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arXiv 2012.11555hep-phhep-ex
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在甚高能轻子对撞机上实现精确的两条途径

Two Paths Towards Precision at a Very High Energy Lepton Collider

Dario Buttazzo, Roberto Franceschini, Andrea Wulzer

摘要:

我们说明了一个非常高的能量轻子对撞机(从10到30 TeV的质心能量),探索新的物理间接在矢量玻色子聚变双希格斯生产过程中,并在高能量直接diboson生产的潜力。通过对双Higgs高不变质量尾截面的测量,发现双Higgs产生在百分比水平上对反常Higgs三线性耦合敏感,在千分之一或亚千分之一水平上对Higgs复合性$ξ$参数敏感.高能双玻色子(和三玻色子)的产生在几十或几百TeV的尺度上对希格斯-轻子接触相互作用算子很敏感,对应于希格斯复合尺度的范围远高于目前正在讨论的任何其他未来对撞机项目。这一结果来自于极高能轻子对撞机在10 TeV或更高能量下测量电弱截面的独特能力,其中新物理在更高能量下的影响被放大。一般的教训是,精确物理学的标准路径,基于对高统计过程的测量,如单希格斯粒子和双希格斯粒子的产生,在非常高的能量轻子对撞机上伴随着第二种基于最高可用能量测量的策略。

英文摘要:

We illustrate the potential of a very high energy lepton collider (from 10 to 30 TeV center of mass energy) to explore new physics indirectly in the vector boson fusion double Higgs production process and in direct diboson production at high energy. Double Higgs production is found to be sensitive to the anomalous Higgs trilinear coupling at the percent level, and to the Higgs compositeness $ξ$ parameter at the per mille or sub-per mille level thanks to the measurement of the cross-section in the di-Higgs high invariant mass tail. High energy diboson (and tri-boson) production is sensitive to Higgs-lepton contact interaction operators at a scale of several tens or hundred TeV, corresponding to a reach on the Higgs compositeness scale well above the one of any other future collider project currently under discussion. This result follows from the unique capability of the very high energy lepton collider to measure Electroweak cross-sections at 10 TeV energy or more, where the effect of new physics at even higher energy is amplified. The general lesson is that the standard path towards precision physics, based on measurements of high-statistics processes such as single and double Higgs production, is accompanied at the very high energy lepton collider by a second strategy based on measurements at the highest available energy.

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