.. _data:


***************
Data
***************


.. _event_selection:

Event Selection
-----------------

.. warning::

   CASTOR has been discontinue so the data resides at FNAL and also
   under my public at MIT. 


.. _data:

Data
=============================

The full dataset can be found at full dataset::

  FNAL/LPC cubreto/HeavyIons/Onia/Data2011/dimuonTree_150mub.root
  CERN/LxPlus cubreto/HeavyIons/Onia/Data2011/dimuonTree_150mub.root

I started analysing the Heavy Ions data by fitting the three Upsilon
peaks using the `RooFit package <http://root.cern.ch/drupal/content/roofit/>`_::

  > http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/UserCode/Cubreto/Hi2011/Limits/Raa3S_Workspace.C?view=markup

Roofit is a dedicated fitting package which interfaces with `RooStats
<http://root.cern.ch/root/html/RooStats.html/>`_  allowing proper statistical analysis. The
RooFit library provides a toolkit for modeling the expected
distribution of events in a physics analysis. In order to use RooFit
and RooStats you need the latest root version. From Lxplus::

  > source /afs/cern.ch/sw/lcg/external/gcc/4.3.2/x86_64-slc5/setup.csh
  > source /afs/cern.ch/sw/lcg/app/releases/ROOT/5.34.02/x86_64-slc5-gcc43-opt/root/bin/thisroot.csh

Running the fitter will fit the three upsilon peaks. Our nominal
fitter produces the following results.



.. image:: _static/masspeak_Hi_full.gif 
    :width: 300px

Trying the RooKeysPdf option yields.

.. image:: _static/masspeak_Hi_full.gif
    :width: 300px

  


:ref:`custom_look`.