Workflow
粒子物理标准模型
icon
Search documents
希格斯玻色子衰变为缪子对再现新证据
Ke Ji Ri Bao· 2025-09-04 09:43
第一种过程为希格斯玻色子衰变为一对缪子,平均每5000次希格斯衰变仅发生一次。但它为研究希格斯 场与第二代费米子(缪子和中微子)的耦合提供了关键窗口,有助于揭示这些粒子的质量来源。此前, 科学家仅确认了希格斯玻色子与第三代粒子(如陶子)之间的相互作用。 第二种过程是希格斯玻色子衰变为Z玻色子和光子,其中Z玻色子会进一步衰变为电子或缪子对,该衰 变机制涉及由虚粒子构成的中间"环"。若存在未知的新粒子参与该过程,便可能揭示超越粒子物理标准 模型的新物理。 此前,ATLAS合作组观测到希格斯玻色子衰变为缪子对的初步迹象,显著性为2个标准差。如今, ATLAS合作组将该过程的证据显著性提高至3.4个标准差,即随机误差概率低于三千分之一。他们对希 格斯玻色子衰变为Z玻色子和光子的过程,也给出了迄今最严格的灵敏度上限。(记者刘霞) 欧洲核子研究中心(CERN)超环面仪器实验(ATLAS)合作组宣布,他们发现了希格斯玻色子衰变为 缪子对的新证据,比之前的观测结果显著性更强。这种罕见的现象,有助于科学家更深入地理解粒子如 何获得质量。 研究团队表示,他们还在探测另一种更罕见的衰变过程——希格斯玻色子衰变为Z玻色子和光子方面取 ...
暗物质可探测参数空间扩宽两个数量级
Ke Ji Ri Bao· 2025-08-11 01:08
Core Viewpoint - The research conducted by the University of Science and Technology of China, in collaboration with international partners, successfully expands the parameter space for direct detection of strongly interacting dark matter using data from the James Webb Space Telescope, overcoming limitations of ground experiments [1][2] Group 1: Research Findings - The study reveals that detecting the nature of dark matter is crucial for enhancing the particle physics standard model and understanding the formation and evolution of the universe [1] - Ground experiments have blind spots for detecting strongly interacting dark matter, which this research addresses by utilizing the near-infrared spectrometer's dark images from the James Webb Space Telescope [1] - A new image processing method was proposed to effectively eliminate high-energy event interference, resulting in new constraints on dark matter detection [1] Group 2: Implications and Future Applications - The research highlights the unique advantages and feasibility of space-based detectors for strongly interacting dark matter [2] - The analysis methods developed can be applied to data from other space telescopes, providing a solid theoretical foundation for the design and data processing of future space dark matter detectors [2] - This work is expected to play a significant role in the field of direct dark matter detection [2]