$H\to ZZ$ as a double-slit experiment

The decay $H\to ZZ\to 4\mathrm{\ell }$, with $\mathrm{\ell }=e,\mu$, can be used to test quantum interference in analogy to the famous double-slit experiment. The observations corresponding to covering a slit' can be extracted from data in the $eeμμ$ channel, while the observations when both slits’ are open, which include the interference, are measured in the $4e\mathrm{/}4\mu$ channels. In this way, this process offers a unique opportunity to investigate identical-particle effects at high energies, and provide the first evidence of identical-particle behaviour for muons. Sensitivity at the $4\sigma$ level could be achieved at the high-luminosity upgrade of the Large Hadron Collider.