Vertex Reconstruction Using a Single Layer Silicon Detector

Details Vertex Reconstruction Using a Single Layer Silicon Detector Vertex Reconstruction Using a Single Layer Silicon Detector

2006-12-06

arxiv.org/abs/nucl-ex/0612005v1

Nucl.Instrum.Meth.A570:536-542,2007

Physics

Nuclear Physics

Nuclear Experiment

accepted for publication in Nucl. Instr. Meth. A

Scientific paper

10.1016/j.nima.2006.10.355

Typical vertex finding algorithms use reconstructed tracks, registered in a multi-layer detector, which directly point to the common point of origin. A detector with a single layer of silicon sensors registers the passage of primary particles only in one place. Nevertheless, the information available from these hits can also be used to estimate the vertex position, when the geometrical properties of silicon sensors and the measured ionization energy losses of the particles are fully exploited. In this paper the algorithm used for this purpose in the PHOBOS experiment is described. The vertex reconstruction performance is studied using simulations and compared with results obtained from real data. The very large acceptance of a single-layered multiplicity detector permits vertex reconstruction for low multiplicity events where other methods, using small acceptance subdetectors, fail because of insufficient number of registered primary tracks.

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