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arXiv 2407.01322hep-ph
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e-e+→4j过程中的反常三规范玻色子耦合:极化、自旋关联与干涉的作用

Anomalous triple gauge couplings in $e^-e^+\to 4j$: Role of polarizations, spin correlations and interference

Amir Subba, Ritesh K. Singh

AI总结:

本文研究了250 GeV e-e+对撞机中通过维度6算符产生的反常三规范耦合,利用四喷注末态、喷注电荷标记、增强决策树构造极化与自旋关联,并通过MCMC分析表明全强子道因干涉贡献大而比半轻子道给出更紧的限制。

摘要:

我们研究了在质心能量为250 GeV的e-e+对撞机中,通过SU(2)_l×U(1)_Y规范不变的维度6算符产生的反常带电三规范玻色子耦合,并以末态四喷注事例为研究对象。我们考虑了所有领头阶贡献,包括W-W+图与其他可能图之间的干涉贡献。利用喷注电荷对两个W玻色子与一对喷注进行标记,同时使用增强决策树将W'的衰变产物标记为up/down型,以构造极化量和自旋关联量。通过马尔可夫链蒙特卡洛分析,利用极化、自旋关联和截面获得了五个反常耦合的边缘化限制。我们发现,由于干涉贡献较大,全强子道对反常耦合给出的限制比通常追求的干净半轻子道更紧。

英文摘要:

We investigate the anomalous charged triple gauge boson couplings generated via $SU(2)_l\times U(1)_Y$ gauge invariant dimension-6 operators with final state four jet events in an $e^-e^+$ Collider at $\sqrt{s}=250$~GeV. We consider all the leading order contributions including the contribution from the interference of $W^-W^+$ diagrams with other possible diagrams. The tagging of two $W$ bosons with a pair of jets is done using the jet charge, while the decay products of $W^\prime$s are tagged as \emph{up/down}-type using boosted decision trees to construct polarizations and spin correlations. Marginalized limits on five anomalous couplings are obtained by Markov Chain Monte Carlo analysis using polarizations, spin correlations, and cross~section. We found that the full-hadronic channel provides tighter limits on anomalous couplings than compared to the usually sought-after clean semi-leptonic channel, owing to the large contribution from interference.

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