相关实验视频
Updated: Sep 10, 2025

07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
8.6K
通过ATLAS实验在pp碰撞中寻找新出现的喷气
Reports on progress in physics. Physical Society (Great Britain)
|August 21, 2025
概括
这项研究在ATLAS实验中寻找新出现的喷流, 没有发现新粒子的证据. 这项研究排除了假设暗区介质的特定质量 (Z
科学领域:
- 高能物理
- 粒子物理学
- 暗物质的搜索
背景情况:
- 标准模型 (SM) 描述了基本粒子和力.
- 假设的暗区可能通过新的介质粒子与SM相互作用.
- 长期存在的粒子在探测器中衰变.
研究的目的:
- 为了寻找假设暗区产生喷气的证据.
- 探测中介粒子 (Z'和Φ) 连接暗区与SM.
- 根据新出现的喷气对生产,为介质质量和合物设定排除限制.
主要方法:
- 来自ATLAS实验的13.6TeV的51.8fb-1质子碰撞数据的分析.
- 具有多个移位顶点的新兴喷气对的事件.
- 通过s-channel Z'向量介质或t-channel Φ标量介质进行研究.
主要成果:
- 没有发现超出预期的SM背景的显著过剩.
- 对于特定的黑色衰变长度和合物,排除600 GeV至2550 GeV之间的Z'介质质量.
- 对于特定的合器,排除在 600 GeV 和 1375 GeV 之间的 Φ介质.
结论:
- 通过Z'介质进行了首次对新兴喷气对生产的直接搜索.
- 通过t频道标量粒子介导的新兴喷气产生的第一个研究进行了.
- 这些结果对与SM相互作用的暗板模型构成约束.
相关概念视频
Thomson's e/m Experiment
4.4K
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...
4.4K
Atomic Emission Spectroscopy: Overview
2.5K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
2.5K
Atomic Emission Spectroscopy: Instrumentation
592
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
592
Atomic Absorption Spectroscopy: Atomization Methods
662
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
662
Positron Emission Tomography
5.4K
Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
5.4K
Atomic Emission Spectroscopy: Interference
272
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
272

