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Quantum Foundations

Probing entanglement and testing Bell inequality violation with textrm{e}⁺textrm{e}^- → τ⁺τ^- at Belle II

arXiv

Authors: Karl Ehatäht, Marco Fabbrichesi, Luca Marzola, Christian Veelken

Year

2023

Paper ID

6473

Status

Preprint

Abstract Read

~2 min

Abstract Words

134

Citations

N/A

Abstract

We present a feasibility study to probe quantum entanglement and Belle inequality violation in the process textrm{e}⁺textrm{e}^- → τ⁺τ^- at a center-of-mass energy of sqrt{s} = 10.579 GeV. The sensitivity of the analysis is enhanced by applying a selection on the scattering angle vartheta in the τ⁺τ^- center-of-mass frame. We analyze events in which both τ leptons decay to hadrons, using a combination of decay channels τ^- → π^-ν_τ, τ^- → π^-π⁰ν_τ, and τ^- → π^-π⁺π^-ν_τ. The spin orientation of the τ leptons in these decays is reconstructed using the polarimeter-vector method. Assuming a dataset of 200 million τ⁺τ^- events and accounting for experimental resolutions, we expect the observation of quantum entanglement and Bell inequality violation by the Belle-II experiment will be possible with a significance well in excess of five standard deviations.

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We present a feasibility study to probe quantum entanglement and Belle inequality violation in the process textrme^+textrme^- -> τ^+τ^- at a center-of-mass energy of sqrts =...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2311.17555 [2] arXiv https://arxiv.org/abs/2311.17555 [3] Publisher https://arxiv.org/abs/2311.17555

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