Systematics computation: central scheme variation

Hi,

> Dose it mean the central scheme variation isn't applied in the new version ?

Yes it was not computed in your 2.6.7.

However 2.6.7 can compute those and this is still ON by default.
I would bet that your framework (athena?) decide to change the default to have that functionality turn OFF.
You should check if you can turn it back on via the run_card or if they applied an harder patch to prevent it.

Cheers,

Olivier

> On 2 Apr 2020, at 10:47, Yue Xu <email address hidden> wrote:
>
> New question #689650 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/689650
>
> Dear experts,
>
> I'm a bit puzzled when using the MadGraph version 2.6.7.
> When I use the version 2.6.0 or the older one, I can get the systematic computation output like this:
> 16:59:16 INFO: Running Systematics computation
> 16:59:17 INFO: Idle: 3, Running: 5, Completed: 0 [ current time: 16h59 ]
> 16:59:43 INFO: Idle: 0, Running: 6, Completed: 2 [ 26s ]
> 16:59:46 INFO: # events generated with PDF: NNPDF23_lo_as_0130_qed (247000)
> 16:59:46 INFO: #Will Compute 145 weights per event.
> 16:59:46 INFO: #***************************************************************************
> 16:59:46 #
> 16:59:46 # original cross-section: 0.0057395256
> 16:59:46 # scale variation: +6.43% -5.84%
> 16:59:46 # central scheme variation: +7.8% -5.23e-11%
> 16:59:46 # PDF variation: +5.06% -5.06%
> 16:59:46 #
> 16:59:46 # dynamical scheme # 1 : 0.00581933 +6.48% -5.88% # \sum ET
> 16:59:46 # dynamical scheme # 2 : 0.00581083 +6.48% -5.88% # \sum\sqrt{m^2+pt^2}
> 16:59:46 # dynamical scheme # 3 : 0.00618746 +6.72% -6.09% # 0.5 \sum\sqrt{m^2+pt^2}
> 16:59:46 # dynamical scheme # 4 : 0.00573953 +6.43% -5.84% # \sqrt{\hat s}
> 16:59:46 #***************************************************************************
>
> But when I use the version 2.6.7, there is no systematic computation of the central scheme variation. The output is this:
>
> 05:34:08 INFO: Running Systematics computation
> 05:34:11 INFO: # events generated with PDF: NNPDF23_lo_as_0130_qed (247000)
> 05:34:11 INFO: #Will Compute 109 weights per event.
> 05:34:11 INFO: # currently at event 0 [elapsed time: 0.028 s]
> 05:34:18 INFO: # currently at event 2500 [elapsed time: 6.8 s]
> 05:34:25 INFO: # currently at event 5000 [elapsed time: 14 s]
> 05:34:31 INFO: # currently at event 7500 [elapsed time: 20 s]
> 05:34:38 INFO: # currently at event 10000 [elapsed time: 27 s]
> 05:34:45 INFO: # currently at event 12500 [elapsed time: 34 s]
> 05:34:52 INFO: # currently at event 15000 [elapsed time: 41 s]
> 05:34:59 INFO: # currently at event 17500 [elapsed time: 48 s]
> 05:35:05 INFO: # currently at event 20000 [elapsed time: 55 s]
> 05:35:12 INFO: # currently at event 22500 [elapsed time: 61 s]
> 05:35:19 INFO: # currently at event 25000 [elapsed time: 68 s]
> 05:35:26 INFO: # currently at event 27500 [elapsed time: 75 s]
> 05:35:33 INFO: # currently at event 30000 [elapsed time: 82 s]
> 05:35:40 INFO: # currently at event 32500 [elapsed time: 89 s]
> 05:35:47 INFO: #***************************************************************************
> 05:35:47 #
> 05:35:47 # original cross-section: 0.0057411655
> 05:35:47 # scale variation: +6.42% -5.82%
> 05:35:47 # PDF variation: +5.05% -5.05%
> 05:35:47 #
> 05:35:47 #***************************************************************************
>
>
> I keep the setting "-1 = dynamical_scale_choice" in the above two generations with the same process and same parameters.
>
> Dose it mean the central scheme variation isn't applied in the new version ?
>
> Best,
> Yue
>
> --
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> contact for MadGraph5_aMC@NLO.

HI Olivier,

Yes. I'm using the Athena.
I'm asking the corresponding group if we don't need it anymore.

Thanks for the quick reply!

Cheers,
Yue