Abstract
The BaBar detector operated successfully at the PEP-II asymmetric e+e− collider at the SLAC National Accelerator Laboratory from 1999 to 2008. This report covers upgrades, operation, and performance of the collider and the detector systems, as well as the trigger, online and offline computing, and aspects of event reconstruction since the beginning of data taking.
Highlights
The BABAR detector [1] operated at the PEP-II asymmetric eþ e−collider [2,3,4] at the SLAC National Accelerator Laboratory from 1999 to2008
The time-to-distance relations were originally parameterized as a function of distance of closest approach only, with corrections applied for azimuth and dip angles
This procedure was later replaced by a fit to the two-dimensional distribution of the distance of closest approach versus azimuth angle, with a correction for dip angle
Summary
As the end of BABAR data taking approached, it became evident that physics analyses would continue for several years. The final BABAR dataset produced with the most recent software release, referred to as R24, consists of over 9 109 reconstructed physics events and 27 109 simulated events that, including the skimmed data, are stored in 1.6 106 files. 985 Tbytes and 653 Tbytes of reconstructed real and simulated data for the two most recent software releases, R24 and the earlier. R22, both being actively used in ongoing analyses These data are referred to as Legacy data. The BABAR collaboration decided that the best way to preserve this most valuable heritage of the experiment was to create a computing system that would sustain the full analysis capability, including the preservation of the data and the reconstruction and simulation software, accompanied by detailed documentation for future users. The LTDA system will become the primary BABAR facility for data analysis
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