New physics interpretations for nonstandard values of $h\to Z\gamma$

Abstract

Current measurement of the $h\to Z\gamma$ signal strength invite us to speculate about possible new physics interactions that exclusively affect ${\mu }_{Z\gamma }$ without altering the other signal strengths. Additional consideration of tree-unitarity enables us to correlate the nonstandard values of ${\mu }_{Z\gamma }$ with an upper limit on the scale of new physics. We find that even when ${\mu }_{Z\gamma }$ deviates from the SM value by only $20\%$, the scale of new physics should be well within the reach of the LHC.

Comments: Updated Fig.3. Appendix A added, discussions added. Version accepted for publication in Phys. Rev. D