Neutralino width set to 0 for consistency
Hi,
I am trying to generate the RPV SUSY process: p p > go go using the MSSM_SLHA2 model in MadGraph 2.6.7 + Pythia 8. The gluinos decay to a neutralino + SM quarks, and the neutralino decays via an RPV coupling to SM quarks. When I set the width of the neutralino so that it has a non-zero lifetime (like 0.01 ns, for example), then the event generation works as expected and the neutralino has the desired lifetime. However if I increase the width of the neutralino to 1.0 so that it decays promptly, MadGraph gives me the following warning,
WARNING: For consistency, the width of particle 1000022 (n1) is changed to 0.0.
, and the neutralino becomes stable. It seems that setting the neutralino width above ~ 1E-5 causes MadGraph to change the width to 0, while any width below this it leaves unchanged.
I would like to know why this is happening? And how I can produce events with promptly-decaying neutralinos?
Thank you,
Emily Thompson
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