Determination of muon momentum in the MicroBooNE LArTPC using an improved model of multiple Coulomb scattering
Determination of muon momentum in the MicroBooNE LArTPC using an improved model of multiple Coulomb scattering
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DOI：
10.1088/1748-0221/12/10/p10010
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发表时间：
2017-10-01
影响因子：
1.3
通讯作者：
Zhang, C.
中科院分区：
文献类型：
--
作者：
Abratenko, P.;Acciarri, R.;Zhang, C.
讨论了在MicroBooNE液氩时间投影室（LArTPC）中利用多次库仑散射（MCS）测量带电粒子动量的技术。该方法不需要像其他轨道动量重建方法（基于距离的动量重建和量热动量重建）那样将完整的粒子电离轨道包含在检测器体积内。我们激励使用这种技术，描述了调整的基本唯象公式，量化其性能完全包含的束中微子诱导的μ子轨道在模拟和数据中，并量化其性能退出μ子轨道在模拟中。使用模拟，我们已经表明，标准的高地公式应重新调整，特别是在液态氩中的散射，这显着提高了偏差和分辨率的动量测量。与调整的公式，我们发现数据和模拟包含的轨道之间的协议，在动量重建和分辨率的变化作为一个函数的轨道长度的一个小的偏差，提高从约10%的最短（一米长）的轨道为5%的较长（几米）的轨道。对于模拟退出μ子与至少一米的轨道包含，我们发现一个类似的小偏差，和分辨率小于15%的μ子与动量低于2 GeV/c。以上2 GeV/c，结果作为第一次估计的MCS动量测量能力的MicroBooNE高动量退出轨道。
We discuss a technique for measuring a charged particle's momentum by means of multiple Coulomb scattering (MCS) in the MicroBooNE liquid argon time projection chamber (LArTPC). This method does not require the full particle ionization track to be contained inside of the detector volume as other track momentum reconstruction methods do (range-based momentum reconstruction and calorimetric momentum reconstruction). We motivate use of this technique, describe a tuning of the underlying phenomenological formula, quantify its performance on fully contained beam-neutrino-induced muon tracks both in simulation and in data, and quantify its performance on exiting muon tracks in simulation. Using simulation, we have shown that the standard Highland formula should be re-tuned specifically for scattering in liquid argon, which significantly improves the bias and resolution of the momentum measurement. With the tuned formula, we find agreement between data and simulation for contained tracks, with a small bias in the momentum reconstruction and with resolutions that vary as a function of track length, improving from about 10% for the shortest (one meter long) tracks to 5% for longer (several meter) tracks. For simulated exiting muons with at least one meter of track contained, we find a similarly small bias, and a resolution which is less than 15% for muons with momentum below 2 GeV/c. Above 2 GeV/c, results are given as a first estimate of the MCS momentum measurement capabilities of MicroBooNE for high momentum exiting tracks.