报告题目：Prospects of detecting dark matter through cosmic-ray antihelium

报 告人：周宇峰（中科院理论物理研究所）

邀 请人：梁作堂

报告时间：4月3日（周三）14：00

报告地点：青岛校区N7-122

报告摘要：

Cosmic-ray (CR) antihelium is an important observable for dark matter (DM) indirect searches due to extremely low secondary backgrounds towards low energies. In a given DM model, the predicted CR antihelium flux is expected to be strongly correlated with that of CR antiprotons. In this talk, we discuss the possibility of using the AMS-02 antiproton data to constrain the DM annihilation cross section, and use the recent ALICE data on antihelium productions to determine the parameters in the coalescence model for anti-nucleus formation. The hadronic cross sections are estimated using Monte-Carlo event generators. Based on these constraints, we make predictions for the maximal antihelium flux for typical DM annihilation final states, and perform a detailed analysis on the uncertainties due to the DM density profiles and CR propagation models. We find that the results are highly insensitive to both of them. We show that with very optimistic assumptions, CR antihelium-3 is within the reach of the AMS-02 experiment. The antihelium events which can be detected by AMS-02 are likely to have kinetic energy above 30 GeV, which is consistent with the preliminary AMS-02 search results. The events which can be observed by AMS-02 are likely to arise dominantly from secondary backgrounds rather than DM interactions.

报告人简介：

周宇峰，中国科学院理论物理研究所研究员，国家自然科学基金委杰出青年基金获得者。1996年华中师范大学物理系毕业获学士学位；1999年华中师范大学粒子物理所硕士毕业.；2002年中科院理论物理研究所博士毕业.之后在德国慕尼黑大学、德国多特蒙德大学、日本高能加速器研究机构、韩国高等研究中心从事博士后工作。2009年入选中科院理论物理研究所百人计划回国工作；2018年获得国家自然科学基金委杰出青年项目资助。科研工作主要涉及超出标准模型的新物理、新物理模型中的重子-反重子不对称起源、暗物质理论、Cp对称性破缺的模型和唯象研究。