Photon ioslation- how to do it?

[mwhi@…]

Hi,

I'm trying to get photon isolation working in Delphes, since it isn't implemented directly. The aim is to reproduce a recent ATLAS study, where they impose an isolation condition on photons by requiring that all extra clusters (bar the photon candidate cluster) in a cone of deltaR=0.2 around the candidate cluster have a total ET deposit < 5GeV.

I've tried doing this in Delphes by hacking the code to store the output of "IsolationSumEt" for photons. If I understand this correctly, it will give the total ET in a cone of 0.2 around the photon eta,phi position (I set the cone to 0.2 in the detector card). I then subtract the photon PT in my analysis code and compare this to 5 GeV.

The numbers look strange though. Is there any reason why this shouldn't work?

Cheers,

Martin

[Pavel Demin]

Photon isolation is now implemented in Delphes 3.