Early Physics results from LHC

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Early Physics results from LHC Physics @ LHC Some of the physicists’ jargon Evolution of the Cross-Sections LHC physics Objects W an Z study Top at the LHC Multijet event in CMS in first run at 7 TeV Conclusion jeudi 25 novembre 2010 1 Ludwik Dobrzynski - LLR Ecole Polytechnique - CNRS-IN2P3
Physics @ LHC The Standard Model has been deeply tested at HERA, LEP and Tevatron and with success! … but the essential physics motivations and questions remain. They concern : Electroweak Symmetry Breaking Hierarchy of Fundamental Interactions Unification and Extended Symmetries The absence of BSM discoveries up to now, induce that everything is possible and LHC must be ready for surprises During the last decades, the universe has become much complicated (dark Matter, dark energy, neutrino masses … !) 2 jeudi 25 novembre 2010
Page 1: Early Physics results from LHC 1 Lu
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 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
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First W → µν events in CMS, Apr
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Z → µ + µ − event in CMS q Z
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Electroweak: Z & W cross sections Z
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W and Z cross section with e and µ
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Study of the top quark: one of the
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LHC is a tt factory Total productio
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Lepton+Jets loose selection • Tri
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e+Jets candidate event on July 18 E
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eμ candidate DL2 p T (tracks) > 1
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The “golden” µµ+jets candidat
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µµ +Jets Candidate … cont’d M
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µµ +Jets Candidate … cont’d M
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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
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Backup 58 jeudi 25 novembre 2010
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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
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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
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Observed event with hardest jet p T
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p T (j 1 )=420 GeV p T (j 2 )=320 G
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!"" #$%$&'()'*+',-(./0&$()' >-K$@L
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Inclusive jet cross-section p T j >
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Cross check of 3-jet mass • Invar
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Dilepton events • Count events wi
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Early Physics results from LHC

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