New constraints on dark matter effective theories from standard model loops.
New constraints on dark matter effective theories from standard model loops.
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DOI：
10.1103/physrevlett.112.191304
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发表时间：
2014-02
影响因子：
8.6
通讯作者：
A. Crivellin;Francesco D’Eramo;M. Procura
中科院分区：
文献类型：
--
作者：
A. Crivellin;Francesco D’Eramo;M. Procura
考虑了规范单重态Dirac暗物质粒子通过有效算符与标准模型场相互作用的有效场论。我们进行了一个系统的分析的主导环的贡献，自旋无关的狄拉克暗物质核子散射使用之间的重正化群演化的Λ和低能量标度探测的直接检测实验。我们发现，电弱相互作用诱导运营商混合，这样的运营商是天真的速度抑制和自旋相关的，实际上可以有助于自旋无关的散射。这使我们能够对威尔逊系数施加新的约束，而这些约束到目前为止还没有被直接检测所限制。当前搜索的约束已经明显强于大型强子对撞机的约束，并且将在不久的将来得到改善。有趣的是，即使基本理论是同位旋守恒的，我们发现的环路贡献也是同位旋破坏的。
We consider an effective field theory for a gauge singlet Dirac dark matter particle interacting with the standard model fields via effective operators suppressed by the scale Λ ≳ 1 TeV. We perform a systematic analysis of the leading loop contributions to spin-independent Dirac dark matter-nucleon scattering using renormalization group evolution between Λ and the low-energy scale probed by direct detection experiments. We find that electroweak interactions induce operator mixings such that operators that are naively velocity suppressed and spin dependent can actually contribute to spin-independent scattering. This allows us to put novel constraints on Wilson coefficients that were so far poorly bounded by direct detection. Constraints from current searches are already significantly stronger than LHC bounds, and will improve in the near future. Interestingly, the loop contribution we find is isospin violating even if the underlying theory is isospin conserving.