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arXiv · 2509.01452

Bounds on SMEFT affecting multi gauge and Higgs-gauge couplings using two and three body spin correlations in $e^-e^+\to 3l2j\slashed{E}$ process

Amir Subba·Ritesh K. Singh
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Abstract

The upcoming electron-positron collider provides an ideal place to probe deviation from the Standard Model predictions with its clean environment, beam polarization and significant luminosity. We studied anomalous quartic gauge boson couplings~($VVW^-W^+, V\in\{\gamma,Z\}$), triple gauge couplings~($W^-W^+\gamma/Z)$, and Higgs-gauge couplings $(HVV, V\in\{W^\pm,Z,\gamma\}$) induced by $SU(2)_L \times U(1)_Y$ gauge invariant dimension-6 operators in $3l2j\slashed{E}$ final events with initial beam polarization. The phase space of two prominent amplitudes i.e, triple gauge boson production $(WWV)$ and vector boson scattering sub-processes, are selected with boosted decision trees. We employ the asymmetries related to polarization and spin correlation observables along with cross~section to constrain the anomalous couplings. The parity odd polarizations and spin correlations of jets from $W$ boson require flavor tagging which is done using artificial neural networks. We provide one parameter limits at $95\%$ confidence level combining cross~section and spin related observables. Finally, marginalized limits on all nine anomalous couplings are obtained with MCMC analysis. The limits are found to be insensitive to systematic errors and dominated by statistics. We find that the VBS-like events provides a tighter constraints to $c_W$ and $c_B$ Wilson coefficients (WCs) in comparison to limits from WWZ phase space. For the remaining $7$ WCs, WWZ contribute significantly to the overall limits.

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Amir Subba, Ritesh K. Singh. 2025-09-01. Bounds on SMEFT affecting multi gauge and Higgs-gauge couplings using two and three body spin correlations in $e^-e^+\to 3l2j\slashed{E}$ process. https://doi.org/10.1103/ntgz-czmt

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