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arXiv 2303.05974hep-ex
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利用大型强子对撞机(LHC)上的ATLAS探测器,通过H→b\bar{b}衰变的t\bar{t}H和tH事件探究顶夸克-希格斯汤川耦合的CP性质

Probing the $CP$ nature of the top-Higgs Yukawa coupling in $t\bar{t}H$ and $tH$ events with $H \to b\bar{b}$ decays using the ATLAS detector at the LHC

ATLAS Collaboration

AI总结:

本研究利用LHC的ATLAS实验139 fb⁻¹的13 TeV质子-质子碰撞数据,通过t\bar{t}H和tH产生模式下H→b\bar{b}衰变事件,探测顶夸克-希格斯汤川耦合的CP性质,测得CP混合角α=11°₋₇₃°⁺⁵²°。

摘要:

本研究利用大型强子对撞机(LHC)上ATLAS实验记录的、质心系能量√s=13 TeV的139 fb⁻¹质子-质子碰撞数据,探究希格斯玻色子与顶夸克之间耦合的CP性质。研究在希格斯玻色子衰变产生一对b夸克、且希格斯玻色子与一对顶夸克(t\bar{t}H)或单个顶夸克(tH)协同产生的事件中,探测顶夸克-希格斯玻色子汤川耦合的CP结构。测量采用包含1个或2个电子或μ子的事件。在顶夸克-希格斯汤川耦合存在CP奇混合成分的标准模型扩展框架中,测得CP偶耦合与CP奇耦合之间的混合角为α=11°₋₇₃°⁺⁵²°。

英文摘要:

The $CP$ properties of the coupling between the Higgs boson and the top quark are investigated with 139 fb$^{-1}$ of proton-proton collision data recorded by the ATLAS experiment at the LHC at a centre-of-mass energy of $\sqrt{s}=13$ TeV. The $CP$ structure of the top quark-Higgs boson Yukawa coupling is probed in events with a Higgs boson decaying into a pair of $b$-quarks and produced in association with either a pair of top quarks, $t\bar{t}H$, or a single top quark, $tH$. Events containing one or two electrons or muons are used for the measurement. In an extension of the Standard Model with a $CP$-odd admixture to the top-Higgs Yukawa coupling, the mixing angle between $CP$-even and $CP$-odd couplings is measured to be $α=11\,^{\circ+52^{\circ}}_{ -73^{\circ}}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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