J/Psi Fits - 4.8.2
 
 
Analysed simon's runs 149663 - 150958? using the jbot0g? sample that was reprocessed with 4.8.2. Files from nglas08:/cdf/scratch/waschke/temp482a/

Ran on 4.8.2 with JPsiModules checked out from the head

Used alignment table 100030 1 GOOD and no extra retracking was required
Require SVX beam position algorithm for all events

Apply the following cuts: 
  if(  Beamtype != 3     ) return kFALSE;
  if(  fitprb1 < 0.001   ) return kFALSE;
  if(  abs(ptmu1)<1.5   ) return kFALSE;
  if(  abs(ptmu2)<1.5   ) return kFALSE;
  if(  !((mu1type==1)||(mu1type==3))       ) return kFALSE;
  if(  !((mu2type==1)||(mu2type==3))       ) return kFALSE;
  if(  cmu1x2xp>9.       ) return kFALSE;
  if(  cmu2x2xp>9.       ) return kFALSE;
  if( ! (  ncthtax1>=36&&ncthtax2>=36
            &&ncthtst1>=24&&ncthtst2>=24
            &&nsihit1>=3&&nsihit2>=3)
         ) return kFALSE;
  if(  silayer1[1]<1       ) return kFALSE;
  if(  silayer2[1]<1       ) return kFALSE;

The root files were:

To do the analysis of the JpsiNtuple (simon's output for example) start root and :

You get a file called j482.root.

To analyze that file, you can run masspt.C. Type root then:

 
 
Runs


Plot 1
All Runs for this data sample(right) and Runs with Beam Info (Left)

The following files were excluded as they had no candidates: 87-116, 119-122, 129-131, 139, 160-162, 172, 178-179, 214, 272-315, 318-340. The left and right plots are not the same because there may be runs within a file that don't have a valid beamline.

Quantities upon which Cuts are Placed

The following plots are those quantities upon which cuts are placed. All plots are made before any cuts are made.

Plot 2a
Uncorrected D0 (no cut used)

Plot 2b
Corrected D0 (no cut used)

Plot 2c
Raw Track Z0 ( no cut used)

Plot 2d
COT Track Axial and Stereo Hits (ax>36, st>24, si>3 for both tracks)

Plot 2e
Silicon Hits (>3 for both tracks)

Plot 2f
Lxy Errors (no cut made)

Plot 2g
Muon Chi2 (< 9)

Plot 2h
Muon Pt and Type (Pt> 1.5 for both and both are Type 1 or 3)

Plot 2j
Di-Muon Pt (no cut made: will study this during fits)

Plot 2k
Fit Probability and Silicon Layer 0 (< 0.001 and layer0>1)

Rough Results

Plot 3a
Mass and D0/SigD0. M1 is before any selection. JpsiMass is after the cuts listed at the top of the page.

Plot 3b
Mass and Lifetime. The mass (h3) is the same as JpsiMass but with 70 instead of 100 bins.

Fit Studies


Study of the window cuts to use was done. Plots include pt dependence of the mass. Binning in Pt of the dimuon pair was done to match Simon's plots. The results are given in plot and tabular form.

Plot 4a (surface)
Plot 4b (box)
Plot of mass vs pt in surface and box form. low pt.

Fits of the mass using guassian plus a flat background are given for dimu pt bins of 2 GeV:

Plot 5a >1.5,1.5-2,2-3,3-4 GeV
Plot 5b 4-5,5-7,7-10,10-15 GeV

Plot 5c Plots of the Mass, sigma and background vs pt. The point at 20GeV is actually anything above 1.5GeV.


The definition of the signal window was +- 50Mev in the Run 1 analysis. The Sidebands were at 3.0 and 3.2 GeV. The value for three standard deviations and 7 standard deviations are given in the table below:
Pt Signal SideBands
>1.5 3.053 to 3.141 2.994 and 3.200
1.5-2 3.056 to 3.138 3.000 and 3.193
2-3 3.056 to 3.138 3.002 and 3.192
3-4 3.054 to 3.140 2.997 and 3.196
4-5 3.052 to 3.142 2.993 and 3.201
5-7 3.050 to 3.144 2.987 and 3.207
7-10 3.045 to 3.149 2.976 and 3.218
10-15 3.037 to 3.157 2.957 and 3.237