TOF PR Plots Page

Where to find TOF inside CDF:

Block diagram of one TOF channel

TOF separation power plot

Opposite side kaon spectrum

How TOF measures t0:

TOF Reconstruction plots

ADC response

This is for channel 53 from store 860. This channel has a large z^2 component to its attenuation.

Landau function fitted to channel 53 ADC response.

The distribution is for all channels.

Speed of light analysis

• Speed of light is measured from slope of T(east)-T(west) vs z
• The left plot is without applying a walk correction
• The right plot is with a 1/Sqrt(Q) walk correction applied

TOF Performance plots

• The only difference in these two plots is the scale on the y-axis
• Data was from several runs from stream J in store 860
• Positively charge tracks are on the right, negative tracks are on the left.
• Cuts applied:
  • Beta .LT. 1
  • Number of COT hits .GT. 48
  • Uncertainty on event t0 .LT. 50 ps
  • 2-sigma cut on d0 with respect to COT beam position
  • 2-sigma cut on z0 with respect to event vertex z position determined with COT tracks

Particle ID plots

• This shows the phi(1020) signal reconstructed with low momentum (pT less than 1.5 GeV/c) kaons
• Data was from 1.5 pb^-1 of the B_CHARM data set
• The signal is a Breit-Wigner convoluted with a Gaussian resolution function
• The signal estimate is the integral of this function between 1.01 and 1.03 GeV/c^2
• The background estimate is the integral of the background function in this range (indicated by dashed curve)
• The quantity delta t_K/sigma_t will be distributed like a unit Gaussian for real kaons
• Cuts applied:
  • pT of both tracks between 0.4 and 1.5 GeV/c
  • Minimum COT hits: 20 axial, 20 sterio
  • Minimum silicon hits: 2 r-phi hits
  • Impact parameter less than 1 mm with respect to beam line
  • Both tracks in same vertex used to calculate the event t_0