arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1402.1173hep-phastro-ph.CO
收藏

标准模型环对暗物质有效理论的新限制

New Constraints on Dark Matter Effective Theories from Standard Model Loops

Andreas Crivellin, Francesco D'Eramo, Massimiliano Procura

摘要:

考虑了单重Dirac暗物质(DM)粒子与标准模型(SM)场通过有效算符相互作用的有效场论,有效算符的尺度为$Λ\gtrsim 1$ TeV.我们进行了一个系统的分析的领先的循环贡献自旋无关(SI)DM-核子散射之间的重整化群演化$Λ$和直接探测实验探测的低能量标度。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SI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。目前搜索的限制与LHC的限制相当,并且在不久的将来会有显着改善。有趣的是,我们发现的环路贡献是最大的同位旋破坏,即使基础理论是同位旋守恒。

英文摘要:

We consider an effective field theory for a gauge singlet Dirac dark matter (DM) particle interacting with the Standard Model (SM) fields via effective operators suppressed by the scale $Λ\gtrsim 1$ TeV. We perform a systematic analysis of the leading loop contributions to spin-independent (SI) DM--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 SI 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 comparable to LHC bounds, and will significantly improve in the near future. Interestingly, the loop contribution we find is maximally isospin violating even if the underlying theory is isospin conserving.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑