03/07
2023
Seminar
- Title题目 Challenges for a QCD Axion at the 10 MeV Scale
- Speaker报告人 刘佳 (北京大学)
- Date日期 2023年3月7日 10:00
- Venue地点 北楼 322
Abstract摘要
We report on an interesting realization of the QCD axion, with mass in the range O(10) MeV. It has previously been shown that although this scenario is stringently constrained from multiple sources, the model remains viable for a range of parameters that leads to an explanation of the Atomki experiment anomaly. In this article we study in more detail the additional constraints proceeding from recent low energy experiments and study the compatibility of the allowed parameter space with the one leading to consistency of the most recent measurements of the electron anomalous magnetic moment and the fine structure constant. We further provide an ultraviolet completion of this axion variant and show the conditions under which it may lead to the observed quark masses and CKM mixing angles, and remain consistent with experimental constraints on the extended scalar sector appearing in this Standard Model extension. In particular, the decay of the Standard Model-like Higgs boson into two light axions may be relevant and leads to a novel Higgs boson signature that may be searched for at the LHC in the near future.
报告人简介
刘佳，北京大学物理学院研究员，博雅青年学者。本科毕业于清华大学，硕士毕业于北京大学，博士毕业于纽约大学，之后在德国美因茨大学和芝加哥大学做博士后研究。从事粒子物理理论研究，研究方向为高能物理唯象学和粒子天体物理等。
邀请人 郭奉坤 研究员
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