Epic-backward-hcal-l mailing list

[Leszek Kosarzewski <leszek.kosarzewski AT gmail.com>]

Dear Colleagues Michał, a student at WUT, did a simple check of pion rejection and muon ID and this made us realize an important constraint on the geometry. This is still work in progress, but we see the pion acceptance at around 5% and realized

ZjQcmQRYFpfptBannerStart

This Message Is From an External Sender

This message came from outside your organization.

 

ZjQcmQRYFpfptBannerEnd

Dear Colleagues

Michał, a student at WUT, did a simple check of pion rejection and muon ID and this made us realize an important constraint on the geometry. This is still work in progress, but we see the pion acceptance at around 5% and realized that there may be a lower limit. If we just calculate the fraction of pions going through nHCal (2.5 interaction lengths) or HCal+EMCal (3.5) and not producing a shower this is just 8% and 3% respectively. These pions at higher energy are probably hard to distinguish from muons. So there will be a lower limit for a given thickness. This is a potential argument for increasing the amount of steel if we need to improve pion rejection.

root [2] double b = TMath::Exp(-2.5);
root [3] cout<<b;
0.082085

root [0] double b = TMath::Exp(-3.5);
root [1] cout<<b;
0.0301974

Best regards, Leszek