Data-Driven Determination of Light Quark Background

1 Data-Driven Determination of Light Quark Background 

The light quark background template is obtained from data using the method introduced in Sect. 4.7. Hadrons satisfying all muon track selection criteria (except for muon identification) are re-weighed with the muon fake probability and used instead of muons to determine the template. The muon fake probability is taken from MC 

The p f distribution of re-weighted tracks in minimum bias events is compared to the one of simulated muons in light quark events in Fig. 6.5. The udsg template determined from data is harder than in simulation. In order to evaluate the systematic uncertainty of the cross-section measurement due to an imperfect background description, the distribution obtained from data as well as from simulation is used in the fitting procedure. 

The result is compared to the simulated fake muon spectrum (solid line) and the re-weighted hadronic track spectrum in simulation (dotted line). The MC distributions are normalized to the number of data events 

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