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The Z boson spin observables as messengers of new physics
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abstract
We demonstrate that the 8 multipole parameters describing the spin state of the $Z$ boson are able to disentangle known $Z$ production mechanisms and signals from new physics at the LHC. They can be extracted from appropriate asymmetries in the angular distribution of lepton pairs from the $Z$ boson decay. The power of this analysis is illustrated by (i) the production of $Z$ boson plus jets; (ii) $Z$ boson plus missing transverse energy; (iii) $W$ and $Z$ bosons originating from the two-body decay of a heavy resonance.
Forward citations
Cited by 2 Pith papers
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$H \to ZZ$ as a double-slit experiment
Comparing angular correlations between the eeμμ and 4e/4μ channels of H→ZZ→4ℓ offers a new quantum-interference test and a first identical-particle probe for muons at the HL-LHC.
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Quantum tomography beyond the leading order
NLO corrections to angular distributions can be subtracted as a background, allowing quantum tomography of H to ZZ to four leptons to be performed with the well-defined leading-order spin interpretation.
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