相关实验视频
Updated: Jul 19, 2025

07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
8.6K
来自LUX-ZEPLIN (LZ) 实验的第一个暗物质搜索结果
J Aalbers1,2, D S Akerib1,2, C W Akerlof3
1SLAC National Accelerator Laboratory, Menlo Park, California 94025-7015, USA.
Physical review letters
|August 11, 2023
概括
卢克斯-泽普林实验寻找暗物质粒子,称为弱相互作用的大质粒子 (WIMPs). 该实验没有发现WIMP信号,为WIMP与原子核相互作用设定了新的限制.
科学领域:
- 粒子物理学 粒子物理学
- 宇宙学的宇宙学是什么?
- 天体物理学 天体物理学
背景情况:
- 暗物质仍然是现代物理学中最重要的奥秘之一.
- 微弱相互作用的大质粒子 (WIMPs) 是暗物质的领先候选者.
- 检测WIMP需要高度敏感的实验,保护其免受背景辐射.
研究的目的:
- 使用LUX-ZEPLIN (LZ) 暗物质探测器进行首次对WIMP的搜索.
- 为WIMP-核子和WIMP-质子截面设置新的限制.
- 为了探测WIMP质量超过9GeV/c2.2.
主要方法:
- 在桑福德地下研究设施使用双相时间投影室.
- 在60个活日内收集的数据具有5.5t的信托质量.
- 进行了概率分析,以区分潜在的WIMP信号和背景事件.
主要成果:
- LZ实验的数据与仅背景假设一致,表明没有WIMP检测.
- 对自旋独立的WIMP核子,自旋依赖的WIMP中子和自旋依赖的WIMP质子截面建立了新的排除限制.
- 对于质量为36 GeV/c2的WIMP,最严格的限制是对自旋独立散射的限制,不包括超过9.2×10−48 cm2的截面,在90%的置信水平下.
结论:
- LZ实验为某些质量范围提供了迄今为止最敏感的WIMP搜索结果.
- 缺少WIMP信号对流行的暗物质模型造成了限制.
- 随着暴露的增加,未来的分析将进一步提高LZ实验的敏感性.
相关概念视频
Detection of Black Holes
2.2K
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
2.2K
Lenz's Law
4.0K
The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux...
If a bar magnet is moved toward a coil such that the magnetic flux...
4.0K
Thomson's e/m Experiment
3.8K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
3.8K
Reduced Mass Coordinates: Isolated Two-body Problem
1.4K
In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
1.4K

