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- W2022894152 abstract "$mathrm{CP}$-violating dipole moments of leptons vanish at least to three loop order and are estimated to be ($({m}_{l}/mathrm{MeV})ifmmodetimeselsetexttimesfi{}1.6ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}40}e$ cm in the standard model (SM), where ${m}_{l}$ is the mass of the lepton. However, they can receive potentially large contributions in some beyond the SM scenarios and this makes them very sensitive probes of new physics. In this article we show that a nonuniversal interaction, involving leptoquarks to the quark-lepton pair of the third generation through helicity-unsuppressed couplings of the order of ordinary gauge couplings, can generate electric and weak dipole moments of the order of ${10}^{ensuremath{-}19}e$ cm for the $ensuremath{tau}$ lepton. This is greater than pure supersymmetric (SUSY) and left-right ($mathrm{LR}$) contributions by almost three orders of magnitude. It is also greater than the mirror fermionic contribution by an order of magnitude. The measurements of ${d}_{ensuremath{tau}}^{z}$ and ${d}_{ensuremath{tau}}^{ensuremath{gamma}}$ at CERN LEP, SLC, and TCF are expected to reach sensitivities of ${10}^{ensuremath{-}18}e$ cm and ${10}^{ensuremath{-}19}e$ cm, respectively, in the near future. The observation of a nonvanishing dipole moment of $ensuremath{tau}$ at these facilities would, therefore, strongly favor superstring-inspired light leptoquark-mediated interactions, over pure SUSY or $mathrm{LR}$ interactions and perhaps also mirror-generated mixings without some sort of quark-lepton unification as its origin." @default.
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- W2022894152 title "Dipole moments of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>τ</mml:mi></mml:math>lepton as a sensitive probe for physics beyond the standard model" @default.
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- W2022894152 doi "https://doi.org/10.1103/physrevd.54.3377" @default.
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