HARP TPC的绝对动量标定
Absolute Momentum Calibration of the HARP TPC
摘要：
在HARP实验中，大角度谱仪使用圆柱形TPC作为主要的跟踪和粒子识别探测器。在HARP测量质子与核靶大角度相互作用中带电π介子的双微分产生截面时，TPC中重构径迹的动量尺度是大多数运动仓最重要的系统误差。HARP TPC在运行时存在一些硬件缺陷和操作错误。因此，重要的是控制和表征其动量校准。虽然不可能将直接粒子束输入TPC的敏感体积中以校准检测器，但是利用一组物理过程和检测器特性来实现设备的精确校准。在下文中，我们回顾了关于HARP TPC中动量测量的主要问题，并描述了为验证动量尺度而进行的交叉检查。结果表明，动量的测量在3%的精度范围内是正确的。
英文摘要：
In the HARP experiment the large-angle spectrometer is using a cylindrical TPC as main tracking and particle identification detector. The momentum scale of reconstructed tracks in the TPC is the most important systematic error for the majority of kinematic bins used for the HARP measurements of the double-differential production cross-section of charged pions in proton interactions on nuclear targets at large angle. The HARP TPC operated with a number of hardware shortfalls and operational mistakes. Thus it was important to control and characterize its momentum calibration. While it was not possible to enter a direct particle beam into the sensitive volume of the TPC to calibrate the detector, a set of physical processes and detector properties were exploited to achieve a precise calibration of the apparatus. In the following we recall the main issues concerning the momentum measurement in the HARP TPC, and describe the cross-checks made to validate the momentum scale. As a conclusion, this analysis demonstrates that the measurement of momentum is correct within the published precision of 3%.
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