T. Behnke

The central tracking detectors for D

Abstract Three types of drift chambers are being constructed for the Fermilab Do experiment. The construction and readout of these chambers stress good spatial resolution, good two hit separation, and d E /d x measurement. A 106 MHz FADC system with hardware zero suppression is being constructed to read out this system.

The use of waveform digitizers with drift chambers for D0

Abstract A prototype drift chamber cell with good space resolution, d E d x , and two particle separation has been constructed. A 100 MHz, 11 bit waveform digitizer readout scheme has been used for the tests.

Rapidity gaps between jets in pp-bar collisions at sqrt s =1.8 TeV.

First experimental results are presented from a search for events with a rapidity gap between jets. The D0 detector was used to examine events produced by the Fermilab Tevatron [ital p[bar p]] collider at [radical][ital s] =1.8 TeV. The fraction of events with an observed rapidity gap between the two highest transverse energy ([ital E][sub [ital T]]) jets is measured as a function of the pseudorapidity separation between the jet edges ([Delta][eta][sub [ital c]]). An upper limit at the 95% confidence level of 1.1[times]10[sup [minus]2] is obtained on the fraction of events with non particles between the jets, for events with [Delta][eta][sub [ital c]][gt]3 and jet [ital E][sub [ital T]] greater than 30 GeV.

Rapidity gaps between jets in [ital p[bar p]] collisions at [radical][ital s] =1. 8 TeV

First experimental results are presented from a search for events with a rapidity gap between jets. The D0 detector was used to examine events produced by the Fermilab Tevatron [ital p[bar p]] collider at [radical][ital s] =1.8 TeV. The fraction of events with an observed rapidity gap between the two highest transverse energy ([ital E][sub [ital T]]) jets is measured as a function of the pseudorapidity separation between the jet edges ([Delta][eta][sub [ital c]]). An upper limit at the 95% confidence level of 1.1[times]10[sup [minus]2] is obtained on the fraction of events with non particles between the jets, for events with [Delta][eta][sub [ital c]][gt]3 and jet [ital E][sub [ital T]] greater than 30 GeV.