Missing photons with Delphes 3.2.0 and default ATLAS card

[Kayla]

Hello,

I have been running MadGraph pp --> ZZ --> eevv events through Pythia 8 and Delphes 3.2.0 (using the ATLAS run card). After running through Pythia 8 and looking at the .hep output, I was able to see photons with large energies (> 10 GeV default cut) that had a status of "1" (did not decay). Therefore, I was expecting to see these photons in the Delphes 3.2.0 output. When running with the default ATLAS card, there were no photons in the output .root file. I tried to run it with the CMS card and I did see photons in the Delphes output.

In an attempt to fix this, I compared the two cards, and in the photon efficiency section of the CMS card, there is the line "set InputArray Calorimeter/eflowPhotons," while the ATLAS card has "set InputArray Calorimeter/Photons." When I tried changing Photons to eflowPhotons in the ATLAS card, the Photons container was filled. I don't know if (or why) this worked.

I then tried installing and running with Delphes 3.1.2. Running my Pythia 8 output through using the default ATLAS card produced photons in the output. When running with both versions of Delphes, I used all default cards and settings. I suspect there is a bug in Delphes 3.2.0, but I am suspicious how it has been unresolved, unless the error is on my end.

[Michele Selvaggi <michele.selvaggi@…>]

In 3cac201f880f085313068627a8b275eab384601e/git:

fixed input collection for photon isolation (close #362, close #657)

[Michele Selvaggi]

There is problem with the photon collection input for isolation in the ATLAS card, it should be fixed now. Could you get the latest Delphes version on git and verify that everything works as expected please?

git clone https://github.com/delphes/delphes.git

Thanks
Michele

[Kayla]

Hello Michele,

The problem is fixed. Running my Pythia8 output with the latest version of Delphes gives me photons in the output root file.
Thank you very much.

Kayla