ab>c,c>de Does c have to be on-shell?
Asked by
Fang Xu
Hi, I am a new user and considering some process like a b > c d, d >e f, where I should scan the mass M_d. And this will let d to be on-shell or off-shell.
But I find that when Ecm < M_d+M_c, if I use a b > c d, d > e f. I can still get some positive cross section which is weird I think.
(1) Does this mean that when I am writing x y > z, z>..... z is not forced on-shell?
(2) What is the difference if I use a b > d > c e f. instead of a b > c d, d > e f? I checked the cross section but they give me different value. At first I think thats just because "a b > c d, d > e f" means d is always on-shell and "a b > d > c e f" means d is always off-shell. But it seems this understanding is not right...
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- Solved by:
- Olivier Mattelaer
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