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

|η| < 1.8, a presampler detector is used to correct for the energy lost by electrons and photons upstream
of the calorimeter. In the transition region between the barrel and the end-cap calorimeters, |η| ∼ 1.45,
the detector response is deteriorated with respect to the rest of the acceptance. This “crack region” is not
used for photon identification nor for precision measurements for electrons. The resolution goal of the EM
calorimeter, as quoted in Table 3.2, is σE/E = 10%/ √ E ⊕0.7%. This is needed to achieve a mass resolution
EM calorimeter barrel end-cap
coverage |η| < 1.465 1.375 < |η| < 3.2
longitudinal segmentation 3 samplings 3 sampling 1.5 < |η| < 2.5
2 sampling 1.375 < |η| < 1.5
2.5 < |η| < 3.2
granularity (∆η × ∆φ)
sampling 1 0.003 × 0.1 0.025 × 0.1 1.375 < |η| < 1.5
0.003 × 0.1 1.5 < |η| < 1.8
0.003 × 0.1 1.8 < |η| < 2.0
0.003 × 0.1 2.0 < |η| < 2.5
0.1 × 0.1 2.5 < |η| < 3.2
sampling 2 0.025 × 0.025 0.025 × 0.025 1.375 < |η| < 2.5
0.1 × 0.1 2.5 < |η| < 3.2
sampling 3 0.050 × 0.025 0.05 × 0.025 1.5 < |η| < 2.5
Presampler barrel end-cap
coverage |η| < 1.52 1.5 < |η| < 1.8
longitudinal segmentation 1 sampling 1 sampling
granularity (∆η × ∆φ) 0.025 × 0.1 0.025 × 0.1
Hadronic tile barrel end-cap
coverage |η| < 1.0 0.8 < |η| < 1.7
longitudinal segmentation 3 sampling 3 sampling
granularity (∆η × ∆φ)
samplings 1 and 2 0.1 × 0.1 0.1 × 0.1
samplings 3 0.2 × 0.1 0.2 × 0.1
Hadronic LAr end-cap
coverage 1.5 < |η| < 3.2
longitudinal segmentation 3 samplings
granularity (∆η × ∆φ) 0.1 × 0.1 1.5 < |η| < 2.5
0.2 × 0.2 2.5 < |η| < 3.2
Forward calorimeter end-cap
coverage 3.1 < |η| < 4.9
longitudinal segmentation 3 samplings
granularity (∆η × ∆φ) ∼ 0.2 × 0.2
Table 3.4: Main parameters of the ATLAS calorimeters [68].
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