Z+jets [OpenLoops] register_process: process 1 -2 -> 13 -13 3 -4 not found!

[holsch]

The integration of Z+jets with LJET:=2,3,4 fails

I use the attached runcard. (2,3 is fine).

There is some fixing going by Stefan and Marek having to do with the new syntax for Order.

I use a clean directory and create the lib source code using Dummy as Loopgen as suggested by Stefan (temporary work around) however, to no avail. The following message is what I got:

[OpenLoops] register_process: process 1 -2 -> 13 -13 3 -4 not found!

[marek]

Replace "Order(*,2);" by "Order (*,2);". The former is not recognised and thus all orders are computed, leading to asking OpenLoops for a subleading process which it does not provide. I will try to put a safe-guard in for missing spaces in this section. However, this sets the requested orders correctly, but Amegic still thinks it can generate a process 1 -2 -> 13 -13 3 -4 in the orders range (0,2) .. (99,2). Need to investigate further.

[marek]

Could you please test the appended patch. It generates the processes fine, but I will have to cross check that it does not break things elsewhere.

[anonymous]

Okay, seems to have no ill side-effects so far. Committed as r25872.