6 Calorimetry
237
Fig. 6.28 Combined uncertainty in the jet energy scale (JES) of fully calibrated jets as a function
of jet p T in the central region of the ATLAS calorimeter system [61]
Fig. 6.29 Jet resolution for di-jets events in the CMS calorimeter reconstructed with the particle
flow (red triangles) and the calorimeters (blue open squares) [63]
their natural width, i.e. with ~2 GeV (FWHM). Given that these jets are composed
on average of ~60% hadrons, ~30% photons (the rest being shared by slow neutrons,
neutrinos, muons, . . . ) a rather conventional resolution of σ (em) ~ 0.15/
√
E(GeV)
and σ (hadronic) ~ 0.5/
√
E(GeV) would suffice, provided the individual energy
deposits can be correctly associated with the individual particles measured in the
charge particle spectrometer. This places a new level of performance requirements
237
Fig. 6.28 Combined uncertainty in the jet energy scale (JES) of fully calibrated jets as a function
of jet p T in the central region of the ATLAS calorimeter system [61]
Fig. 6.29 Jet resolution for di-jets events in the CMS calorimeter reconstructed with the particle
flow (red triangles) and the calorimeters (blue open squares) [63]
their natural width, i.e. with ~2 GeV (FWHM). Given that these jets are composed
on average of ~60% hadrons, ~30% photons (the rest being shared by slow neutrons,
neutrinos, muons, . . . ) a rather conventional resolution of σ (em) ~ 0.15/
√
E(GeV)
and σ (hadronic) ~ 0.5/
√
E(GeV) would suffice, provided the individual energy
deposits can be correctly associated with the individual particles measured in the
charge particle spectrometer. This places a new level of performance requirements