electron efficiency

[namgyun]

Hello delphes team.
I meet some problem for electron analysis.I know delphes default electron taking efficiency is around 90%.but my taking efficiency is too low.and I now deal with diverse propagator decaying to electron; the propagator mass is variable.in my understanding , high mass propagator makes more electron than low mass propagator.but output is opposite result.
I assume this situation is related with "ptratiomax"so my question iswhat is the ptratiomax definition in delphes cms card? and how to solve this problem?

I'm waiting your kind answer.

[Michele Selvaggi]

Hi,

I did not understand what is exactly your problem.
The parameter "ptratiomax" is a cut-off for how you define an isolated electron.
It corresponds to the "amount" of transverse energy inside a cone around the electron relative to the electron transverse momentum.
If too much energy is found, then the electron is not isolated.
If you want the increase the number of reconstructed electrons, you can:

• increase the value of ptratiomax
• increase the efficiency value in ElectronEfficiency

Also, are you sure the process you are considering is producing enough high pt (central) electrons? To check that you can have a look at the GenParticle branch.

Cheers,
Michele