arXiv 1706.035722017-06hep-phhep-ex

对$e^+e^-\to H+γ$的次首阶QCD修正

Next-to-leading-order QCD corrections to $e^+e^-\to H+γ$

Wen-Long Sang, Wen Chen, Feng Feng, Yu Jia, Qing-Feng Sun

备注：: v4, 11 pages, 6 figures, 2 tables; errors in Appendix are fixed; version accepted for publication at PLB
DOI：: 10.1016/j.physletb.2017.10.044

摘要：

希格斯玻色子与硬光子在轻子对撞机上的联合产生，$e^+e^-\to Hγ$在标准模型中具有相当小的截面，可以作为潜在的新物理信号的灵敏探针。类似于环诱导的希格斯衰变通道$H\to γγ, Zγ$，如果忽略微小的电子质量，则$e^+e^-\to Hγ$过程也以单环阶开始。在这项工作中，我们计算了次首阶（NLO）QCD修正的相关PDMATHAMO生产过程，这主要源于胶子敷料顶夸克圈。在较低的质心能量范围（$\sqrt{s}<300$ GeV），QCD的修正相当小，因此对CEPC等Higgs工厂的影响可以忽略不计。然而，当能量被提升到ILC能量范围（$\sqrt{s}\approx 400$ GeV）时，QCD修正可能会通过$20\%$增强首阶截面。在任何情况下，$e^+e^-\to Hγ$过程的最大产生率$σ_{\rm max}\approx 0.08$ fb都在$\sqrt{s}= 250$ GeV左右，因此CEPC是寻找这种罕见的希格斯粒子产生过程的最佳场所。在高能量极限下，非线性光学QCD修正的影响可以忽略不计，这可以简单地归因于非线性光学和线性光学截面的不同的渐近标度行为，其中前者表现出较温和的衰减$\propto 1/s$，而后者经历了快得多的衰减$\propto 1/s^2$ .

英文摘要：

The associated production of Higgs boson with a hard photon at lepton collider, i.e., $e^+e^-\to Hγ$, is known to bear a rather small cross section in Standard Model, and can serve as a sensitive probe for the potential new physics signals. Similar to the loop-induced Higgs decay channels $H\to γγ, Zγ$, the $e^+e^-\to Hγ$ process also starts at one-loop order provided that the tiny electron mass is neglected. In this work, we calculate the next-to-leading-order (NLO) QCD corrections to this associated $H+γ$ production process, which mainly stem from the gluonic dressing to the top quark loop. The QCD corrections are found to be rather modest at lower center-of-mass energy range ($\sqrt{s}<300$ GeV), thus of negligible impact on Higgs factory such as CEPC. Nevertheless, when the energy is boosted to the ILC energy range ($\sqrt{s}\approx 400$ GeV), QCD corrections may enhance the leading-order cross section by $20\%$. In any event, the $e^+e^-\to Hγ$ process has a maximal production rate $σ_{\rm max}\approx 0.08$ fb around $\sqrt{s}= 250$ GeV, thus CEPC turns out to be the best place to look for this rare Higgs production process. In the high energy limit, the effect of NLO QCD corrections become completely negligible, which can be simply attributed to the different asymptotic scaling behaviors of the LO and NLO cross sections, where the former exhibits a milder decrement $\propto 1/s$ , but the latter undergoes a much faster decrease $\propto 1/s^2$.

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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