Early Physics results from LHC

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Measurements vs predictions Predictions/Simulation Event Generation Tools: MC generators (PYTHIA, ...) Output: final state particles Measurements Collisions Tools: Accelerator (<strong>LHC</strong>, Tevatron ...) Output: final state particles Detector simulation Tools: MC simulators (GEANT) Output: simulated detector response Data acquisition Tools: Detectors (CMS, ATLAS,...) Output: detector response 5 jeudi 25 novembre 2010
Measurements vs predictions Predictions/Simulation Event Generation Tools: MC generators (PYTHIA, ...) Output: final state particles Measurements Collisions Tools: Accelerator (<strong>LHC</strong>, Tevatron ...) Output: final state particles Detector simulation Tools: MC simulators (GEANT) Output: simulated detector response Data acquisition Tools: Detectors (CMS, ATLAS,...) Output: detector response Event reconstruction Tools: Detectors’ software packages (custom made; MC used in algorithms) Output: reconstructed physical objects (electrons, muons, jets ...) 5 jeudi 25 novembre 2010
Page 1 and 2: Early Physics results from LHC 1 Lu
Page 3 and 4: Physics @ LHC The Standard Model ha
Page 5 and 6: Some of the physicists’ jargon 3
Page 7 and 8: Some of the physicists’ jargon
Page 9 and 10: Some of the physicists’ jargon
Page 11 and 12: Signal vs background(s) • Signal:
Page 17 and 18: Measurements vs predictions Predict
Page 19 and 20: Measurements vs predictions Predict
Page 21: Measurements vs predictions Predict
Page 25 and 26: Simulation example 6 jeudi 25 novem
Page 27 and 28: jeudi 25 novembre 2010 Detector com
Page 29 and 30: Detector commissioning Understandin
Page 31 and 32: The ATLAS/CMS detectors at LHC σ/p
Page 33 and 34: The ATLAS/CMS detectors at LHC 116
Page 35 and 36: The ATLAS/CMS detectors at LHC σ/p
Page 37 and 38: Evolution of the Cross-Sections Inc
Page 39 and 40: Physics Objects The CMS detectors a
Page 41 and 42: ECAL energy scale in the barrel the
Page 43 and 44: Missing transverse energy in the ca
Page 45 and 46: M,'%&,H,D05.-3. #$%&'()%*'+,(-+).*
Page 47 and 48: W transverse mass • e or µ with
Page 49 and 50: Z mass peaks • Invariant mass of
Page 51 and 52: Missing transverse energy • E T m
Page 53 and 54: First W → µν events in CMS, Apr
Page 55 and 56: Z → µ + µ − event in CMS q Z
Page 57 and 58: Electroweak: Z & W cross sections Z
Page 59 and 60: W and Z cross section with e and µ
Page 61 and 62: Study of the top quark: one of the
Page 63 and 64: LHC is a tt factory Total productio
Page 65 and 66: Lepton+Jets loose selection • Tri
Page 67 and 68: e+Jets candidate event on July 18 E
Page 69 and 70: eμ candidate DL2 p T (tracks) > 1
Page 71 and 72: The “golden” µµ+jets candidat
Page 73 and 74:
µµ +Jets Candidate … cont’d M
Page 75 and 76:
µµ +Jets Candidate … cont’d M
Page 77 and 78:
Measurement of top cross section
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Top Full selection applied: Z-Veto,
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• m µµ 94 GeV, E T miss = 161 G
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First CMS ZZ4µ Event 56 jeudi 25 n
Page 85 and 86:
Backup 58 jeudi 25 novembre 2010
Page 87 and 88:
Jets • Measurement of inclusive j
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Inclusive jets • Combine a range
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Dijets and multi jets • Leading j
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8-jet event 8 jets with p T >60 GeV
Page 95 and 96:
Possible early discovery: anomalies
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Possible early discovery: anomalies
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Jets and Missing E T The highest ma
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Jets Event with 6 jets with p T in
Page 103 and 104:
Observed event with hardest jet p T
Page 105 and 106:
p T (j 1 )=420 GeV p T (j 2 )=320 G
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!"" #$%$&'()'*+',-(./0&$()' >-K$@L
Page 109 and 110:
Inclusive jet cross-section p T j >
Page 111 and 112:
Cross check of 3-jet mass • Invar
Page 113:
Dilepton events • Count events wi
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Early Physics results from LHC

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