How to deal with 5 point scalars?

[MeissnerAndre]

I try to integrate SFAD[{p, -k^2, 2}, {p + l, -[Lambda]^2}, {p + q, 0, 2}] with FeynCalc. If I try to use PackageX, it tells me that it can't solve for Subscript[E, 0](0,l^2,l^2-2 (l[CenterDot]q)+q^2,0,q^2,l^2,q^2,l^2-2 (l[CenterDot]q)+q^2,q^2,q^2,k^2,k^2,[Lambda]^2,0,0). Trying to solve it via FeynmanParametrize crashes my laptop. I cant further simplify this integral with TID and ApartFF. Any suggestions?

[vsht]

You can do an IBP Reduction to get rid of the propagators raised to integer powers.Package-X can probably also do this integral, but you need to invoke it directly, not via FeynCalc. In the X syntax it’s a weighted 3-point PaVe, while FC doesn’t recognize such objects and maps it directly to a 5-point function.Am 20.02.2025 um 19:07 schrieb MeissnerAndre ***@***.***>: I try to integrate SFAD[{p, -k^2, 2}, {p + l, -[Lambda]^2}, {p + q, 0, 2}] with FeynCalc. If I try to use PackageX, it tells me that it can't solve for Subscript[E, 0](0,l^2,l^2-2 (l[CenterDot]q)+q^2,0,q^2,l^2,q^2,l^2-2 (l[CenterDot]q)+q^2,q^2,q^2,k^2,k^2,[Lambda]^2,0,0). Trying to solve it via FeynmanParametrize crashes my laptop. I cant further simplify this integral with TID and ApartFF. Any suggestions? —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>