SUSY cross-sections

Hi Jamie,

Did you also contact Prospino collaboration?
I just look at their website and I see the following:

Prospino2 news: 3/26/12 bug for squarks and gluinos at 8 TeV fixed

So did you use the last version of Prospino? If not, please try with
their latest version.

Cheers,

Olivier

On 05-juil.-12, at 16:56, Jamie Tattersall wrote:

> Question #202338 on MadGraph5 changed:
> https://answers.launchpad.net/madgraph5/+question/202338
>
> Description changed to:
> Hi,
>
> I have noticed for a while that the cross-sections calculated by
> MadGraph seem suspiciously off in the MSSM for strong production
> compared to Prospino at leading order. For a while I have ignored this
> as I thought it's probably just pdf's, a scale uncertainty etc.
> However
> after investigating more, it seems like real differences occur (factor
> of 3 for diagrams including gluinos). Interestingly, this only seems
> to
> be the case when gluinos are included in diagrams. I was wondering if
> discrepancies had been investigated and if there is an explanation.
>
> For example, I take the gluino and 5 flavours of squarks to be 500
> GeV.
> All have been calculated with CTEQ6L1 at LO (CTEQ6.6M at NLO).
>
> Squark production with decoupled gluino (good agreement),
> MG = 0.24, Prospino (LO) = 0.26, Prospino (NLO) = 0.46 (all
> in pb)
>
> Squark production with gluino diagrams (2.4 x diff),
> MG = 0.94, Prospino (LO) = 2.25, Prospino (NLO) = 2.75 (all
> in pb)
>
> Squark gluino production (3 x diff),
> MG = 1.56, Prospino (LO) = 4.74 Prospino (NLO) = 6.56 (all
> in pb)
>
> Gluino gluino production (2.8 x diff),
> MG = 0.28, Prospino (LO) = 0.80 Prospino (NLO) = 1.74 (all
> in pb)
>
> Many thanks,
> Jamie
>
> --
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Hi Olivier,

Sorry, I should have said that all the numbers I quoted above are for 7TeV.

I also get the same numbers using NLL-Fast.

Many thanks,
Jamie

Hello Jamie,

Can you please inline your proc_card_mg5.dat here?

All the best,
Johan

Hi,

Here's the example for squark gluino production but I can add any of the others,

Many thanks,
Jamie

#************************************************************
#* MadGraph 5 *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 1.3.33 2012-01-25 *
#* *
#* The MadGraph Development Team - Please visit us at *
#* https://server06.fynu.ucl.ac.be/projects/madgraph *
#* *
#************************************************************
#* *
#* Command File for MadGraph 5 *
#* *
#* run as ./bin/mg5 filename *
#* *
#************************************************************

import model mssm
define squ = ul ur ul~ ur~ dl dr dl~ dr~ cl cr cl~ cr~ sl sr sl~ sr~
generate p p > squ go
output SqGlu_Basic2

How about param_card.dat and run_card.dat? If you prefer, you can send to alwall _at_ fnal.gov.

Thanks!
Johan

Hi Johan,

I'm really sorry to have wasted your time but I've just found the issue. I was re-editing the cards by hand and didn't change the widths of the particles. This solves the problem.

Sorry again!

Many thanks,
Jamie

Excellent. Thanks for letting us know!

Johan