Calibration study of the X-T relation for the BESIII drift chamber
Calibration study of the X-T relation for the BESIII drift chamber
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DOI：
10.1088/1674-1137/39/2/026002
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发表时间：
2015-02
影响因子：
3.6
通讯作者：
康晓琳;伍灵慧;吴智;房双世;何康林;李卫东;李卫国;刘怀民;毛泽普;王亮亮;袁野;赵瑶;Xincai Kang;L. Wu;Z. Wu;T. Luo;C. Hu;H. Wang;S. Fang;K. He;Wenjia Li;Wei-Min Li;HM Liu;Z. Mao;Ll Wang;Y. Yuan;Y. Zhang
中科院分区：
文献类型：
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作者：
康晓琳;伍灵慧;吴智;房双世;何康林;李卫东;李卫国;刘怀民;毛泽普;王亮亮;袁野;赵瑶;Xincai Kang;L. Wu;Z. Wu;T. Luo;C. Hu;H. Wang;S. Fang;K. He;Wenjia Li;Wei-Min Li;HM Liu;Z. Mao;Ll Wang;Y. Yuan;Y. Zhang
离线定标在BESIII离线数据处理中起着重要作用。为了获得良好的空间和动量分辨率，需要对BESIII漂移室进行高精度的离线定标。本文研究了时间-距离关系，这是航迹重建的重要校准常数。进行了时间-距离关系的参数化、左右不对称性的研究以及随入射角变化的研究。为了减少经过死区附近的轨道的测量动量的漂移，特别注意死道对时间-距离关系的影响。终于来了。我们给出了来自2012年J/psi数据集的桶Bhabha事件(垂直条形cos theta垂直条形0.8)的分辨率。其平均空间分辨率为123µm，1.548 GeV/c Bhabha径迹的动量分辨率为11.9 MeV/c。
Offline calibration plays an important role in BESIII offline data processing. In order to achieve good spatial and momentum resolution, it is necessary to implement high precision offline calibration for the BESIII drift chamber. This paper studies the time-to-distance relations, which are important calibration constants for track reconstruction. The parameterization of the time-to-distance relation, studies of left-right asymmetry and studies of variation with entrance angle are performed. The impact of dead channels on the time-to-distance relation is given special attention in order to reduce the shift in measured momentum for tracks passing near dead cells. Finally. we present the resolutions for barrel Bhabha events (vertical bar cos theta vertical bar < 0.8) from a J/psi data set taken in 2012. The average spatial resolution is 123 mu m and the momentum resolution for 1.548 GeV/c Bhabha tracks is 11.9 MeV/c.