Early Physics results from LHC

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Multijet event in CMS in first run at 7 TeV 59 jeudi 25 novembre 2010
Jets • Measurement of inclusive jet and dijet cross sections in proton-proton • collisions at 7 TeV centre-of-mass energy with the ATLAS detector • Accepted by EPJC arXiv:1009.5908 60 jeudi 25 novembre 2010
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Early Physics results from LHC 1 Lu
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Physics @ LHC The Standard Model ha
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Some of the physicists’ jargon 3
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Some of the physicists’ jargon
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Some of the physicists’ jargon
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Signal vs background(s) • Signal:
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Measurements vs predictions Predict
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Simulation example 6 jeudi 25 novem
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jeudi 25 novembre 2010 Detector com
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Detector commissioning Understandin
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The ATLAS/CMS detectors at LHC σ/p
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The ATLAS/CMS detectors at LHC 116
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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
Page 79 and 80: Top Full selection applied: Z-Veto,
Page 81 and 82: • m µµ 94 GeV, E T miss = 161 G
Page 83 and 84: First CMS ZZ4µ Event 56 jeudi 25 n
Page 85: Backup 58 jeudi 25 novembre 2010
Page 89 and 90: Inclusive jets • Combine a range
Page 91 and 92: Dijets and multi jets • Leading j
Page 93 and 94: 8-jet event 8 jets with p T >60 GeV
Page 95 and 96: Possible early discovery: anomalies
Page 97 and 98: Possible early discovery: anomalies
Page 99 and 100: Jets and Missing E T The highest ma
Page 101 and 102: 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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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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