K Long to PiO nu nubar Detector R and D

本提案要求支持几个实验装置的研究和开发，目的是测量稀有的KoL衰变成po和n-bar的分支比。这种衰变是通过违反CP（电荷共轭x宇称）的相互作用发生的，对其速率的了解将补充世界范围内通过B介子衰变观察CP违反的研究工作。特别是，B衰变和K衰变的CP违反参数之间的差异将表明粒子物理标准模型之外的CP违反。这种差异将是许多扩展明显不完整的标准模型的公式以及在我们的宇宙中观察到的物质-反物质不对称的自然结果。KOPIO实验将在布鲁克海文国家实验室进行，使用交替梯度同步加速器质子加速器作为一种新的、极强的中性卡介子束的驱动器。虽然光束线组件和粒子探测器在各自的技术方面都没有超越最先进的水平，但在施工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.