how to worsen the performance of deltaR of the jets?

[rfrances@…]

We are trying to reproduce the cutflow of 1110.2693 tab. 1 using delphes. All the efficiencies are reproduced within 20%, only the requirement on deltaR among some particular jets is off by a factor 2.

In particular Delphes gives a result that is much closer to the partonic level result. As the cuts and jet definition cannot be changed (we want to reproduce ATLAS analysis), we would like to "worsen" Delphes resolution on the direction of the jets.

In the manual nor in the cards I could not find a parameter of direct relevance of the angular resolution (I assume that eta and phi are measured from angular information).

How could one get a worse deltaR changing delphes parameters?

Thanks for your replies
Roberto

[favereau]

I guess one way would be to change the calorimeter tower density (i.e less towers per eta-phi range). Have a look at variables TOWER_number, TOWER_eta_edges, TOWER_dphi.

[rfrances@…]

Hi, that's the way we guessed as well. The test is in progress with twice larger eta and phi cells.
I'll report what happens, it looks like an interesting tuning ...
Ciao
Roberto

[rfrances@…]

So, we see some degradation of the angular variable, thanks for poiting out the relevant parameters. We working on the tuning right now.
Thanks
Roberto