pileup for ATLAS

[Jessica Metcalfe]

Hi,
I am running Delphes 3.1.1 on .hep files generated from MadGraph. I find that when I run Delphes with the plain ATLAS card (delphes_card_ATLAS.tcl) I see a reasonable number of generator level and reconstructed jets. However when I use the card with pileup delphes_card_ATLAS_PileUp.tcl, but the mean number of pile-up events turned to 0, I get very few reconstructed jets, so that I am losing all signal events in a sample that is pure signal. I also ran a previous version of Delphes with the Snowmass pileup cards and had no issue there.

For the same .hep sample with the different cards I get:
delphes_card_ATLAS_140PileUp.tcl (mean pile-up = 0):
genJets = 280,231 entries
Jets = 3,636 entries

delphes_card_ATLAS.tcl:
genJets = 280,231 entries
Jets = 126,860 entries

I appreciate any help you can give.

Cheers,Jessica

[Michele Selvaggi]

Hi Jessica,

the bug you are mentioning has been corrected in the latest release 3.1.2.
Could you please try with that?

Thanks,
Michele

[Tien-Tien]

Hi,

On a similar note, the Snowmass pileup card do not seem to work with 3.1.2. The error message I get is: ERROR: can't access input list 'Calorimeter/eflowTowers' for different modules. I am using the same card as in ​http://arxiv.org/pdf/1308.1636v2.pdf where they use Delphes 3.0.9. Do you have any suggestions for how I can remedy this or what I am doing wrong?

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tien-tien