Fig. 12.

Systematic uncertainty due to event modelling in Monte Carlo generators on the expected jet energy resolution as a function of p _T, for jets with |y|<0.8. The points correspond to absolute differences with respect to the results obtained with the nominal simulation (Pythia MC10). Other event generators are shown as solid triangles (Herwig++) and open circles (Alpgen). Solid squares (Pythia Perugia2010), inverted triangles (Pythia PARP90), and open squares (Pythia8), summarize differences coming from different tunes, cut-off parameters, and program version, respectively. The total modelling uncertainty is estimated from the sum in quadrature of the different cases considered here (shaded area)