Measurement of CP-Violation Parameters

CP违反参数的测量

• 批准号: 0140009
• 负责人: Michael Marx
• 金额: $ 61万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0140009&HistoricalAwards=false
• 关键词: Measurement; CP; Violation; Parameters

Recognizing an opportunity to address new physics, a strong collaboration representing 20 institutions, has formed and is proposing funding for the project entitled "Rare Symmetry Violating Processes" (RSVP). RSVP represents an opportunity to empower the university community to make discoveries of extraordinary importance. The current scope of RSVP includes 130 scientists, about 60% from the United States, and the others from Canada, Switzerland, Italy, Japan, and Russia, along with an expected 100 graduate students and post-docs.KOPIO, a component of the RSVP project, is an experiment to measure the branching ratio of the decay of a neutral K meson into a neutral pion, a neutrino, and an anti-neutrino. The interest in this decay mode is that it yields the single, most incisive determination of the parameter describing CP (or time reversal symmetry) violation involving quarks. This in turn will shed light on the reason that our Universe is populated with matter, rather than equal amounts of matter and anti-matter as expected from the naive Big Bang theory of the origin of the Universe. This matter anti-matter asymmetry, a critical factor in our origins, is one of the fundamental issues in particle physics today.

认识到解决新物理学问题的机会，一个代表20个机构的强有力的合作已经形成，并正在提议为题为“罕见的对称违反过程”(RSVP)的项目提供资金。RSVP代表着一个机会，使大学社区能够做出非常重要的发现。目前的RSVP计划包括130名科学家，其中约60%来自美国，其他来自加拿大、瑞士、意大利、日本和俄罗斯的科学家，以及预计100名研究生和博士后。作为RSVP计划的一个组成部分，KOPIO是一个测量中性K介子衰变为中性介子、中微子和反中微子的分支比的实验。这种衰变模式的有趣之处在于，它产生了描述与夸克有关的CP(或时间反转对称性)破坏的参数的单一、最深刻的确定。这反过来将阐明为什么我们的宇宙充满了物质，而不是像天真的宇宙起源大爆炸理论所预期的那样，同等数量的物质和反物质。物质反物质的不对称性是我们起源的一个关键因素，是当今粒子物理学的基本问题之一。