KOPIO-Measurement of the Decay K_L -> pi0 + nu + nubar

弗吉尼亚理工学院和州立大学(VT)小组的这项提案寻求为软件和硬件项目的支持提供资金，这些项目将使测量超罕见K介子衰变的分支比K0L到P0+n+NBAR成为可能。这种衰变可能是对CP破坏的最小标准模型解释的唯一最深刻的检验。需要比目前观测到的大得多的CP破坏来解释为什么宇宙是物质主导的。因此，寻找CP违规的外来来源是很重要的。这项名为KOPIO的实验将在布鲁克海文国家实验室的交流梯度同步加速器上进行，该实验室提供最强的低能量长寿命中性K介子光束。VT小组计划使用GEANT蒙特卡罗模拟程序维护、更新和回答物理问题，并设计和建造带电粒子和伽马射线否决权探测器，这些探测器将从沿着光束总方向发射的背景衰变中捕捉粒子。研究计划的更广泛影响预计将来自该项目中将超越的重要工程问题，以及从高中到研究生的各级学生的参与。

This proposal from the Virginia Polytechnic Institute and State University (VT) group seeks funding for the support of software and hardware projects that will enable a measurement of the branching ratio of the ultra-rare K-meson decay, K0L to p0+n+nbar. This decay is perhaps the single most incisive test of the minimal Standard Model explanation of CP violation. A much larger amount of CP violation than that presently observed is needed to explain why the universe is matter dominated. It is therefore important to search for exotic sources of CP violation. The experiment, called KOPIO, will be carried out at the Brookhaven National Laboratory's Alternating Gradient Synchrotron that provides the most intense beams of low energy long-lived neutral K-mesons. The VT group plans to maintain, update and answer physics questions with the GEANT Monte Carlo simulation code and to design and construct the charged particle and gamma ray veto detectors that will catch particles from background decays emitted in the general direction of the beam.The broader impacts of the research program are expected to derive from the important engineering problems to be surpassed in the project and from the involvement of students at all levels from high school to graduate school.