High-Energy Decays and Weak Quantum Measurements
Abstract
High-energy particle decays naturally realise informationally weak measurements of quantum spin. Decay kinematics act as continuous pointer variables whose overlapping angular distributions encode partial, non-projective information about the parent spin state. Ensemble averages of these pointers yield weak values, linking collider spin-density reconstruction to Aharonov-Vaidman measurement theory. This framework unifies spin tomography, entangled-decay correlations, and spin-correlation algorithms, showing that relativistic decays realise informationally weak measurements of spin and suggesting new ways to probe coherence and interference in high-energy processes.
Cite
@article{arxiv.2511.10197,
title = {High-Energy Decays and Weak Quantum Measurements},
author = {Alan J. Barr},
journal= {arXiv preprint arXiv:2511.10197},
year = {2026}
}
Comments
5 pages. v2 provides a better quantitative description of the informational weakness of the decay and relates it to spin analysing power