A robust measure of event isotropy at colliders
A robust measure of event isotropy at colliders
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DOI：
10.1007/jhep08(2020)084
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发表时间：
2020-04
影响因子：
5.4
通讯作者：
C. Cesarotti;J. Thaler
中科院分区：
文献类型：
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作者：
C. Cesarotti;J. Thaler
我们引入了一种新的事件形状可观测的事件各向同性，它量化了对撞机事件的辐射模式离均匀分布有多近。这一可观测性是基于能量传送器距离的归一化版本，该距离是将一种辐射模式重新排列成另一种相同能量的模式所需的最小“功”。我们研究了事件各向同性在电子-正电子对撞机和质子-质子对撞机上的实用性，在电子-正电子对撞机中，事件被比较成完美的球面辐射图案，在质子-质子对撞机中，自然比较的是圆柱形或环状图案。与传统的球度和推力等事件形状观测值相比，事件各向同性对于高重数事件表现出更大的动态范围。这使得事件各向同性不仅可以区分双喷流和多喷流过程，而且可以区分不同N值的均匀N体相空间组态。作为这一新的能观的一个关键应用，我们研究了它在描述具有各向同性对撞机特征的强耦合新物理场景方面的性能。
We introduce a new event shape observable—event isotropy—that quantifies how close the radiation pattern of a collider event is to a uniform distribution. This observable is based on a normalized version of the energy mover’s distance, which is the minimum “work” needed to rearrange one radiation pattern into another of equal energy. We investigate the utility of event isotropy both at electron-positron colliders, where events are compared to a perfectly spherical radiation pattern, as well as at proton-proton colliders, where the natural comparison is to either cylindrical or ring-like patterns. Compared to traditional event shape observables like sphericity and thrust, event isotropy exhibits a larger dynamic range for high-multiplicity events. This enables event isotropy to not only distinguish between dijet and multijet processes but also separate uniform N-body phase space configurations for different values of N. As a key application of this new observable, we study its performance to characterize strongly-coupled new physics scenarios with isotropic collider signatures.