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Tightened selections and prescale for the DstToD0Pi_DOToPiPiPi PID line

Marcelo Bovill requested to merge mbovill/DstToD0Pi_DOToKPiPiPi into master

Added a cut on the Dstar's DOCA, tightened the mass cuts and tightened the prescale from 0.1 to 0.02 for the DstToD0Pi_DOToPiPiPi line.

The cuts reduce the events in a sample of minbias MC by ~40 %, which along with the factor 5 decrease in the prescale, gives a factor ~8 reduction in the events. Based on the latest rate/bandwidth tests, this would bring the rate from ~0.433 to ~0.05 kHz.

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