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Run14 Au+Au 200 GeV - T0 calibration using HFT

Updated on Mon, 2015-03-02 17:08. Originally created by mstftsm on 2015-03-02 17:06.


Regarding the T0 calibration. 

I looked at AuAu low luminosity run 15100084. 
I used events with Number_of_primary_tracks < 100 and tracks with pT>1.0 GeV. 
 
The T0 correction from residuals on PXL are negligible.
Plots can be found here: http://www.star.bnl.gov/protected/heavy/mstftsm/tpc/t0-using-HFT/

Here are the T0 calculations:

 
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T0 correction from  h_pxl_eta_Z  is  0.8+/-3.1 (μm)  ~  (2+/-6)e-05 (μs)
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T0 correction from  h_ist_eta_Z  is  (1.0+/-0.4)e+02 (μm)  ~  0.0018+/-0.0007 (μs)
--------------------------------------------------

IST resolution along Z is very 1800μm. So we rely on the residuals on PXL to conclude that T0 does not need any futher correction. 



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