Controlling cuts in Madgraph 5

Dear Saha,

First sorry for the late reply.

> I noticed that a comment on line 85 of run_card.dat says "etmiss/ptll/ptheavy/ht/sorted cuts always apply".

This comment are linked to:
#**********************************************************
# Apply pt/E/eta/dr/mij cuts on decay products or not
# (note that etmiss/ptll/ptheavy/ht/sorted cuts always apply)
#**********************************************************
   T = cut_decays ! Cut decay products
If set on False, the pt/E/... will not be used for electron/muon/jets/...
coming from a on-shell decay.
For example for the following process:
p p > w+ e+ e-, w+ > e+ ve
If you set
  F = cut_decays ! Cut decay products
then the two electron will not have the same cut on pt/E/.…
while etmiss/ptll/ptheavy/ht/sorted will occur for both electrons.

> I would like to know if it is possible to switch off these cuts also by explicitly setting the relevant variables to appropriate values.

You can set all those value to zero/-1 to switch them off.
This will not introduce problem/error in the computation (But if you matrix-element is divergent in one of those variables of course).

Cheers,

Olivier

On Sep 24, 2013, at 11:01 PM, Pratishruti Saha <email address hidden> wrote:

> New question #236296 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/236296
>
> Dear MadGraph Team,
>
> I am new to MadGraph and I've just started with MadGraph5 version 1.5.12.
>
> I noticed that a comment on line 85 of run_card.dat says "etmiss/ptll/ptheavy/ht/sorted cuts always apply".
> I would like to know if it is possible to switch off these cuts also by explicitly setting the relevant variables to appropriate values.
>
> If yes, can this be done safely (i.e. without introducing any errors in the calculation) and which are the relevant variables that need to be set? I am guessing that the relevant variables would be (in run_card.dat)
>
> misset (line 106)
> ptheavy (line 107)
> missetmax (line113)
> the block titled "Minimum and maximum pt for 4-momenta sum of leptons" (lines 179-180)
> the block titled "Control the pt's of the jets sorted by pt" (lines 191-198)
> the block titled "Control the pt's of leptons sorted by pt" (lines 203-210)
> the block titled "Control the Ht(k)=Sum of k leading jets" (lines 214-223)
>
> Is this correct? Could you please confirm?
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Dear Olivier,

Thanks for the reply.
This question was a precursor to the actual question that I wanted to ask.
I have now posted that at https://answers.launchpad.net/madgraph5/+question/236617.
Improper implementation of cuts could have been one of the causes for that problem.
Hence I chose to clarify this issue first.

regards,
Pratishruti