ID-94 mass , compared to sim mass July-3-06

First I show the scatter plot for the simulation mass-vs-the ID=94
mass for b jets. The projections are also shown.
Similar plot was made by Si for the light jets from 
the W. I will put these here at a later time.
 b jet mass-vs-Id=94 mass  

The PYTHIA mass at the ID=94 level is very different. This was
obtained with the parameter PARJ(82)=1.0, the PYTHIA default
parameter. If we use PARJ(82)=3-4, the PYTHIA Id=94 mass would look
the same as the HERWIG one.
 PYTHIA b ID=94 mass 
THe PYTHIA JETCLU mass is the same as that from HERWIG.
 
 W Mass-vs-DR Studies
  
 Results of studies done by Si (with everybodies advice), summer '05

 W mass at ID94 level -vs- simulated mass 

Top plots and bottom-left plots obtained using Igor's Gen4 large MC
sample obtained using HERWIG. The bottom-right plot is obtained from
the minintuples, with the usual jet cuts.

Top-left: No cuts applied, mass and DR calculated from the ID=94 vectors.
Top-right: q and qbar partons (ID94) smeared with Igor's pt smear routines.
Bottom-left: a cut at 15 GeV is applied on the smeared jets.
Bottom-right: MW from the simulation with jet cuts at 15 GeV and L7 correction

The above plots show that the Dr dependence we see in the simulation
is due to two effects: the smearing of the jets and the cut at 15 GeV.

Please not that there are very few events at DR<0.5 in the plot at top
left. This agrees with Natalia's assessment that there are 0.55/1000
W's with DR<0.4 (CDF6038).

There are also two dimensional color plots made by Si.
 W mass-vs DR in 3D