We study QCD corrections to the process where a Higgs boson is produced in weak boson fusion and then decays into a pair of massive $b$ quarks. We find that typical experimental criteria used to identify $b$ jets in this process affect QCD corrections to the decay, making it necessary to account for them in the proper description of this process. Indeed, if corrections to the production and decay are combined, the fiducial cross section of the weak boson fusion process $pp\to H(\to b\overline{b})jj$ is reduced by about 40% relative to leading-order predictions, compared to just about 8% if only corrections to the production process are considered. We investigate the origin of these large corrections through next-to-next-to-leading order and conclude that they appear because a number of independent moderately large effects conspire to significantly reduce the fiducial cross section for this process.

中文翻译：

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QCD 修正弱玻色子聚变中希格斯玻色子的产生和 H→bb´ 衰变


我们研究 QCD 校正过程，其中希格斯 < $b$ 0>奥色子是在弱玻色子聚变中产生的，然后衰变成一对巨大的b夸克。我们发现，用于识别该过程中 b 射流的典型实验标准会影响对衰变的 QCD 校正，因此有必要在该过程的正确描述中考虑它们。事实上，如果将产生和衰变的修正结合起来，弱玻色子聚变过程的基准横截面 $pp\to H(\to b\overline{b})jj$ 相对于领先订单预测减少了约 40%，而如果仅考虑对生产过程的修正，则减少了约 8%。我们通过从下到下的领先顺序调查这些大修正的起源，并得出结论，它们的出现是因为许多独立的中等大的效应共同显着减少了该过程的基准横截面。