CSC Validation Update Woochun Park (Univ of South Carolina) @USC - PowerPoint PPT Presentation

CSC Validation Update Woochun Park (Univ of South Carolina) @USC ATLAS Meeting 8/30/2007 1

Low Efficiency in Endcap Region R12 simul. with R13 recon. R13 simul. with R13 recon. David Adams found efficiency loss in endcap region. � New MC simulation is available in release 13.0.20. � Related to CSC detector, gas gain is reduced by factor of two to have � more realistic baseline value. We want to make sure that CSC reconstruction doesn’t have � problem for this. 2

Gas Gain Q peak Charge Q right Q left Gas gain in MC simulation was different from that in cosmic data. � The lower gain it becomes, the worse resolution we expect. � Charge threshold in the algorithm should be lowered. � Error of charge measurement in strip should be increased. � 3

Residual increased about 50% (41 microns � 62 microns) which was � expected. With 10k electrons, CSC segment efficiency is recovered. � With previous charge threshold 20k electrons, it becomes lowed by 1.5%. � But, spoiled fraction is increased compared to the previous MC. � Anyway, it’s proved that CSC is not show-stopper. � New charge error is 4510e and non-normal error is 0.552mm � Previously, 4300e and 0.57mm. � 4

TGC problem 5

To do list 13.0.20 MC should be validated further. � Struggling to analyze cosmic data. � Analysis code should be written for physics analysis in AOD/ESD � level (such as WH;W � µν; H � bjets) 6

Local workstation Bee is used for ATLAS machine successfully. � � With SLC4.5, it has 12.0.6/13.0.10/13.0.20. � All the releases are successfully installed and being used for CSC reconstruction analysis as a major machine. � Ryan plans to move his ntuples into higgs. (275Gb) � Then, beeraid1 will be 783Gb available. � Arjun and I will make Bar another ATLAS machine soon. Bar has 340 Gb. Higgs has 660Gb (will be 385Gb with Ryan’s). � Strategy: To be cost effective, purchase new machine as late as possible?? 7