The STAR Vertex Position Detector
Abstract
The 2x3 channel pseudo Vertex Position Detector (pVPD) in the STAR experiment at RHIC has been upgraded to a 2x19 channel detector in the same acceptance, called the Vertex Position Detector (VPD). This detector is fully integrated into the STAR trigger system and provides the primary input to the minimum-bias trigger in Au+Au collisions. The information from the detector is used both in the STAR Level-0 trigger and offline to measure the location of the primary collision vertex along the beam pipe and the event "start time" needed by other fast-timing detectors in STAR. The offline timing resolution of single detector channels in full-energy Au+Au collisions is ~100 ps, resulting in a start time resolution of a few tens of picoseconds and a resolution on the primary vertex location of ~1 cm.
Cite
@article{arxiv.1403.6855,
title = {The STAR Vertex Position Detector},
author = {W. J. Llope and J. Zhou and T. Nussbaum and G. W. Hoffmann and K. Asselta and J. D. Brandenburg and J. Butterworth and T. Camarda and W. Christie and H. J. Crawford and X. Dong and J. Engelage and G. Eppley and F. Geurts and J. Hammond and E. Judd and D. L. McDonald and C. Perkins and L. Ruan and J. Scheblein and J. J. Schambach and R. Soja and K. Xin and C. Yang},
journal= {arXiv preprint arXiv:1403.6855},
year = {2015}
}
Comments
15 pages, 6 figures