Rare Radiative Decays of the Phi Meson

将为CEBAF实验建造的探测器，用于测量Phi介子的罕见辐射衰减。这个实验是由几所大学的核物理和高能物理学家共同完成的。它获得了CEBAF项目咨询委员会的最高评级。探测器的总费用将由能源部和参与该项目的几所大学分担；这笔资金已经到位。部分支持将由NSF多学科活动办公室（OMA）提供，作为仪器开发的支持计划的一部分。实验的目的是测量π介子罕见的辐射衰减，以研究子态的夸克结构以及探测可能的对称性破坏。对万分之一的分支比的敏感性将使电荷共轭测试得到显著改进，并提供关于尚不了解的标量介子态结构的重要信息。探测器将由一个电磁量热计组成，该量热计将探测phi介子的全光子衰减模式。所申请的资金将用于建造一个带电粒子否决墙，以确保中性的最终状态，一个专用的数据采集系统，以及各种辅助设备，如合适的目标和束管以及量热计的校准系统。研究生教育是这个项目的核心但隐含的元素。

A detector that will be constructed for an experiment at CEBAF to measure rare radiative decays of the Phi Meson. The experiment is a collaborative effort involving nuclear and high-energy physicists from several universities. It has received the highest rating from the CEBAF Program Advisory Committee. The total cost of the detector will be shared with the Department of Energy and with several of the universities involved in the project; this funding is already in place. Partial support will be provided by the NSF Office of Multidisciplinary Activities (OMA) as part of an enabling initiative for instrumentation development. The goal of the experiment is to measure rare radiative decays of the phi meson in order to study the quark structure of daughter states as well as to probe possible symmetry violations. Sensitivity to branching ratios at one part in ten thousand will permit significantly improved charge conjugation tests, as well as providing important information about the structure of poorly understood scalar meson states. The detector will consist of an electromagnetic calorimeter which will detect all-photon decay modes of the phi meson. The requested funds will be used to construct a charged-particle veto wall to ensure a neutral final state, a dedicated data acquisition system, and various ancillary devices such as a suitable target and beam pipe and calibration system for the calorimeter. Graduate education is a central but implicit element in this project.