1. The time-of-flight reconstruction & calibration
Jiang lin li

2. TOF reconstruction flowchart
TOF counter raw data
Associate hits in the TOF
counters with tracks
Calculate time-of-flight and error,
velocity , Mass –squared,
weight for various particle
hypotheses etc
Put these quantities in the track list

3. Filling the Raw data Array
For barrel counters with both ends
TDC and ADC

4. Matching counters with tracks
For each track, a search is made for an associated counter.
There are three possibilities:
1: a MDC track projects into the time-of-flight counter
2: a photon have associated hits in the time-of-flight
3: a counter have a hit without being associated with
any track in the MDC or shower counter

5. Time correction

6. Pulse height corrections

7. Charge sharing algorithm
Two tracks extrapolate to a single barrel counter

8. Calculation of the time of flight two end PMT was fired : one end PMT was fired:

9. time-of-flight errors calculation

10. Calculation of the ß and mass-squared
From the time T and the path length L determined by the drift chamber ,ß is calculated .
From ß and P, Mass-squared of track is calculated.

11. Particle hypothesis probability

12. Put above quantity into the track list

13. Some time correction formula:

18. Time correction in general:
1 Time offset run by run
2 Time-walk correction F(Q)
3 The effective velocity in the scintillator
correction F(z)
4 Cable delay and the transit time of PMT ……