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Since we are starting with an unaligned detector, and pattern recognition may be affected, we make rather tight selection cuts on the event as a whole to get a good quality sample of tracks. We start with an FEE sample of roughly 600k events in which one and only one high energy cluster was found in the electromagnetic calorimeter, and one and only one track was found in the event. The V0 skim requires a cluster to have been associated with both the electron and positron tracks and the time difference between the two clusters to be less than 2ns. They were selected using the following command (in the runDir directory).:
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for i in {000..262}; do bsub -W 1:00 -R rhel60 -o /nfs/slac/g/hps_data2/data/physrun2019/skim/v0/alignment/logs/hps_010031.evio.00"$i"_v0skimForAlignment.log java -server -jar hps-distribution-4.5-SNAPSHOT-bin.jar skimV0tight.lcsim -i /nfs/slac/g/hps_data2/data/physrun2019/skim/v0/hps_010031/hps_010031.evio.00"$i"_v0skim.slcio -DoutputFile=/nfs/slac/g/hps_data2/data/physrun2019/skim/v0/alignment/hps_010031.evio.00"$i"_v0skimForAlignment -e 100; done
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We list data samples publicly available at SLAC. Samples can be made available at other locations if need be.
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