Using ultraperipheral lead-lead collisions, a lepton-plus-tracks analysis could constrain the tau anomalous magnetic moment to -0.0080 < a_tau < 0.0046 at 68% CL, three times better than DELPHI.
A note on Majorana neutrinos, leptonic CKM and electron electric dipole moment
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abstract
The electric dipole moment of the electron, $d_e$, is known to vanish up to thre e-loops in the standard model with massless neutrinos. However, if neutrinos are massive Majorana particles, we obtain the result that $d_e$ induced by leptonic CKM mechanism is non-vanishing at two-loop order, and it applies to all massive Majorana neutrino models.
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New physics and tau $g-2$ using LHC heavy ion collisions
Using ultraperipheral lead-lead collisions, a lepton-plus-tracks analysis could constrain the tau anomalous magnetic moment to -0.0080 < a_tau < 0.0046 at 68% CL, three times better than DELPHI.