K Long to PiO nu nubar Detector R and D

该提案要求支持几个实验设备的研究和开发，其目标是测量稀有KoL衰变为pom n-bar的分支比。 这种衰变通过CP（电荷共轭x宇称）破坏相互作用发生，其速率的知识将补充世界范围内通过B介子衰变观察CP破坏的研究工作。 特别是，在B衰变和K衰变中CP破坏参数之间的差异将表明CP破坏在粒子物理学的标准模型之外。 这种差异是许多扩展了明显不完整的标准模型的公式和在我们的宇宙中观察到的物质-反物质不对称性的自然结果。KOPIO实验将安装在布鲁克海文国家实验室，使用交替梯度同步加速器质子加速器作为新的极强中性K介子束的驱动器。虽然光束线组件和粒子探测器都没有超出各自技术的最新水平，但在建造之前需要进行大量的开发和详细的设计工作。

This proposal requests support for Research and Development on several experimental devices with the goal of measuring the branching ratio of the rare KoL decay into po n n-bar. This decay occurs through a CP (charge conjugation x parity) violating interaction, and knowledge of its rate will complement the worldwide research effort to observe CP violation through decay of B mesons. In particular, a difference between the CP violating parameters in B decay and those in K decay would indicate CP violation outside the Standard Model of particle physics. Such a difference would be a natural consequence of many of the formulations that extend the clearly incomplete Standard Model and of the matter-antimatter asymmetry observed in our Universe.The KOPIO experiment will be mounted at the Brookhaven National Laboratory, using the Alternate Gradient Synchrotron proton accelerator as a driver for a new, extremely intense neutral kaon beam. While neither the beamline components nor the particle detectors are beyond the state of the art in their respective technologies, significant development and detailed design work are required before construction.