存在理论不确定性和不可见衰变时的希格斯特性
Higgs characterisation in the presence of theoretical uncertainties and invisible decays
摘要：
虽然希格斯粒子表征计划正在顺利进行，但标准模型之外的新物理学的直接迹象仍然难以捉摸。执行一个适合的完全差分希格斯生产截面在大型强子对撞机的希格斯相关的有效运营商的子集，我们讨论了在何种程度上的理论不确定性可以限制在这样一个新的物理搜索方案的灵敏度。通过引入新的光自由度，可以有助于一个不可见的（或不可检测的）希格斯衰变宽度$h \to ϕϕ$扩展维6希格斯有效场论框架，我们展示了如何差分耦合拟合可以解开非标准模型耦合和不可见的衰变宽度的影响，目前在许多新的物理场景，如希格斯门户暗物质。包括所谓的离壳测量，一直主张作为一个灵敏的$κ$框架中的希格斯宽度的测定，我们明确表明，这种方法不提供互补的灵敏度尺度分离的新物理$Λ\gg m_h \gg m_ϕ$，这是赞成在超越标准模型的情况下，涉及天体物理学和对撞机的现象，在运行期间的LHC 1的非观测新的物理。
英文摘要：
While the Higgs characterisation programme is well underway, direct signs for new physics beyond the Standard Model remain elusive. Performing a fit of fully differential Higgs production cross sections at the LHC to a subset of Higgs-relevant effective operators, we discuss the extent to which theoretical uncertainties can limit the sensitivity in such a new physics search programme. Extending the dimension-6 Higgs Effective Field Theory framework by introducing new light degrees of freedom that can contribute to an invisible (or undetectable) Higgs decay width $h \to ϕϕ$, we show how differential coupling fits can disentangle effects from non-Standard Model couplings and an invisible decay width, as present in many new physics scenarios, such as Higgs-portal dark matter. Including the so-called off-shell measurement that has been advocated as a sensitive determination of the Higgs width in the $κ$ framework, we show explicitly that this method does not provide complementary sensitivity for scale-separated new physics $Λ\gg m_h \gg m_ϕ$, which is favoured in beyond the Standard Model scenarios that relate astrophysics and collider phenomenology in light of non-observation of new physics during run 1 of the LHC.
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