1. Chaouki Boulahouache 01/20, 2010 Slide 1 Static Vs. Dynamic Pedestals Chaouki Boulahouache Rice University DPG Meeting  What are the effects of the static pedestals on the residuals?  What are the effects of calibration on the residuals using the static pedestals?

2. Static vs. Dynamic Pedestals Chaouki Boulahouache Slide 2  Still using the SuperPointing skim of the CRAFT09 data…  Cuts: 1) SUMQ(3x3) > 250 2) Estimated error of the position within strips < 0.2 3) |dx/dz| < 0.15 4) CSCLike Segments 5) Require 6 hits segments.  For more information, these are links to previous talks with information on the cuts.  http://indico.cern.ch/getFile.py/access?contribId=2&resId=1&materialId=slides&con fId=71472 http://indico.cern.ch/getFile.py/access?contribId=2&resId=1&materialId=slides&con fId=71472  http://indico.cern.ch/getFile.py/access?contribId=5&resId=1&materialId=slides&con fId=73695 http://indico.cern.ch/getFile.py/access?contribId=5&resId=1&materialId=slides&con fId=73695 Reminder

3. Static vs. Dynamic Pedestals Chaouki Boulahouache Slide 3  With Calibration  No Calibration  NB: These distributions are obtained using the same data files.  More segments are built? Comparison between the use of Static and Dynamic Pedestals

4. Static vs. Dynamic Pedestals Chaouki Boulahouache Slide 4 Effect of the Static Pedestals  Static pedestals greatly improve the residuals (biggest effect is ~ 30%).  Applying the calibration using the dynamic pedestals does not affect the residuals.  Applying the calibration using the static pedestals slightly worsens the residuals  Calibration constants are obtained using dynamic pedestals?

5. Static vs. Dynamic Pedestals Chaouki Boulahouache Slide 5  Residuals versus the position within strip: we see the expected behavior, i.e. residuals are worse at the center of the strip and better at the edge.  Similar results were obtained and soucmented in this note, by A. Drozdetskiy et al., CMS NOTE 2007/023.  Thanks to Andrey for pointing me to the note. Residuals Vs Position Within Strip…

6. Static vs. Dynamic Pedestals Chaouki Boulahouache Slide 6  CSCRecHitD has the following two input configuration parameters: useCalib and useStaticPedestals.  In principle they should be independent.  But if useCalib == false and useStaticPedestals == true  job crashes.  Reason: no handle on the conditions database to get the pedestals.  Solution  void CSCRecHitDProducer::produce: add: if ( useCalib || useStaticPedestals) { recoConditions_->initializeEvent( setup ); } Remark: a correction needed for CSCRecHit code…

7. Static vs. Dynamic Pedestals  Calibration constants do not improve the resolution when using dynamic or static pedestals BUT  The use of static pedestals improves the resolution. Slide 7 Conclusion

8. Static vs. Dynamic Pedestals Chaouki Boulahouache Slide 8 Residuals Vs Position Within Strip…

9. Static vs. Dynamic Pedestals Chaouki Boulahouache Slide 9  With Calibration  No Calibration Comparison between the use of Static and Dynamic Pedestals