CERN-THESIS-2012-153 26/07/2012 - CERN Document Server

decays is limited due to limited number of MC events available, the behavior of the simulated efficiency
after ≈ 150 GeV can not be studied. Because of this, events with muons with pT > 150 GeV are vetoed.
The trigger efficiencies are provided as a function of η and φ, and separated into three pT bins, [20-60 GeV],
[60-120 GeV], and > 120 GeV.
∈
∈
1.4
1.2
1
0.8
0.6
0.4
0.2
mc
data
0
­3 ­2 ­1 0 1 2 3
1.2
1
0.8
0.6
0.4
0.2
0
(a)
η (Probe µ )
20 40 60 80 100 120 140 160 180 200
(c)
mc
data
p (Probe µ ) [GeV]
T
∈
∈
1.4
1.2
1
0.8
0.6
0.4
0.2
0
1.2
1
0.8
0.6
0.4
0.2
0
­3 ­2 ­1 0 1 2 3
(b)
mc
data
φ (Probe µ )
20 40 60 80 100 120 140 160 180 200
(d)
mc
data
p (Probe µ ) [GeV]
T
Figure 5.2: Comparison of trigger efficiency for data (black) and MC (red) as a function of (a)η, (b)φ and
pT of muons in the (c) barrel and (d) end-caps.
The muon identification efficiency is also extracted from a fit to the invariant mass of Z → µµ events. No
dependence is observed on the isolation cuts. These scale factors are constant for all muons and measured
in two periods of data taking. The muon identification efficiency measured in the first 0.7 fb −1 of data are
shown in Figure 5.3.
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