Name: Paulina Knees Date: 07/16/20-10:45:12 PM Z
Dear author,
I’m calculating the decay width of a massive neutrino decaying to three
SM neutrinos through a Z boson. But when I want to calculate the squared
amplitude (including fermion spin sum), I get the following error
message:
“Error! DiracTrace has encountered a fatal problem and must abort the
computation. The problem reads: Trace still
contains chiral projectors.
I realised that the product of the amplitude and its conjugate contains terms with “gamma^$AL($188)” and “gamma^$AL($189)”, and I don’t really know what it is. Besides, the amplitude I get with FeynArts seems to be right.
Thank you very much for your time,
Bests,
Paulina ([pknees_at_HIDDEN-E-MAIL])