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摘要：在粒子物理标准模型里，物质和反物质有非常高的对称性，据此理论在早期宇宙会产生相等数量的粒子和反粒子，它们湮灭后，宇宙中只会留下光子和中微子。然而，我们宇宙中有很多物质：我们的身体、地球上的土壤和水、无数的恒星和星系，都是由物质构成，而不是反物质。现实中观察到的物质和反物质的不平衡是一个物理学谜团，它暗示着我们需要超出标准模型的新物理。能够解释物质和反物质不平衡的新物理可能包括重子数不守恒、轻子数不守恒、相应的电荷宇称不守恒。令人惊喜的是，大部分这些新物理假设都可以通过中微子探测器来实验检测。因此，中微子实验是比较经济的、令人期待的新物理研究方向。我将报告此领域的研究现状和我的研究经历，然后讨论中微子实验的前景和我的研究计划，以勾画出探索物质起源的研究路径。
报告人简介：叶子平博士是宾夕法尼亚大学的博士后学者，主要做SNO+中微子实验(其前身SNO实验获得2015年诺贝尔物理学奖)，他对SNO+实验寻找马约拉纳中微子的本底分析和排除做出了重要贡献。叶子平博士于2019-2022年在李政道研究所(上海交通大学)任李政道博士后研究员，他负责江门中微子实验多信使触发系统的设计和实施，同时他是南海中微子望远镜(海铃)探路者实验的主要成员，主导了PMT测量系统的设计、建造、密封测试、刻度、深海实验和数据分析工作。叶子平于2019年在美国休斯顿大学获得物理学博士学位，主要研究DarkSide暗物质探测实验，他开发了区分暗物质信号(核反冲)和探测器本底(电子反冲)的机器学习算法，计算了DarkSide的中微子本底，并研究了DarkSide探测超新星中微子的灵敏度和物理潜力。
Abstract: Matter and anti-matter are very symmetric in the current formulation of physical laws, which would result in equal amount of matter and anti-matter in early Universe, and so nothing but photons and neutrinos are left after annihilation of matter and anti-matter. However, experiments and observations revealed that the Universe is composed of matter dominant over anti-matter: our human bodies, the materials on Earth, the stars and galaxies are all made up of matter, not anti-matter. The asymmetry of matter and anti-matter in reality is a mystery, which strongly indicates that we need new physics beyond the Standard Model. The possible new physics that can explain the matter anti-matter imbalance includes baryon number violation, lepton number violation, and corresponding charge-parity violation. Interestingly, all these hypotheses can be tested with neutrino detectors. In this seminar, I will talk about the status and my experience of research in the field, and
furthermore discuss the future prospect and my plan of research for uncovering the origin of matter in the Universe.
Bios：Dr. Ziping Ye is a postdoctoral scholar at University of Pennsylvania, working on the SNO+ neutrino experiment which is an upgrade from the Nobel Prize winning SNO experiment. He made important contribution to the background analysis and rejection for the search of Majorana neutrinos with SNO+. Before joining UPenn, he was a T. D. Lee postdoctoral fellow at Tsung Dao Lee Institute (Shanghai Jiao Tong University). He played a key role in the design and implementation of the multi-messenger trigger system of JUNO. He has led several sub-systems of the TRIDENT pathfinder experiment which successfully found a site and tested deep-sea detector technologies for a world-leading neutrino telescope to be built in South China Sea. He got his physics PhD degree in 2019 from University of Houston, with a dissertation on the DarkSide dark matter search experiment.
Qiang Li