MadGraph5_aMC@NLO

Channel 1 has encountered a fraction of 0.374 of numerically unstable loop matrix element computations

Asked by ouseph cj

Dear MadGraph Experts,

I am working on the following process in MadGraph: p p > h zp [QCD], and I am initiating the decays h > b b~ and zp > nu nu using the MadSpin card, where zp is a top-philic Z-prime boson. However, the simulation ends with an error message stating:

Command "generate_events run_01" interrupted with error:
Exception: Channel 1 has encountered a fraction of 0.374 of numerically unstable loop matrix element computations (which could not be rescued using quadruple precision). The results cannot be trusted.
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in '/root/MG5_aMC_v2_7_3/11/run_01_tag_1_debug.log'. Please attach this file to your report.

Could you please advise on how to resolve this error? Do I need to adjust any parameters in the MadLoop card to improve numerical stability?

Thank you very much for your help.

Best regards,
Ouseph

Question information

Language:
English Edit question
Status:
Open
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Valentin Hirschi Edit question
Last query:
Last reply:
Revision history for this message
ouseph cj (ouseph444) said : 		#1

Dear MadGraph Experts,
 I was wondering if there were any updates on my previous question. I would greatly appreciate any information you can provide.

Thank you for your time and assistance.

Best regards,

Ouseph

Can you help with this problem?

Provide an answer of your own, or ask ouseph cj for more information if necessary.

To post a message you must log in.