arXiv 2004.061252020-04hep-phhep-ex

对撞机事件各向同性的鲁棒测度

A Robust Measure of Event Isotropy at Colliders

Cari Cesarotti, Jesse Thaler

备注：: 49 pages, 31 figures, 2 tables. v3: Minor discussion added to match JHEP version

摘要：

我们引入了一个新的事件形状观察-事件各向同性-量化如何接近碰撞事件的辐射模式是一个均匀的分布。这个观测值是基于能量移动器距离的归一化版本，这是将一个辐射图案重新排列成另一个相等能量的辐射图案所需的最小“功”。我们调查的效用事件各向同性的正负电子对撞机，事件相比，一个完美的球形辐射图案，以及在质子质子对撞机，自然的比较是圆柱形或环状图案。与传统的事件形状观测量（如球度和推力）相比，事件各向同性对高多重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射流和多射流过程，而且可以区分不同N值的均匀N体相空间构型。作为这个新的可观测的一个关键应用，我们研究了它的性能，以表征强耦合的新的物理场景与各向同性对撞机签名。

英文摘要：

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.

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