The $τ$ Magnetic Dipole Moment at Future Lepton Colliders
Open Access Publications from the University of California

## The $τ$ Magnetic Dipole Moment at Future Lepton Colliders

• Author(s): Howard, Jessica N
• Rajaraman, Arvind
• Riley, Rebecca
• Tait, Tim MP
• et al.
Abstract

The magnetic moment of the $\tau$ lepton is an interesting quantity that is potentially sensitive to physics beyond the Standard Model. Electroweak gauge invariance implies that a heavy new physics contribution to it takes the form of an operator which involves the Higgs boson, implying that rare Higgs decays are able to probe the same physics as $a_\tau$. We examine the prospects for rare Higgs decays at future high energy lepton (electron or muon) colliders, and find that such a project collecting a few ab$^{-1}$ would be able to advance our understanding of this physics by roughly a factor of 10 compared to the expected reach of the high luminosity LHC.

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