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/photons collection 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!