限制四顶生产的$qqtt$操作员：增强EFT灵敏度的案例
Constraining $qqtt$ operators from four-top production: a case for enhanced EFT sensitivity
摘要：
最近，实验合作报告了$\mathcal{O}(10)$在大型强子对撞机上四顶产生的信号强度上限。令人惊讶的是，我们发现，约束力的四顶生产的$qqtt$类型的运营商已经具有竞争力的测量顶对生产，即使后者的精度水平是两个数量级以上。这是由四顶截面对$qqtt$算子的灵敏度增强来解释的，这是由于算子在平方振幅中的多次插入，以及四顶产生的大阈值能量。我们指出，即使超过标准模型的主要贡献来自于$\mathcal{O}(C^4/Λ^8)$条款，有效场论的扩展仍然适用于广泛的基础理论。考虑到这一测量的可能改进与更高的积分亮度，我们相信，这一过程将变得更加重要的探测和测试的标准模型偏差的顶夸克部门，并最终将提供有价值的信息，顶夸克的属性，导致显着提高精度顶物理。
英文摘要：
Recently, experimental collaborations have reported $\mathcal{O}(10)$ upper limits on the signal strength of four-top production at the LHC. Surprisingly, we find that the constraining power of four-top production on the $qqtt$ type of operators is already competitive with the measurements of top-pair production, even though the precision level of the latter is more than two orders of magnitude better. This is explained by the enhanced sensitivity of the four-top cross section to $qqtt$ operators, due to multiple insertion of operators in the squared amplitude, and to the large threshold energy of four-top production. We point out that even though the dominant contribution beyond the standard model comes from the $\mathcal{O}(C^4/Λ^8)$ terms, the effective field theory expansion remains valid for a wide range of underlying theories. Considering the possible improvements of this measurement with higher integrated luminosity, we believe that this process will become even more crucial for probing and testing the standard model deviations in the top-quark sector, and will eventually provide valuable information about the top-quark properties, leading to significant improvements in precision top physics.
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