[buttered_toast]

Oh that's really cool, I am not versed in physics by any means, can you explain how you believed there to be a simple formula but were unable to find it? What would lead you to believe that instead of just accepting it at face value?

[lupsasca]

There are closely related "MHV amplitudes" which naively obey a really complicated formula, but for which there famously also exists a much simpler "Parke-Taylor formula". Alfredo had derived a complicated expression for these new "single-minus amplitudes" and we were hoping we could find an analogue of the simpler "Parke-Taylor formula" for them.

[buttered_toast]

Thank you for taking the time to reply, I see you might have already answered this elsewhere so it's much appreciated.

[lupsasca]

My pleasure---thank you for your interest!