Changes between Version 7 and Version 8 of Private/RefereeComments/Section_2
- Timestamp:
- Oct 1, 2013, 11:57:53 AM (11 years ago)
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Private/RefereeComments/Section_2
v7 v8 27 27 >>> has simply an impact on the (eta,phi) resolution of the final observables. 28 28 >>> As it is, the pessimistic spatial resolution assumed in ECAL only affects photons, 29 >>> since for electrons we have the track information and we therefore assume infiniteresolution.29 >>> since for electrons we have the track information and we assume infinite (eta,phi) resolution. 30 30 >>> If there was a consistent difference in the performances due the this calorimeter simplification, 31 31 >>> it would first appear in the calorimeter resolutions, which seems to be correctly reproduced. 32 >>> The "computational reasons" are that with the current state of the implementation, the combinatorics are 33 >>> reduced, and this has an impact on the the jet clustering procedure, especially in the presence of pile-up. 34 32 35 33 36 Par 3: … … 36 39 promptly to two photons (i.e., they are not ”long-lived particles reaching the 37 40 calorimeters”. Suggest to drop ”and neutral pions”. 41 42 >>> addressed. 38 43 39 44 L3-7: ”while charged pions and other neutral hadrons deposit all their … … 54 59 implementation might need serious revision if what is currently described is 55 60 indeed implemented. 61 62 >>> 63 56 64 57 65 Eq 2.1 : It is not clear whether the same resolution is used for ECAL and … … 92 100 93 101 Long-lived particles reaching the calorimeters deposit a fixed fraction of their energy in the corresponding ECAL ($f_{ECAL}$) and HCAL ($f_{HCAL}$) cells. 94 Electrons, photons and neutral pions leave all their energy in ECAL, while charged pions and other neutral hadrons deposit all their energy in HCAL. 95 Long-lived particle such as kaons, pions and $\Lambda$'s are considered stable by most event generators. 96 In \DELPHES, such particles are assumed to deposit a fixed fraction of their energy both in ECAL and HCAL. 97 By default, $f_{ECAL}$ is set to $30\%$ and $f_{HCAL}$ to $70\%$ --- according to their expected decay products --- but this can be tuned by the user. 98 Finally, muons, neutrinos and neutralinos, do not deposit anything in the calorimeters ($f_{ECAL}=f_{HCAL}=0$). 102 By default in \DELPHES electrons and photons leave all their energy in ECAL ($f_{ECAL}=1$), hadrons deposit all their energy in HCAL ($f_{HCAL}=1$), 103 with the exception of kaons and $\Lambda$ that share their energy deposit between ECAL and HCAL ($f_{ECAL}=0.3$ and $f_{ECAL}=0.7$), while muons, neutrinos and neutralinos, do not deposit anything in the calorimeters. 104 In practice, the user has the freedom to change the default setup, and define for each long-lived particle more accurate values for $f_{ECAL}$ and $f_{HCAL}. 99 105 100 106 The resolution of the calorimeters is parametrised as a function of the particle energy and the pseudo-rapidity:
