Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ

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XU Min, HE Kang-Lin, ZHANG Zi-Ping and WANG Yi-Fang. Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ[J]. Chinese Physics C, 2009, 33(6): 428-435. doi: 10.1088/1674-1137/33/6/005
XU Min, HE Kang-Lin, ZHANG Zi-Ping and WANG Yi-Fang. Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ[J]. Chinese Physics C, 2009, 33(6): 428-435.  doi: 10.1088/1674-1137/33/6/005 shu
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Received: 2008-09-09
Revised: 2008-11-25
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Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ

    Corresponding author: XU Min,

Abstract: 

This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as KS0, Λ, as well as on lifetime measurements using a 3-dimensional fit. The kinematic constraints between the production and decay vertices and the decay vertex fitting algorithm based on the least squares method are both presented. Reconstruction efficiencies including experimental resolutions are discussed. The results and systematic errors are calculated based on a Monte Carlo simulation.

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