                              *
*Entries :  4399091 : Total  Size=   17646898 bytes  File Size  =     154475 *
*Baskets :      552 : Basket Size=      32000 bytes  Compression= 114.16     *
*............................................................................*
*Br    1 :lowerID   : lowerID/I                                              *
*Entries :  4399091 : Total  Size=   17646898 bytes  File Size  =   16580704 *
*Baskets :      552 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
*Br    2 :wgt       : wgt/D                                                  *
*Entries :  4399091 : Total  Size=   35288983 bytes  File Size  =    2541007 *
*Baskets :     1103 : Basket Size=      32000 bytes  Compression=  13.88     *
*............................................................................*