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用于矢量玻色子融合产生双希格斯过程模拟的精度工具

Precision tools for the simulation of double-Higgs production via vector-boson fusion

Barbara Jäger, Alexander Karlberg, Simon Reinhardt

备注：
22 pages, code can be obtained from https://powhegbox.mib.infn.it/. This version corresponds to the one published in JHEP. Compared to V1 it includes a discussion of the interplay of non-factorisable corrections and anomalous couplings. The technical details of the implementation has also been extended significantly
发表信息：
JHEP 06 (2025) 022
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AI总结：

本研究在kappa框架下开发了POWHEG BOX的NLO+PS模拟工具并扩展proVBFHH程序，用于非标准耦合下矢量玻色子融合双希格斯产生的高精度模拟，验证了近似精度并分析了耦合敏感性。

摘要：

我们提出了两种用于模拟矢量玻色子融合产生希格斯对过程的精度工具，该过程在用于参数化非标准希格斯耦合的kappa框架下开展研究。我们在POWHEG BOX程序框架内开发了该过程的全新实现，可用于提供与部分子簇射（PS）匹配的QCD次领头阶（NLO）预言。此外，现有的用于计算QCD次次领头阶（NNLO）和QCD次次次领头阶修正的proVBFHH程序得到了扩展，可处理与标准模型预期不同的希格斯耦合取值。我们系统比较并分析了两个程序得到的预言，发现对于标记喷注和希格斯玻色子的可观测物理量，NLO+PS预言能够很好地近似NNLO结果。研究表明，这些结果对修改后的希格斯耦合取值非常敏感。最后，我们研究了存在反常耦合时该过程的非因子化NNLO QCD修正，发现非因子化修正的大小对反常耦合极为敏感。

英文摘要：

We present two precision tools for the simulation of Higgs-pair production via vector-boson fusion in the kappa framework for the parameterization of non-standard Higgs couplings. A new implementation of the process is developed in the framework of the POWHEG BOX program that can be used to provide predictions at the next-to-leading order (NLO) of QCD matched to parton showers (PS). In addition, the existing proVBFHH program for the computation of next-to-next-to-leading order (NNLO) QCD and next-to-next-to-next-to-leading order QCD corrections is extended to account for values of the Higgs couplings different from the expectation of the Standard Model. We systematically compare and analyse predictions obtained with the two programs and find that the NLO+PS predictions provide a good approximation of the NNLO results for observables of the tagging jets and Higgs bosons. The results turn out to be very sensitive to the values of the modified Higgs couplings. Finally we study the non-factorizable NNLO QCD corrections to the process in the presence of anomalous couplings. We find that the size of the non-factorizable corrections is very sensitive to the anomalous couplings.

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