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arXiv · 2610.24319

Collider event distances from the phase space sphere

Nathaniel Craig·Brian Henning·Andrew J. Larkoski·Iñigo Valenzuela Lombera
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Abstract

Can the distribution of collider events in phase space be used to distinguish the processes that produced them? We present a distance-based classification method that uses the global topology of Lorentz-invariant phase space and retains reconstructed masses. To tackle particularly challenging classification tasks that may benefit from higher event resolution, we develop a polynomial-time approximation to compute the distances. The resulting classifiers achieve strong discrimination across several simulated benchmarks, including fully hadronic four-top production against $t\bar t+\text{jets}$.

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Nathaniel Craig, Brian Henning, Andrew J. Larkoski, Iñigo Valenzuela Lombera. 2026-10-16. Collider event distances from the phase space sphere. https://arxiv.org/abs/2610.24319

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