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arXiv · 2409.16731

From angular coefficients to quantum observables: a phenomenological appraisal in di-boson systems

Michele Grossi·Giovanni Pelliccioli·Alessandro Vicini
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Abstract

Motivated by the growing interest in accessing the spin structure of multi-boson processes and in measuring quantum entanglement at high energies, we study polarisation and spin-correlation coefficients in di-boson systems. We show that higher-order corrections of QCD and electroweak type, off-shell modelling, and realistic effects such as fiducial selections and neutrino reconstruction are unavoidable to properly determine such coefficients, and consequently to provide a sound interpretation of observables sensitive to quantum entanglement and Bell-inequality violation. Our findings are based on a detailed phenomenological analysis of boson pairs at the LHC, either in inclusive electroweak production or coming from Higgs-boson decays.

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Michele Grossi, Giovanni Pelliccioli, Alessandro Vicini. 2024-09-25. From angular coefficients to quantum observables: a phenomenological appraisal in di-boson systems. https://doi.org/10.1007/jhep12(2024)120

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