Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ

XU Min; HE Kang-Lin; ZHANG Zi-Ping; WANG Yi-Fang

doi:10.1088/1674-1137/33/6/005

Chinese Physics C> 2009, Vol. 33> Issue(6) : 428-435 DOI: 10.1088/1674-1137/33/6/005

Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ

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Abstract：
This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as K_S⁰, 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.

References

[1]

. BES0 Design Report, Interior Document in Institute ofHigh Energy Physics, 20042. Harris F A (BES Collab.). arXiv: physics/06060593. LI W D, LIU H M et al. The Offline Software for the BES0 Experiment. Proceeding of CHEP06. Mumbai, 20064. DENG Z Y et al. HEP NP, 2006, 30(5): 371-377 (inChinese)5. Agostinelli S et al (Geant4 Collab.). Nucl. Instrum. Meth-ods A, 2003, 506: 2506. XU Min. The Report on Vertex Reconstruction, July 2008,BES0 annual meeting7. Paul Avery. Fitting Theory Writeups and References8. Particle Data Group. 20089. Verkerke W, Kirkby D. RooFit Users Manual v2.07, Jan200610. ZHANG Y et al. HEP NP, 2007, 31(6): 570-575 (inChinese)11. LIU Q G et al. Chinese Physics C, 2008, 32(7): 565-57112. WANG J K. The Report on MDC Kalman Track Fitting,July 2008, BES0 annual meeting

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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

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Received: 2008-09-09
Revised: 2008-11-25

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沈阳化工大学材料科学与工程学院沈阳 110142

Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ

Corresponding author: XU Min,

Received Date: 2008-09-09
Accepted Date: 2008-11-25
Available Online: 2009-06-05

Abstract:

This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as K_S⁰, 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.