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arXiv 1805.03417hep-phhep-ex
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正负电子对撞机三重Higgs耦合的偏振束间接测量

Indirect measurement of triple-Higgs coupling at an electron-positron collider with polarized beams

Saurabh D. Rindani, Balbeer Singh

摘要:

我们研究了在$e^+e^-$对撞机上使用极化光束产生单希格斯粒子来间接测量或约束可能的异常三希格斯耦合的可能性,这可以通过单回路图对该过程做出贡献。在主导过程$e^+e^- \to ZH$中,纵向偏振光束可以导致分别对于$-0.8$和$+0.3$的$e^-$和$e^+$偏振的横截面的50%的改善。这相当于在质心能量为250 GeV和积分亮度光度为2 ab $^{-1}$的情况下,对三重希格斯耦合的灵敏度提高了约18\%,这是一个强的光束偏振情况。这也意味着,与非偏振光束相比,偏振光束获得特定灵敏度所需的亮度约低33%。即使当只有$e^-$光束被偏振$-0.8$时,灵敏度的提高也约为8%。我们还研究了纵向光束偏振对三重Higgs耦合的灵敏度的影响,通过次优势过程$e^+e^- \to H ν\bar ν$通过$WW$融合产生Higgs。

英文摘要:

We examine the possibility of using single-Higgs production at an $e^+e^-$ collider with polarized beams to measure, or constrain, indirectly a possible anomalous triple-Higgs coupling, which can contribute to the process via one-loop diagrams. In the dominant process $e^+e^- \to ZH$, longitudinally polarized beams can lead to an improvement in the cross section by 50\% for $e^-$ and $e^+$ polarizations of $-0.8$ and $+0.3$, respectively. This corresponds to an improvement in the sensitivity to the triple-Higgs coupling of about 18\% for a centre-of-mass energy of 250 GeV and an integrated luminosity of 2 ab$^{-1}$, making a strong case of beam polarization. This also implies that with polarized beams, the luminosity needed to get a particular sensitivity is less by about 33\% as compared to that needed with unpolarized beams. Even when only the $e^-$ beam is polarized $-0.8$, the improvement in the sensitivity is about 8\%. We also study the effect of longitudinal beam polarization on the sensitivity to the triple-Higgs coupling of Higgs production through the subdominant process $e^+e^- \to H ν\bar ν$ occurring through $WW$ fusion.

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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