反氢原子的电荷极限
Limit on the Electric Charge of Antihydrogen
摘要：
阿尔法合作已经成功地证明了冷反氢$\overline{\mathrm{H}}$的生产和限制。对捕获数据的分析允许对最简单的反原子的电荷进行严格的限制。已知物质的电荷中性具有非常高的精度，因此中性极限$\overline{\mathrm{H}}$提供了CPT不变性的测试。该实验技术是基于测量在电场中带电的$\overline{\mathrm{H}}$的偏转。被困的$\overline{\mathrm{H}}$原子被静电场位移的趋势进行测量和比较的结果的详细模拟的$\overline{\mathrm{H}}$动态的陷阱。系统误差进行了广泛的调查，特别注意那些由于硅顶点探测器，这是用于确定的$\overline{\mathrm{H}}$湮灭位置的设备。对$\overline{\mathrm{H}}$原子的电荷获得的极限是\mbox{$ Q = (-1.3\pm1.8\pm0.4)\times10^{-8}$}，代表了使用$\overline{\mathrm{H}}$的第一次精确测量。
英文摘要：
The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. Charge neutrality of matter is known to a very high precision, hence a neutrality limit of $\overline{\mathrm{H}}$ provides a test of CPT invariance. The experimental technique is based on the measurement of the deflection of putatively charged $\overline{\mathrm{H}}$ in an electric field. The tendency for trapped $\overline{\mathrm{H}}$ atoms to be displaced by electrostatic fields is measured and compared to the results of a detailed simulation of $\overline{\mathrm{H}}$ dynamics in the trap. An extensive survey of the systematic errors is performed, with particular attention to those due to the silicon vertex detector, which is the device used to determine the $\overline{\mathrm{H}}$ annihilation position. The limit obtained on the charge of the $\overline{\mathrm{H}}$ atom is \mbox{$ Q = (-1.3\pm1.8\pm0.4)\times10^{-8}$}, representing the first precision measurement with $\overline{\mathrm{H}}$.
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