Laboratory-frame tests of quantum entanglement in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>H</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>W</mml:mi><mml:mi>W</mml:mi></mml:math>

2023/04/20 by J. A. Aguilar-Saavedra, J. A. Aguilar–Saavedra · 17 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Neutrino Physics Research #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.1103/physrevd.107.076016

Abstract

Quantum entanglement between the two W bosons resulting from the decay of a Higgs boson may be investigated in the dilepton channel H\ensuremath→WW\ensuremath→\ensuremathℓ\ensuremathν\ensuremathℓ\ensuremathν using laboratory-frame observables that only involve the charged leptons \ensuremathℓ=e, \ensuremathμ. The dilepton invariant mass distribution, already measured by the ATLAS and CMS Collaborations at the LHC, can be used to observe the quantum entanglement of the WW pair with a statistical sensitivity of 7\ensuremathσ with run 2 data, and of 6\ensuremathσ when including theoretical systematics. As a by-product, the relation between W rest frame (four-dimensional) angular distributions, H\ensuremath→WW decay amplitudes, and spin correlation coefficients, is written down.

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