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(  ptdimuft<1.5      ) return kFALSE;
  if(  lxyerr1>0.025     ) return kFALSE;
  if(  fabs(d0c1)>0.5    ) return kFALSE;
  if(  fabs(d0c2)>0.5    ) return kFALSE;
  if(  abs(ptmu1f)<1.5   ) return kFALSE;
  if(  abs(ptmu2f)<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 Beamtype cut seems to remove a lot of runs.

 
 
Runs


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

There are no candidates in the following files: 87-116, 119-122, 129-131, 139, 160-162, 172, 178-179, 214, 272-315, 318-340.

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 (cut made on corrected D0)

Plot 2b
Corrected D0 (< 0.5)

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 (< 0.025)

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 (> 1.5GeV)

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 in 2 GeV lots. The results are given in plot and tabular form.

Plot 4a (lego)
Plot 4b (box)
Plot of mass vs pt in lego and box form. Note the acceptance effect at low pt. This gives a different level of background on the left and right sides of the peak in

Plot 4c

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

Plot 5a 2-4,4-6,6-8,8-10 GeV
Plot 5b 10-12,12-14,14-16,16-18 GeV

Plot 5c Plots of the Mass, sigma and background vs pt


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
2-4 3.054 to 3.139 3.000 and 3.196
4-6 3.052 to 3.142 2.992 and 3.201
6-8 3.048 to 3.146 2.982 and 3.211
8-10 3.045 to 3.148 2.977 and 3.217
10-123.042 to 3.152 2.968 and 3.226
12-143.034 to 3.160 2.950 and 3.243
14-163.037 to 3.156 2.958 and 3.235
16-193.038 to 3.155 2.960 and 3.233