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Improved DC Calibration Performance Check with New Procedure

This study presents a new calibration procedure for DC performance evaluation, focusing on cosmic-ray time events. The efficiency for innermost 12 layers has shown promising results, warranting further comparisons with old reconstruction methods using track samples. Initial tests indicate potential enhancements in tracking efficiency and track splitting probability, with no significant changes noted in event reconstruction. Ready for official integration for broader analysis.

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Improved DC Calibration Performance Check with New Procedure

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  1. Check of new DC calib performance • A new DC calibration procedure by P. De Simone and E. De Lucia has been set up, in order to act on events independently on the incoming cosmic-ray time, measured by EmC • A first effect was observed looking at the hardware efficiency for innermost 12 layers (small cells): the efficiency drop observed wrt 2002 data disappears • Use KS p+p- sample to check tracking • Compare old reconstruction wrt what is obtained using new s-t rel. • s-t from run 30875 (26 August) • using runs 30874+30882 for a total of about 200 nb-1

  2. Check of new DC calib performance • Checking tracking efficiency (sample of KL crash + 1 trk from IP) eTRK eTRK PT(MeV/c) PT(MeV/c)

  3. Check of new DC calib performance • Checking tracking efficiency (sample of KL crash + 1 trk from IP) eTRK eTRK qTRK(degrees) qTRK(degrees)

  4. Check of new DC calib performance • Checking tracking efficiency (sample of KL crash + 1 trk from IP) eTRK eTRK NEW OLD PT(MeV/c) PT(MeV/c)

  5. Check of new DC calib performance • Checking probability to split a track • Every track assigned to 3 categories: golden, kink, other (rejected) OLD CALIB NEW CALIB • In general, fraction of rejected events tends increase for p+ more than for p-. • Difficult to say with the present statistical uncertainty if assigments became more equalized

  6. Check of new DC calib performance • No big changes appear when s-t rel. from new DC calib are used • Ready to insert it in the official reconstruction, thus allowing tests to be done on larger statistics and also using Bhabha events

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