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在sqrt[s]=13和13.6 TeV时测量WWZ和ZH生产截面
A Hayrapetyan1, V Makarenko1, A Tumasyan1
1Yerevan Physics Institute, Yerevan, Armenia.
Physical review letters
|September 15, 2025
概括
研究人员测量了两个W玻色子和一个Z玻色子在质子对质子碰撞中的产生. 这项研究提供了第一个证据,证明13.6 TeV的triboson产生,结合结果与标准模型的预测相匹配.
科学领域:
- 高能粒子物理学 高能粒子物理学
- 量子场理论是量子场理论.
- 粒子物理学的标准模型.
背景情况:
- 大强子对撞机 (LHC) 中的质子对质子碰撞对于测试基本物理学至关重要.
- 产生多重玻色子 (WWZ和ZH) 提供了对电弱相互作用的敏感探测器.
- 之前的测量已经限制了,但没有确定在更高的能量下观察到triboson的产生.
研究的目的:
- 在质子对质子碰撞中测量WWZ和ZH生产的截面.
- 区分非共振的WWZ和ZH生产机制.
- 为了寻找在$\sqrt{s}=13.6$ TeV时生产triboson的证据.
主要方法:
- 对LHCCMS实验收集的数据进行分析.
- 选择具有四个带电子 (电子或子) 的事件.
- 同时适用于分离无共振的WWZ和ZH生产模式.
主要成果:
- 与标准模型 (SM) 预测相对应的信号强度测量在13TeV和13.6TeV.
- 观察到的 (预期的) 3.8 (2.5) 标准偏差对13.6 TeV的triboson信号的显著性.
- 包括信号强度为1.03_{-0.28}^{+0.31}$,观察 (预期) 值为4.5 (5.0).
结论:
- 建立了第一个证据,证明triboson产量在$\sqrt{s}=13.6$ TeV.
- 对于WWZ和ZH生产的综合结果与SM预测一致.
- 该测量证明了CMS实验能够探测复杂的多玻色子生产过程的能力.
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