Let me clarify all of this.

> For the diphoton channel: Signal regions are |η| < 1.44, and 1.57 < |η| < 2.50

Those consist indeed in the pseudorapidity requirements on the signal photons.

> For the τ+τ- channel: Signal regions are eτh, μτh and τhτh decay channels

Correct. Here, all potential decay modes of the pair of taus are considered. They are 3 of them:
 - τ > e + neutrinos;
 - τ > mu + neutrinos;
 - τ > jets + neutrino (this corresponds to what is called a hadronic tau τ<sub>h</sub>, which has the largest probability to occur).

Since we have two taus, we have 3 potential channels after enforcing the presence of one hadronic tau (modes with two electrons, two muons or one electron and one muon yield too few potential signal events because of the small decay probability).

> My undestandting of signal region eτh is that:
h (higgs) decays into τ+τ- (tau and anti-tau), and then that the τ+ decays into an electron (+neutrinos), while the +τ- decays into hadrons.
Is this correct?

This could also be the opposite, as here, the charge is not considered. Therefore, what is called an electron could also be a positron.

> Should the program generate histograms?

If histograms are declared as mentioned in the relevant posts, text files with the histogram data will be generated after running the program. We can safely include the histograms of figure 4.

> Show the program generate cut flow reports?

All cuts must be appropriately implemented, and as detailed as possible to facilitate the validation. We will discuss this in greater details in a month or so.

> Do you have any sample data that I could run the program against?

I think I can find the Z'-2HDM model from the signal of figure 4. This is actually what we will learn in the next step of this project: how to generate samples to validate what we are coding  :)