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As the PEP-II luminosity increases the BABAR trigger and dataflow systems must accomodate the increasing data rate. A significant source of background events at the first trigger level comes from beam particle interactions with the beampipe and synchrotron masks, which are separated from the interaction region by more than 20 cm. The BABAR trigger upgrade will provide 3D tracking capabilities at the first trigger level in order to remove background events by distinguishing the origin ofdoi:10.2172/826940 fatcat:6wvghy2gbreiriuhmfywjhgmam