QCD 4-jet generation in MG 4

Hi Jiaxu,

We didn't make anymore support for MG4.
I'd strongly suggest to use MG5 instead.

We have improve multi-jets in MG5, so this should be much faster and
more efficient than the old MG4.

Cheers,

Olivier

On 26-mars-12, at 13:55, jiaxu wrote:

> New question #191745 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/191745
>
>
> I used MG 4 to generate 50000 QCD 4-jet events.
>
> but there are just 15080 events generated:
>
> Iteration 1 too large truncation 0.0694536886 47915
> Iteration 2 too large truncation 0.060278045 37108
> Iteration 3 too large truncation 0.0489434058 28961
> Iteration 4 too large truncation 0.0346107892 22684
> Iteration 5 too large truncation 0.0162034932 17654
> Iteration 6 too few events 0.000976177049 13798
> Iteration 7 too few events 0.00104908594 14570
> Iteration 8 too few events 0.00243860913 15381
> Iteration 9 too few events 0.00709736311 16035
> Iteration 10 too large truncation 0.0115235672 16833
> Iteration 11 too few events 0.000893652751 13015
> Iteration 12 too few events 0.000967647809 13842
> Iteration 13 too few events 0.00104057802 14489
> Iteration 14 too few events 0.00188745815 15297
> Iteration 15 too few events 0.00657376968 15985
> Iteration 16 too large truncation 0.011025806 16724
> Iteration 17 too few events 0.000885073058 13023
> Iteration 18 too few events 0.000959068116 13751
> Iteration 19 too few events 0.00103201978 14466
> Iteration 20 too few events 0.00133304699 15080
> Unable to get 50000 events. Writing 15080
> Unweighting selected 15080 events.
>
> How can I fixed it and generated 50000 events?
>
>
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