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The BABAR Prompt Reconstruction System

BABAR is an experiment designed to explore the nature of CP violation and other physics in the B B-bar system starting in the Spring of 1999. The experiment is situated at the Stanford Linear Accelerator Center where the former PEP electron-positron storage ring has been upgraded to an e{sup +}e{sup {minus}} asymmetric storage facility. The electrons at 9 GeV/c and positrons at 3.1 GeV/c will collide at the Y(4S) with a luminosity of 3 x 10{sup 33} cm{sup {minus}2} s{sup {minus}1}. The BABAR detector will record the B and B-bar decays resulting from the Y(4S). With careful vertexing, particle ID and other measurements, asymmetries between the B and B-bar decays will be analyzed. The expected data rate reaches 100 Hz of {approximately}32 kByte events recorded to mass storage. This results in {approximately}10{sup 9} logged events per year of operation. The raw data, combined with reconstructed and simulated data, is expected to yield {approximately}300 TB of stored data per year. With this large flow of data, it becomes essential to optimize the automation and reliability associated with the initial phases of data processing.