atlas status & physics overview

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ATLAS status & physics overview. ATLAS and ATLAS UK First look with a new detector First look in a new kinematic regime QCD plus…. Jon Butterworth (UCL. ATLAS UK. ATLAS UK is around 330 people in 12 institutes: - PowerPoint PPT Presentation

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ATLAS status & physics overviewJon Butterworth (UCLATLAS and ATLAS UKFirst look with a new detectorFirst look in a new kinematic regimeQCD plus

20/9/2010JMB/ATLAS/Coseners2

ATLAS UKATLAS UK is around 330 people in 12 institutes:Birmingham, Cambridge, Glasgow, Edinburgh, Lancaster, Liverpool, Manchester, Oxford, QMUL, RAL, RHUL, Sheffield, Sussex, UCL.Includes about 50 PhD students. Major responsibilities in tracking, trigger, software & computing.3Many leadership positions over the years (CB chair, project leaderships, coordination of physics groups).Notable recent examples: T. Wengler, run coordinator for first beam data.D. Charlton, physics coordinator and now deputy spokesperson.From 1 Oct, 5/16 physics coordinator positions held by ATLAS UK physicists 20/9/2010JMB/ATLAS/Coseners

Inner Detector (||30 GeV 20/9/2010JMB/ATLAS/Coseners38

ATLAS-CONF-2010-085QCD plus: Vector bosons20/9/2010JMB/ATLAS/Coseners39

Cross sections and charged lepton asymmetry (W)ATLAS-CONF-2010-051QCD plus: Vector bosons20/9/2010JMB/ATLAS/Coseners40

Cross sections (Z)ATLAS-CONF-2010-076

QCD plus: Vector bosons

20/9/2010JMB/ATLAS/Coseners41

QCD plus: Vector bosons20/9/2010JMB/ATLAS/Coseners42

QCD plus: Top

20/9/2010JMB/ATLAS/Coseners43

Jet pT > 20 GeV (anti-kt)At least one b-tagged jet

ATLAS-CONF-2010-087One of the top candidates

20/9/2010JMB/ATLAS/Coseners44QCD plus: SearchesSeach for resonances in dijet mass distribution.q* mass limit ~ 1.26 TeV

20/9/2010JMB/ATLAS/Coseners45arXiv:1008.2461 (accepted by PRL)

SearchesBackground determinations for SUSY (lepton, jets, missing ETJet angular distributionsW, multilepton final statesAdvancing into (or towards) new territory20/9/2010JMB/ATLAS/Coseners46SummaryDetector, trigger, software & computing performing well, and generally well understood (for this early stage)Tracking detectors well alignedDetailed studies of the soft QCD environment, and MC tuning, well underwayJet energy scale determined to ~6-10% 6% for high pT centralLuminosity uncertainty 11%Jet cross sections measuredagree with NLO QCD at the ~40% level. W & Z cross sections and asymmetries measuredStudies of jet+W,Z well advanced, t+jets underwayNew physics searches exploiting the understanding of QCD and of the detectors already going beyond previous experiments

20/9/2010JMB/ATLAS/Coseners47Extra info: ETmiss

20/9/2010JMB/ATLAS/Coseners48

The ETmiss distribution for minbias events, and the resolutionSee ATLAS-CONF-2010-057 See ATLAS-CONF-2010-086 for tau performance.. Status 20/9/2010JMB/ATLAS/Coseners49END20/9/2010JMB/ATLAS/Coseners50Particle correlationsPlot the f distribution of all tracks relative to the highest pT track.

20/9/2010JMB/ATLAS/Coseners51ATLAS-CONF-2010-082

Particle correlationsPlot the f distribution of tracks relative to the highest pT track separately with same sign and opposite sign h, and substract.

20/9/2010JMB/ATLAS/Coseners52ATLAS-CONF-2010-082

ATLAS-CONF-2010-082Focus on diffractionCompare sample with exactly one side hit in the MBTS against those with any/both hitEnhances single diffractive in the one-side sample

20/9/2010JMB/ATLAS/Coseners53ATLAS-CONF-2010-048

Proportional of single-sided events in data =

Hard QCD : Jet Shapes20/9/2010JMB/ATLAS/Coseners54

ATLAS-CONF-2010-0494 GeV < Track jet pT < 6 GeV 15 GeV < Track jet pT < 24 GeV Extend to lower pT

28/9/2010JMB/ATLAS/Trento55

ATLAS-CONF-2010-04620/9/2010JMB/ATLAS/Coseners56

[GeV]jet, EMTp20 30 40 210 2102 310

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1.4 , R=0.6 jetsTAntiK| < 0.8 !0.3 < || < 2.8 !2.1 < |

Monte Carlo QCD jetsATLAS Preliminary

[GeV]jetTp20 30 40 210 2102 310

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00.020.040.060.08

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