Turn off PDF systematic weights in LO mode

Hi Josh

You dont need to add the line

 F = sys_pdf

SysCalc will complains, as cannot find "F" as PDF set. To NOT run SysCalc for PDFs you simply have to remove this line

Regards

Alexis

Discussing with Olivier, currently if the "sys_pdf" is missing, MG will pass by default the CT10nlo.grid to SysCalc - So, I guess for now you can maybe live with that and in due time the behaviour will change if this line is missing not passing anything to SysCalc at all.

Regards

Alexis

Thanks Alexis.

Yes, it would be great if we could turn it off completely.

Could this change in behaviour go into the next release?

Best,

Josh.

To be more clear,

Alexis claim that SysCalc can do that if run in standalone.
I will make a patch (on Friday) to create the correct syscalc output to support this situation.

Cheers,

Olivier

On 07 Oct 2015, at 15:27, Alexis Kalogeropoulos <email address hidden> wrote:

> Question #272136 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/272136
>
> Alexis Kalogeropoulos posted a new comment:
> Discussing with Olivier, currently if the "sys_pdf" is missing, MG will
> pass by default the CT10nlo.grid to SysCalc - So, I guess for now you
> can maybe live with that and in due time the behaviour will change if
> this line is missing not passing anything to SysCalc at all.
>
> Regards
>
> Alexis
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi Olivier,

Is there a patch for this yet?

Best,

Josh.

Sorry,

doing that right now

Olivier
On 12 Oct 2015, at 11:08, Josh McFayden <email address hidden> wrote:

> Question #272136 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/272136
>
> Status: Answered => Open
>
> Josh McFayden is still having a problem:
> Hi Olivier,
>
> Is there a patch for this yet?
>
> Best,
>
> Josh.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Here is the patch:

=== modified file 'madgraph/interface/madevent_interface.py'
--- old/madgraph/interface/madevent_interface.py 2015-10-11 19:18:37 +0000
+++ new/madgraph/interface/madevent_interface.py 2015-10-12 11:13:31 +0000
@@ -4160,6 +4160,12 @@
         card = pjoin(self.me_dir, 'bin','internal', 'syscalc_card.dat')
         template = open(pjoin(self.me_dir, 'bin','internal', 'syscalc_template.dat')).read()
         self.run_card['sys_pdf'] = self.run_card['sys_pdf'].split('#',1)[0].replace('&&',' \n ')
+
+ if self.run_card['sys_pdf'].lower() in ['', 'f', 'false', 'none', '.false.']:
+ self.run_card['sys_pdf'] = ''
+ if self.run_card['sys_alpsfact'].lower() in ['', 'f', 'false', 'none','.false.']:
+ self.run_card['sys_alpsfact'] = ''
+
         # check if the scalecorrelation parameter is define:
         if not 'sys_scalecorrelation' in self.run_card:
             self.run_card['sys_scalecorrelation'] = -1

=== modified file 'madgraph/various/banner.py'
--- old/madgraph/various/banner.py 2015-10-09 10:39:28 +0000
+++ new/madgraph/various/banner.py 2015-10-12 10:40:46 +0000
@@ -1627,7 +1627,7 @@
         self.add_param("xqcut", 0.0, cut=True)
         self.add_param("use_syst", True)
         self.add_param("sys_scalefact", "0.5 1 2", include=False)
- self.add_param("sys_alpsfact", "0.5 1 2", include=False)
+ self.add_param("sys_alpsfact", "None", include=False)
         self.add_param("sys_matchscale", "30 50", include=False)
         self.add_param("sys_pdf", "Ct10nlo.LHgrid", include=False)
         self.add_param("sys_scalecorrelation", -1, include=False)
@@ -1796,6 +1796,7 @@
                 self['use_syst'] = False
                 self['drjj'] = 0
                 self['drjl'] = 0
+ self['sys_alpsfact'] = "0.5 1 2"

Cheers,

Olivier

Thanks Olivier!