Contents:

- for tagging purposes (see events identification)
- for calibration: invariant mass of the reconstructed jets M (see calibration algorithms)

cmsrel CMSSW_3_3_4 cd CMSSW_3_3_4/src/ cmsenv cvs co -d HiggsAnalysis/TTBarAnalysis UserCode/Bicocca/HiggsAnalysis/TTBarAnalysis cvs co -d PhysicsTools/NtupleUtils UserCode/Bicocca/PhysicsTools/NtupleUtils

cd HiggsAnalysis/TTBarAnalysis scramv1 b

Main idea: invariant mass of the reconstructed jets M.

Jet correction coefficients are defined by

where is the reconstructed momentum of the jet, is the correct momentum of the jet and

with = / and = /

- MiB : Minuit Bare minimization
- kUpdate
- RUL3 : Random Update L3
- SL3: Squared L3
- RUFit : Random Update Fit
- SFit: Squared Fit

Result: still invariant mass underestimation!

Result: invariant mass overestimation!

Why random update? L3 method works fine for "intercalbrations", that is the mean value of *k* is 1. For jet corrections that is not the truth, then, if for example every k should be about 2, we have about 4 ( is proportional to ) and if every *k* is updated then the mass will be overestimated by a factor 4, and so on, jumping around the right mass but never approaching it.

Result: not performing!

Algorithm | pT Reco / pT MC vs pT Reco | pT Reco / pT MC vs η | Invariant Mass vs pT Reco | Invariant Mass |
---|---|---|---|---|

MiB | ||||

kUpdate | ||||

RUL3 | ||||

SL3 | ||||

SFit |

-- AndreaMassironi - 20-Jan-2010

Topic revision: r3 - 2010-01-21 - AndreaMassironi

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