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arXiv · 2610.38688

Precision Studies of Boosted Polarized Vector Bosons with Energy Correlators

Anjie Gao·Kyle Lee·Xiaoyuan Zhang
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Abstract

Boosted, hadronically decaying $W$ and $Z$ bosons are among the most abundant heavy objects at colliders, and their vector nature makes their substructure qualitatively richer than that of a scalar. We initiate precision studies of the hadronic decays of boosted polarized vector bosons with energy correlators. In the narrow-width limit, the laboratory-frame two-point energy correlator is a sum of longitudinal and transverse decay spectra, each weighted by its polarized production rate and obtained by a closed-form boost kernel acting on rest-frame correlators. Combining polarized production density matrices, computed at NNLO in QCD for $pp\to V+X$ and at leading order for $e^+e^-\to W^+W^-$, with decay correlators that combine NNLO fixed order with NNLL collinear and N$^4$LL back-to-back resummation, we find for high-$p_T$ $W/Z$ production that polarization shifts the spectrum by $\mathcal{O}(10\%)$ relative to a naive unpolarized treatment. Even without any reconstruction, hadronic $W/Z$ decays stand out over the realistic QCD background of untagged jet samples as a localized angular bump. Our results open the door to using energy correlators for polarimetry of electroweak bosons through their hadronic decays, for standard-candle measurements of electroweak bosons inside jets, and in sharper searches for new resonances.

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Anjie Gao, Kyle Lee, Xiaoyuan Zhang. 2026-10-28. Precision Studies of Boosted Polarized Vector Bosons with Energy Correlators. https://arxiv.org/abs/2610.38688

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