复兴干涉：SMEFT中反常胶子自相互作用的框架与原理性证明
Reviving the interference: framework and proof-of-principle for the anomalous gluon self-interaction in the SMEFT
AI总结：
针对SMEFT中反常胶子自相互作用因干涉正负贡献抵消导致效应难测的问题，提出量化可观测量分离相反贡献能力的方法，应用后首次仅通过干涉得到与新物理振幅平方相当的系数约束。
摘要：
干涉并非正定，且会在相空间中改变符号。若其正负区域的贡献近乎相互抵消，其效应将难以测量。本文提出一种方法，量化可观测量分离这些相反贡献的能力，从而在实验中复兴干涉效应。我们将该策略应用于SMEFT中的反常胶子算符（其线性项抑制是已知的），首次仅通过干涉对其系数得到与新物理振幅平方相当的约束。
英文摘要：
Interferences are not positive-definite and can change sign over the phase space. If the contributions of the regions where they are positive and negative nearly cancel each other, their effects can be hard to measure. In this paper, we propose a method to quantify the ability of an observable to separate these opposite contributions and therefore to revive the interference effects at experiments. We apply this strategy to the anomalous gluon operator in the SMEFT, for which the linear-term suppression is well known. We show that we can get, for the first time, constraints on its coefficient from the interference only that are similar to those from the square of the new-physics amplitude.
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