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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2512.06671 |
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| _version_ | 1866908697102385152 |
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| author | Subba, Amir Singh, Ritesh K. |
| author_facet | Subba, Amir Singh, Ritesh K. |
| contents | We investigate anomalous charged triple gauge boson couplings induced by $SU(2)_L \times U(1)_Y$ gauge-invariant dimension-6 operators in the HISZ basis through the processes $e^-e^+ \to 4j$ and $e^-e^+ \to \ell^-\ell^+ + \text{missing energy}$ at $\sqrt{s}=250\,$GeV with longitudinally polarized beams. The analysis includes three CP-even operators $(O_{WWW}, O_W, O_B)$ and two CP-odd operators $(\tilde O_{WWW}, \tilde O_W)$, which parameterize deviations in the $W^-W^+γ/Z$ vertex. All leading-order contributions are included, including interference between $W^-W^+$ production and non-resonant amplitudes. In the $e^-e^+ \to 4j$ channel, $W^-W^+$ candidates are selected using boosted decision trees. The $W$-boson charges are reconstructed using a jet-charge observable, and jet flavors from $W$ decays are identified with a dedicated classifier, enabling measurements of vector polarization and correlation asymmetries. In the $e^-e^+ \to \ell^-\ell^+ + \text{missing energy}$ channel, events are selected with cuts on lepton transverse momentum and dilepton mass, and the two neutrino momenta are reconstructed using neural-network regression. Combining total cross sections with spin asymmetries allows constraints on anomalous gauge couplings. The fully hadronic channel provides the strongest sensitivity to $O_B$ and $\tilde O_W$, while the semi-leptonic channel yields tighter limits on $O_{WWW}$, $O_W$, and $\tilde O_{WWW}$. The fully leptonic channel adds complementary sensitivity. Finally, we derive marginalized limits on all five operators using a Markov Chain Monte Carlo analysis for several choices of systematic uncertainties and integrated luminosities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_06671 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing anomalous $W^-W^+γ/Z$ couplings in the SMEFT with $e^-e^+ \to W^-W^+ \to 4j/\ell^-\ell^+\slashed{E}$ channel Subba, Amir Singh, Ritesh K. High Energy Physics - Phenomenology We investigate anomalous charged triple gauge boson couplings induced by $SU(2)_L \times U(1)_Y$ gauge-invariant dimension-6 operators in the HISZ basis through the processes $e^-e^+ \to 4j$ and $e^-e^+ \to \ell^-\ell^+ + \text{missing energy}$ at $\sqrt{s}=250\,$GeV with longitudinally polarized beams. The analysis includes three CP-even operators $(O_{WWW}, O_W, O_B)$ and two CP-odd operators $(\tilde O_{WWW}, \tilde O_W)$, which parameterize deviations in the $W^-W^+γ/Z$ vertex. All leading-order contributions are included, including interference between $W^-W^+$ production and non-resonant amplitudes. In the $e^-e^+ \to 4j$ channel, $W^-W^+$ candidates are selected using boosted decision trees. The $W$-boson charges are reconstructed using a jet-charge observable, and jet flavors from $W$ decays are identified with a dedicated classifier, enabling measurements of vector polarization and correlation asymmetries. In the $e^-e^+ \to \ell^-\ell^+ + \text{missing energy}$ channel, events are selected with cuts on lepton transverse momentum and dilepton mass, and the two neutrino momenta are reconstructed using neural-network regression. Combining total cross sections with spin asymmetries allows constraints on anomalous gauge couplings. The fully hadronic channel provides the strongest sensitivity to $O_B$ and $\tilde O_W$, while the semi-leptonic channel yields tighter limits on $O_{WWW}$, $O_W$, and $\tilde O_{WWW}$. The fully leptonic channel adds complementary sensitivity. Finally, we derive marginalized limits on all five operators using a Markov Chain Monte Carlo analysis for several choices of systematic uncertainties and integrated luminosities. |
| title | Probing anomalous $W^-W^+γ/Z$ couplings in the SMEFT with $e^-e^+ \to W^-W^+ \to 4j/\ell^-\ell^+\slashed{E}$ channel |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.06671 |