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Comment by CGMthrowaway

5 days ago

You're right. Parke & Taylor showed the simplest nonzero amplitudes have two minus helicities while one-minus amplitudes vanish (generically). This paper claims that vanishing theorem has a loophole - a new hidden sector exists and one-minus amplitudes are secretly there, but distributional

> simplest nonzero amplitudes have two minus helicities while one-minus amplitudes vanish

Sorry but I just have to point out how this field of maths read like Star Trek technobabble too me.