The P2 experiment

The P2 experiment
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P2实验

DOI:
10.1140/epja/i2018-12611-6
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发表时间:
2018
期刊:
The European Physical Journal A
影响因子:
--
通讯作者:
D. Becker
D. Becker
中科院分区:
--
文献类型:
--
作者:
D. Becker

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我们描述了 P2 实验的研发工作,该实验旨在高精度确定 GeV2 四动量传递时的弱混合角,精度为 0.15%。这种精度与 theZpole 的现有测量相当,允许对质量规模高达 50 TeV(可扩展到 60 TeV)的标准模型进行灵敏测试。弱混合角与质子的弱电荷有关,质子的弱电荷将从弹性电子-质子散射中宇称破坏截面不对称性的测量中提取。使用 150μA 极化电子束撞击 60 cm 液氢靶,在 11000 小时的测量时间内可实现总精度。 P2 不对称性比迄今为止在电子散射中测得的任何不对称性都要小,其精确度达到了前所未有的目标。使用 100% 合格率的螺线管光谱仪以及原子氢陷阱旋光计是新功能,以前从未在宇称破坏实验中使用过。为了收集该测量所需的大量统计数据,新的美因茨能量回收超导加速器(MESA)正在建设中。本文还描述了相关光束控制系统和偏振测量的计划。需要设计和建造噪音水平极低至10 ppm的液氢高功率靶。我们还报告了 P2 光谱仪、切伦科夫探测器、集成读出电子设备以及超薄、快速跟踪探测器的概念设计。 MESA 设施的物理项目包括对标准模型之外的物理的间接、高精度搜索、核物理中中子分布的测量、单自旋不对称性以及未来可能扩展到强子宇称破坏测量。
We describe the research and development work for the P2 experiment which aims for a high precision determination of the weak mixing angleto a precision of 0.15% at a four-momentum transfer ofGeV2. This accuracy, comparable to existing measurements at theZpole, allows for a sensitive test of the Standard Model up to a mass scale of 50 TeV, extendable to 60 TeV. The weak mixing angle is connected to the weak charge of the proton which will be extracted from a measurement of the parity violating cross section asymmetryin elastic electron-proton scattering. A total accuracy ofis achievable in a measurement time of 11000 h using a 150μA polarized electron beam impinging on a 60 cm liquid hydrogen target. The P2 asymmetry is smaller than any asymmetry measured so far in electron scattering with an unprecedented goal for the accuracy. The use of a solenoid spectrometer with 100%-acceptance as well as an atomic hydrogen trap polarimeter are new features, which have never before been used in parity-violation experiments. In order to collect the enormous statistics required for this measurement, the new Mainz Energy-Recovering Superconducting Accelerator (MESA) is under construction. Plans for the associated beam control system and the polarimetry are described in this article as well. A liquid hydrogen high-power target with an extremely low noise level of 10 ppm needs to be designed and constructed. We report in addition on the conceptual design of the P2 spectrometer, its Cherenkov detectors, the integrating read-out electronics as well as the ultra-thin, fast tracking detectors. The physics program of the MESA facility comprises indirect, high precision search for physics beyond the Standard Model, measurement of the neutron distribution in nuclear physics, single-spin asymmetries, and a possible future extension to the measurement of hadronic parity violation.
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