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- W3126287834 abstract "We revisit the anomalous chromomagnetic dipole moment in the Standard Model and show that its triple gluon vertex contribution, with the on-shell gluon ( $${q^{2}}=0$$ ), generates an infrared divergent pole. Consequently, the chromomagnetic dipole should not be perturbatively evaluated at $${q^{2}}=0$$ . Focusing on this top quark anomaly, denoted as $$hat{mu }_t({q^{2}})$$ , we compute it with the off-shell gluon with a large momentum transfer, just as the $$alpha _s({m_{Z}^{2}})$$ convention scale, for both spacelike $${q^{2}}=-{m_{Z}^{2}}$$ and timelike $${q^{2}}={m_{Z}^{2}}$$ cases. We found that $$hat{mu }_t(-{m_{Z}^{2}})= -0.0224-0.000925i$$ and $$hat{mu }_t({m_{Z}^{2}}) = -0.0133-0.0267i$$ . Our $$mathrm {Re} hat{mu }_t(-{m_{Z}^{2}})$$ matches well with the current experimental value $$hat{mu }_t^{mathrm {Exp}}=-0.024_{-0.009}^{+0.013}(mathrm {stat})_{-0.011}^{+0.016}(mathrm {syst})$$ , and the $$mathrm {Im} hat{mu }_t(-{m_{Z}^{2}})$$ part is induced by flavour changing charged currents." @default.
- W3126287834 created "2021-02-15" @default.
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- W3126287834 date "2021-02-01" @default.
- W3126287834 modified "2023-10-16" @default.
- W3126287834 title "Revisiting the top quark chromomagnetic dipole moment in the SM" @default.
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- W3126287834 doi "https://doi.org/10.1140/epjp/s13360-021-01102-x" @default.
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