A technical question about the amplituhedron

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nrqed
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Main Question or Discussion Point

One of the ways to introduce the amplituhedron is through the equation ##Y = C Z^T ## where ## Z \in M^+(k+m,n)##, ##C \in Gr_{\leq 0} (k,n)##, ##Y \in Gr(k,k+m)##.

I am trying to understand what the parameter ##k## represents. For a while, I thought that this ##k## was counting the number of particles with negative helicities but that it seems to be incorrect. Can someone help? Thanks.
 

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nrqed
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Thank you. Yes, Gr is for Grassmannian. I know the math,my questions is about how the value ##k## is related to the number of negative helicity particles in the amplitude.
Thanks for your feedback.
 
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