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in creator/contributor: "Fujino, D."  
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Calibration and performance of the MARK II drift chamber vertex detector

Description: We have calibrated and studied the performance of the MARK II drift chamber vertex detector with cosmic ray tracks collected with the chamber inside the MARK II detector at the SLC. The chamber achieves 30 {mu}m impact parameter resolution and 500 {mu}m track-pair resolution using CO{sub 2}/C{sub 2}H{sub 6}H{sub 6}(92/8) at 2 atmospheres pressure. The chamber has successfully recorded Z{sup 0} decays at the SLC, and resolved tracks in dense hadronic jets with good efficiency and high accuracy. … more
Date: May 1, 1990
Creator: Durrett, D.; Ford, W. T.; Hinshaw, D. A.; Rankin, P.; Smith, J. G.; Weber, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Recent experience with backgrounds at the SLC

Description: During the 1990 SLC/Mark II runs, machine backgrounds visible in the new vertex detectors were studied. These detectors had active elements at radii from 3 to 17 cm and were subjected to backgrounds unique to linear colliders. We describe recent progress in identifying sources and developing control techniques. 4 refs., 3 figs.
Date: May 1, 1991
Creator: Jacobsen, R.; Band, H.; Barklow, T.; Bazarko, A.; Brown, K.; Burke, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of the B hadron lifetime at the SLC

Description: We have measured the average B hadron lifetime from Z{sup 0} {r arrow} b{bar b} events using the Mark II detector at the SLC. We use an impact parameter tag, requiring two or more tracks with significant impact parameter ({delta}) in a hemisphere, to obtain a 40% efficiency and an 80% B-purity. The {Sigma}{delta} distribution from charged tracks in the hemisphere opposite the tag is used to fit for {tau}{sub b}. From 53 tagged B decays we find {tau}{sub b} = 1.63{sub {minus}0.40}{sup +0.64}(sta… more
Date: November 1, 1991
Creator: Fujino, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of the B hadron lifetime at the SLC

Description: We have measured the average B hadron lifetime from Z{sup 0} {r_arrow} b{bar b} events using the Mark II detector at the SLC. We use an impact parameter tag, requiring two or more tracks with significant impact parameter ({delta}) in a hemisphere, to obtain a 40% efficiency and an 80% B-purity. The {Sigma}{delta} distribution from charged tracks in the hemisphere opposite the tag is used to fit for {tau}{sub b}. From 53 tagged B decays we find {tau}{sub b} = 1.63{sub {minus}0.40}{sup +0.64}(sta… more
Date: November 1, 1991
Creator: Fujino, D. & Collaboration., The MARK II
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Mark II Vertex Drift Chamber

Description: We have completed constructing and begun operating the Mark II Drift Chamber Vertex Detector. The chamber, based on a modified jet cell design, achieves 30 {mu}m spatial resolution and <1000 {mu}m track-pair resolution in pressurized CO{sub 2} gas mixtures. Special emphasis has been placed on controlling systematic errors including the use of novel construction techniques which permit accurate wire placement. Chamber performance has been studied with cosmic ray tracks collected with the chamber… more
Date: March 1, 1989
Creator: Alexander, J. P.; Baggs, R.; Fujino, D.; Hayes, K.; Hoard, C.; Hower, N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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