ATLAS FCPPL Project ACC/IN2P3(CPPM, LAL, LPNHE) Emmanuel MONNIER CPPM

1. ATLAS FCPPL ProjectACC/IN2P3(CPPM, LAL, LPNHE)Emmanuel MONNIERCPPM FCPPL 3rd workshopIPN Lyon 8 April 2010

3. η=-ln(tan(Θ/2))

5. ACC(IHEP/SDU/USTC/NJU)-IN2P3(CPPM/LAL/LPNHE) • Very strong cooperation program between the Atlas Chinese Cluster and CPPM, LAL and LPNHE since several years: • Higgs studies (through γ γ or WW final states) (see Yuan Li talk) • Higgs and Susy searches (through ttbar, leptons and jets final states) (see Lu Feng talk) • Di-boson studies (see Liu Yanwen talk) • Top properties (see Shan LianYou talk) • Performance studies (E/gamma - Jet/Missing Et – B tag – Trigger) (see below and in following talks) • Work for Higgs production cross section Atlas note (H. Zhang/S. Muanza) • Silicon detector R&D (see Zhao Lei talk) • Numerous presentation in Atlas meetings as well as in internal, public/conf notes and publications.

6. ACC(IHEP/SDU/USTC/NJU)-IN2P3(CPPM/LAL/LPNHE) • 2009/2010: first collision data (0.9, 2.36 then 7TeV) LHC at 7TeV for the next 2 years and 1fb-1 expected • Shift in physics expectation and focus on data analysis • Performance studies: E/gamma, Jet/Missing Et, B tag, μ, Trigger… • then W, Z, top, di bosons, SUSY, Higgs…

7. Nov 23rd run Timing Tile Relative timing to ~1ns with splash events: early collision data selection

8. Beam Splash Event Analysis (1) X.F. Ruan (joint PhD student of LAL & IHEP), D. Fournier, Z. Zhang (LAL) Motivation: Use beam splash events to cross-check recent results based on cosmic muon events in terms of drift time and gap uniformity of LAr calorimeter (arXiv:1002.4189v1 [physics.ins-det]) Comparison: Both based on pulses with 32 samples

9. Beam Splash Event Analysis (2) Example Results: Atlas work in progress Middle layer Shift (mm) Gap uniformity (shift): excellent agreement Splash Cosmic Atlas work in progress Back layer Drift time (ns) Cosmic Drift time: Some difference observed & under investigation Splash

10. L1 Calo Trigger L1 Calo system has expected behavior Separate trigger & readout processing High Et Resolution < 5% designed 1GeV bit steps Tight noise suppression (2009) (also Jet: 0.4x0.4, η x φ) Lowest EM:0.1x0.1, η x φ

11. Jet Direction Tracks • Decay Length Significance: • Performance studies • Correlation between Btag estimator studies • Miss-tag rate estimate from data • Discrimination Power: • Heavy Flavor Jet: tend to be positive • Light Flavor Jet: presence of a secondary vertex (resolution effect of light jet) • In parallel, tracking DPD maker validation (on data) Secondary Vertex Primary Vertex SV0 b tag studies Bai Yu (joint PhD student of CPPM & IHEP), L. Feligioni, L. Shan, L. Vacavant

12. RSV <50mm cut on performance improvement Atlas work in progress

13. SV0 weakly correlated with other tag variables (light jets) SV0 Negative Region SV0 Positive Region Atlas work in progress • Study now focus on collision data as well to study miss-tag rate

14. γγ invariant mass spectrum ETcluster > 0.4 GeV PTpair > 0.9 GeV f1>0.1 Dedicated calibration for low ET photons Data: mπ0 =134.0±0.8stat MeV σ = 24.0 MeV MC: mπ0 =132.9±0.2stat MeV σ = 25.2 MeV Nbr π0 = 1.34±0.02stat X 104 ETcluster > 0.8 GeV PTpair > 2.2 GeV Track veto cluster with matched track Data: mη0 = 527±11stat MeV MC: mη0 = 544±3stat MeV Width and position well described

15. PT γe+e-> 0.9 GeV Conversion: Reconstructed tracks with hits in silicon detectors π0 mass peak with γ (calo) + γ(→e+e-) Material before EM calo: => energy loss to be corrected in EM calo calibration: Amount of material to know => photon conversion: (40% probability @ η=0) To be recovered e- e+ γ conversion point R ~ 30 cm (1st SCT layer) pT (e+) = 1.75 GeV, 11 TRT high-threshold hits pT (e-) = 0.79 GeV, 3 TRT high-threshold hits

16. Physics is now at our door !

17. pT(e+) = 34 GeV, ETMiss = 26 GeV, MT = 57 GeV, ηe+ = -0.42

18. pT(μ+) = 29 GeV, ETMiss = 24 GeV, MT = 53 GeV, ημ+ = 0.66

19. 2009 ATLAS ACC-IN2P3 cooperation heavily involved in early data analyses • Co-PhD : • B. Yu, CAS funded (10 Months ended in 2009)(CPPM/IHEP), • L. Yuan (French Embassy funded)(LPNHE/IHEP), • X. Ruan CAS funded (started 09/09) (LAL/IHEP), • S. Li CSC funded (started 09/09)(CPPM/USTC), • + shorter term student visit (Z. Zhao) • Senior Physicists (Y. Liu, F. Lu) visit at CPPM (1 year, 6 months), H. Zhang Postdoc at CPPM, French Seniors Physicist visit at IHEP and USTC, Continuous cooperation work between C. Zhu (SDU) and CPPM physicists (P. Pralavorio, F. Hubaut). • Many presentations at ATLAS meetings by students and senior physicists (Chinese and French) and active contribution to Internal, Pub and Conf notes on early data analysis.

20. 2009 In parallel: • Started a strong SLHC Silicon detector R&D cooperation program between ACC and CPPM: • Senior scientists visit (6 Months) at CPPM: J. Luo (IHEP) and L. Zhao (USTC) already some achievements with contribution ASIC and test bench design and test beam participation (see L, Zhao talk) • Two senior physicist, A. Rozanov and E. Monnier visited IHEP and USTC with focus on Silicon Detector R&D cooperation program.

21. Prospect in 2010 • Continue strong involvement in 7TeV data analysis: performance and early physics analyses. • On going Co-PhD will continue their work in this framework in both institutes involved. • Several Senior Physicists visit already planned (L. Shan (IHEP), C. Zhu (SDU) …) • Several Student visits already planned (CPPM, LPNHE…) • CSC Co-PhD (CPPM/SDU) grant deposited to strengthen CPPM/SDU cooperation (Hope to get it) • CSC Cai Yuanpei grant proposal deposited to sustain cooperation • Strengthen SLHC Silicon Detector R&D cooperation program between ACC and CPPM • Senior Physicist visits planned with possible students accompanying. • Senior + Student together very important for strong cooperation • CSC Cai Yuanpei grant proposal deposited to foster cooperation

22. Summary • Strong and mature France China cooperation on the ATLAS scientific program with recognize visibility within ATLAS • Sustain and strengthen the effort on Students as well as Senior physicists exchanges now that we have data to analyze. • Scientific results are about to come already this year from 7TeV collision data analysis, time to harvest ! • SLHC Silicon detector R&D program is growing up within the ATLAS community • Strengthen SLHC Silicon Detector R&D cooperation program between ACC and CPPM • Time to build up the R&D cooperation program for the future

23. 谢谢！ Merci ! Thank You ! Also Marseille !

24. Backup Slides

25. Hadronic Tile Calorimeter Flat iron absorbers Scintillator tiles 9800 Ch. ; 98.0% Op. Hadronic Tile Calorimeter |η| < 1.7, 3 layers σE/E (jet) ~50%/√E3% EM LAr Calorimeter Accordion lead absorbers Liquid Argon (LAr) 170k Ch. ; 98.6% Op. EM LAr Calorimeter |η| < 3.2 Presampler (|η| < 1.8) + 3 layers, (2 for 2.5<|η|<3.2) σE/E (e/γ) ~(10-15)%/√E0.7% Hadronic LAr Calorimeter Flat copper absorbers + LAr 5600 ch. ; 99,9% Op. 1.5< |η| < 3.2, 4 layers σE/E (jet) ~50%/√E3% Forward LAr Calorimeter LAr/Cu + LAr/W 3500 Ch. ; 100% Op. 3.1 < |η| < 4.9 1 EM + 2 HAD layers σE/E (jet) ~100%/√E10% Calorimeter system Calorimeter L1 trigger 1GeV bit steps, tight noise suppression L1 EM resolution < 5% at high energy The ATLAS Experiment at the CERN Large Hadron Collider,The ATLAS Collaboration, G. Aad et al., JINST 3 (2008) S08003

26. Electron & Photon Kinematics 107 Non Diff. MinBias MC Normalized to: 384k Collision Candidates 1694 Photon candidates: ET>2.5 GeV |η|<2.37 71% γ from π0 14% γ from η, η’, ω 14% hadrons 0.7% prompt γ (ISR/FSR) Sliding window clustering 1.37<|η|<1.52 excluded 879 Electron candidates: ET>2.5 GeV |η|<2.47 Matched track PT>0.5GeV 66% Background fake 33% e from “conversion” (in 3% dalitz, <1% prompt)

27. Shower shape for Photon identification (Similar for electron) Fraction of energy In Front layer Lateral Width In Middle layer Good description of shower in depth and laterally Width for 3 strips Around Max strip In Front layer