Higgs Boson Spookiness: Probing Quantum Nonlocality with Spacetime-Resolved $H\rightarrow\tau^+\tau^-$ Decays

TL;DR

This paper proposes that future Higgs factories could perform spacetime-resolved tests of quantum nonlocality in Higgs decays, potentially excluding superluminal entanglement signaling.

Contribution

It introduces a novel method to measure spacetime-dependent spin correlations in Higgs decays, enabling direct tests of quantum nonlocality at colliders.

Findings

Can exclude superluminal entanglement signaling speeds below ~2c at 95% CL.

First spacetime-resolved measurement of electroweak quantum entanglement at a collider.

Demonstrates future Higgs factories' capability to test fundamental quantum physics.

Abstract

We demonstrate that a future precision $ee$ Higgs factory would be able to perform a spacetime-resolved test of quantum nonlocality in Higgs boson decays. In simulated $ee\rightarrow ZH \rightarrow (\mu\mu)(\tau\tau)$ events at $\sqrt{s}=240$ GeV, we reconstruct $\tau$ lepton decay vertices and measure spin correlations as a function of the spacetime interval between the two $\tau$ decays. Such a measurement would be able to test Bell-inequality-violating correlations for spacelike-separated decays, enabling direct exclusion of superluminal, finite-speed entanglement signaling theories. With 0.75 ab$^{-1}$ of integrated luminosity, entanglement signal propagation speeds below $\approx2c$ can be excluded at 95$\%$ CL. Signals establishing any spin correlation can be excluded for speeds below $\approx9c$. This constitutes the first proposed spacetime-resolved measurement of electroweak quantum entanglement at a particle collider and demonstrates a unique capability of future Higgs factories.