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Figure 6.3: Result of a Function Test without errors.φηrank{ }} {{ }} {{ }} {1514131211109876543210Figure 6.4: Encoding of an e/γ candidate from the GCT. Bit 15 is used for synchronizationinformation. The linked red bits indicate the short circuit encountered.73
Figure 6.5: |η| distribution of non-isolated e/γ candidates in events from run 112265matching the L1 SingleEG5 algorithm.Since the trigger masks were configured to accept objects with a rank 1 ≥ 10 and theerror added 32 to the rank of all candidates, odd-η candidates of arbitrary rank wereaccepted. Figure 6.5 clearly shows the resulting skewed |η| distribution. Comparingthe recorded events with the emulator shows a large number of disagreements forelectron algorithms, see Fig. 6.6. Figure 6.7 shows the results of an interconnectiontest with the faulty board.6.2.3 Missing Muon “Mystery”The error described in the previous section was traced to a faulty connection on theGTL board, which was then replaced by a spare. A further analysis of the output fromthe data/emulator comparison revealed some disagreements in the muon algorithmsas well (see Fig. 6.8). The number of disagreements for single muon algorithms wassmall, but the double muon algorithm showed a much higher number of disagreements.Initially, this was puzzling since there were no known problems with the muon part ofthe system.At the time, the interconnection test as implemented in the TestCell did not yetexercise the muon inputs. When this functionality was added, it revealed that theentire MU3MU4 input of the GTL board consistently read as zero, regardless of theinputs sent from the GMT. Upon analysis of the board, this fault was traced to a1 The numerical value in the name of the trigger algorithm, L1 SingleEG5, refers to the e/γ E T ,which in this case was converted to hardware units with a linear scale of E T = rank/2 GeV.74
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3.2.10 CMS Online Software . . . .
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factor. The selected events are the
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Figure 2.1: Expected dijet mass spe
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Figure 2.3: Left: Dilepton mass dis
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W −Z, γZ, γZ, γW +Z, γFigure
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ggHVHg(a)g(b)q¯q¯qHHV ∗q(c)qq(d
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Events per 4 GeV bin450400350300250
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3 Experimental Setup3.1 Large Hadro
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8.3 T. Such high fields were not ac
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luminosity) and limited storage ban
Page 28 and 29: Figure 3.4: Layout of the CMS pixel
Page 30 and 31: Figure 3.6: Transverse section illu
Page 32 and 33: Figure 3.8: HCAL jet energy resolut
Page 34 and 35: staggered by a half-cell each. A dr
Page 36 and 37: acceptance signal is distributed to
Page 38 and 39: Figure 3.11: Generic state machine
Page 40 and 41: Figure 3.12: Components of a CMSSW
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Page 44 and 45: In addition, the GCT calculates a n
Page 46 and 47: Figure 4.4: η boundary between the
Page 48 and 49: Figure 4.5: Organization of the DTT
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Page 52 and 53: oards making up the GT and sends th
Page 54 and 55: • ESProducers: components that re
Page 56 and 57: 5 Pattern Testing for the Level-1 G
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Page 60 and 61: RAW DIGIL1GctJetCandCollection (for
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Page 72 and 73: Test Execution PanelThe test execut
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Page 80 and 81: Figure 6.6: Disagreements in e/γ a
Page 82 and 83: Figure 6.9: TestCell output from an
Page 84 and 85: Bibliography[1] Abraham Pais. Inwar
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