David R. Quarrie

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BABAR, the detector for the SLAC PEP-II asymmetric e þ e À B Factory operating at the Uð4SÞ resonance, was designed to allow comprehensive studies of CP-violation in B-meson decays. Charged particle tracks are measured in a multi-layer silicon vertex tracker surrounded by a cylindrical wire drift chamber. Electromagnetic showers from electrons and photons(More)
The Atlas collaboration at CERN[1] has adopted the Gaudi software architecture which belongs to the blackboard family: data objects produced by knowledge sources (e.g. reconstruction modules) are posted to a common in-memory data base from where other modules can access them and produce new data objects. The StoreGate has been designed, based on the Atlas(More)
The BaBar database has pioneered the use of a commercial ODBMS within the HEP community. The unique object-oriented architecture of Objectivity/DB has made it possible to manage over 700 terabytes of production data generated since May'99, making the BaBar database the world's largest known database. The ongoing development includes new features, addressing(More)
Developers and users of high-performance distributed systems often observe performance problems, the reasons for which are rarely obvious. Bottlenecks can occur in any of the components along the paths through which the data flows: the applications, the operating systems, the hosts, or the network. We have developed a methodology, known as NetLogger, for(More)
We describe the initial work of the PASS Project which uses techniques from distributed object manag-ment to analyze experimental data from high energy physics. A t this time, we have designed two prototypes to analyze high energy physics data from the CDF experiment at Fermi Lab. The data from this experiment consists of ((events " which describe particle(More)
We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23x10(6) Upsilon(4S)-->BbarB decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we find events in which one neutral B meson is fully reconstructed in a CP(More)
Grid monitoring is the measurement and publication of the state of a Grid component at a particular point in time. To be effective, monitoring must be " end-to-end " , meaning that all components between the application endpoints must be monitored. Monitoring is required for a number of purposes, including status checking, troubleshooting, performance(More)