A massless complex scalar pair with purely left-handed vector coupling exactly reproduces the Michel distribution and its extensions, while all other invisible pairs of spin up to 2 produce distinguishable kinematic signatures.
Michel, Proc
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Can a Nonstandard Invisible Pair Mimic the Michel Distribution?
A massless complex scalar pair with purely left-handed vector coupling exactly reproduces the Michel distribution and its extensions, while all other invisible pairs of spin up to 2 produce distinguishable kinematic signatures.