photon kinematics shift

[Jung Chang]

Dear Sir,

I used Delphes v3.4.0 to simulate diphoton di b quark events, the photon pair after delphes simulation will be more energetic than in generator level.
In my simulation, I had add Jet fake photon rate, shift jet energy for b quark tagging, photon and b-tagging efficiency. How can I fix my delphes card to get better results?
I attach my delphes card. Thanks!

[Michele Selvaggi]

Hi,

I don't see any shift by using your card on a photon gun sample.
Please attach the "photon_delta_energy.png" file produced by the following command:

root -b -q examples/Example3.C'("your_root_file.root")'

Also, by looking at your card you aren't applying any fake rate since the JetFakeParticle/photons collection is not going anywhere. That should be merged (via the Merger module) to the PhotonIsolation module and the merged collection should be fed to the UniqueObjectFinder as the final photon collection.

Michele

[Jung Chang]

Hi Michele!

Thanks for quick reply, I got it.

I checked the "Photon_delta_energy.png" it seems my fixing make photon smearing a little boarder. But it is still OK.

I also fix the module to add Jetfake contribution.

Thanks!