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arXiv 2106.05337hep-ph
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在$\mathcal O(1/Λ^4)$的SMEFT中的双轻子生产

Dilepton production in the SMEFT at $\mathcal O(1/Λ^4)$

Radja Boughezal, Emanuele Mereghetti, Frank Petriello

摘要:

我们研究了标准模型有效场论中包含的$\mathcal O(1/Λ^4)$效应与LHC当前Drell-Yan数据的拟合。我们的分析包括一套完整的6维和8维运营商的双轻子过程中作出贡献,并进行到下一个领导阶的QCD耦合常数在$\mathcal O(1/Λ^2)$和$\mathcal O(1/Λ^4)$。我们发现,包括维度6平方项和某些维度8运营商有显着的影响,适合当前的数据。忽略它们会导致6维算子的界偏离很大的因子。我们发现,8维四费米子运营商已经可以探测到几个TeV的水平LHC的结果,他们的列入显着改变了6维运营商的限制。我们讨论了哪些维度8运营商应包括在适合大型强子对撞机的数据。只有一个可管理的子集的二阶导数8维四费米子运营商需要在这个阶段包括目前的大型强子对撞机的不确定性。

英文摘要:

We study the inclusion of $\mathcal O(1/Λ^4)$ effects in the Standard Model Effective Field Theory in fits to the current Drell-Yan data at the LHC. Our analysis includes the full set of dimension-6 and dimension-8 operators contributing to the dilepton process, and is performed to next-to-leading-order in the QCD coupling constant at both $\mathcal O(1/Λ^2)$ and $\mathcal O(1/Λ^4)$. We find that the inclusion of dimension-6 squared terms and certain dimension-8 operators has significant effects on fits to the current data. Neglecting them leads to bounds on dimension-6 operators off by large factors. We find that dimension-8 four-fermion operators can already be probed to the several-TeV level by LHC results, and that their inclusion significantly changes the limits found for dimension-6 operators. We discuss which dimension-8 operators should be included in fits to the LHC data. Only a manageable subset of two-derivative dimension-8 four-fermion operators need to be included at this stage given current LHC uncertainties.

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