Update 01.17.2018 -- Run 9 Embedding: BEMC Tower E/p

Presented below is the E/p distributions for BEMC towers in run 9 data and the run 9 dijet embedding sample.  As a reminder, the run 9 data are from the 'L2gamma' stream.  While the run 9 embedding sample consists of 2-to-2 hard QCD events from Pythia embedded into zero-bias run 9 data.  I extracted the E/p in two ways: method 1 requires tracks to satisfy

  • Nfit > 15
  • Nfit/Nposs > 0.52
  • dca (global) < 1 cm
  • |eta| < 1
  • p > 2 GeV/c

and electrons are selected by requiring dE/dx = (3.4, 5) KeV/cm.  All tracks which pass the track requirements but don't fall into the electrons' dE/dx range are defined to be hadrons.  The towers used in the calculation are required to have exactly 1 track pointing to the tower.  However, the data used satisfy the minimum requirements of the clustering algorithm we use to identify pi0.


In method 2, tracks are required to satisfy:

  • Nfit > 15
  • Nfit/Nposs > 0.52
  • dca (global) < 1 cm
  • |eta| < 1
  • pT > 0.2 GeV/c

and electrons are defined to be a track with |nSigmaE| < 3 and |nSigmaH| > 3 (where the 'E' indicates electron and the 'H' indicates pion, kaon, or proton).  Hadrons are then any tracks passing the requirements and have |nSigmaE| > 3 and |nSigmaH| < 3.  There are no requirements on the number of tracks pointing to the tower used in the calculation, but there are no (additional) trigger conditions applied to the data or embedding.