ATLAS FCPPL Project ACCIN 2 P 3CPPM LAL
- Slides: 27
ATLAS FCPPL Project ACC/IN 2 P 3(CPPM, LAL, LPNHE) Emmanuel MONNIER CPPM 2/21/2021 FCPPL 3 rd workshop IPN Lyon 8 April 2010 1
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η=-ln(tan(Θ/2)) 2/21/2021 3
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ACC(IHEP/SDU/USTC/NJU)-IN 2 P 3(CPPM/LAL/LPNHE) Very strong cooperation program between the Atlas Chinese Cluster and CPPM, LAL and LPNHE since several years: l Higgs studies (through γ γ or WW final states) (see Yuan Li talk) l Higgs and Susy searches (through ttbar, leptons and jets final states) (see Lu Feng talk) l Di-boson studies (see Liu Yanwen talk) l Top properties (see Shan Lian. You talk) l Performance studies (E/gamma - Jet/Missing Et – B tag – Trigger) (see below and in following talks) l Work for Higgs production cross section Atlas note (H. Zhang/S. Muanza) l Silicon detector R&D (see Zhao Lei talk) l Numerous presentation in Atlas meetings as well as in internal, public/conf notes and publications. l 2/21/2021 5
ACC(IHEP/SDU/USTC/NJU)-IN 2 P 3(CPPM/LAL/LPNHE) l 2009/2010: first collision data (0. 9, 2. 36 then 7 Te. V) LHC at 7 Te. V for the next 2 years and 1 fb-1 expected l Shift in physics expectation and focus on data analysis Performance studies: E/gamma, Jet/Missing Et, B tag, μ, Trigger… l l then W, Z, top, di bosons, SUSY, Higgs… 2/21/2021 6
Timing Nov 23 rd run Tile 2/21/2021 Relative timing to ~1 ns with splash events: early collision data selection 7
Beam Splash Event Analysis (1) X. F. Ruan (joint Ph. D 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 (ar. Xiv: 1002. 4189 v 1 [physics. ins-det]) Comparison: Both based on pulses with 32 samples Splash Events Cosmic Muons Analyzed pulses ~ 4 106 ~ 473 k Particle orientation Horizontal Mostly vertical 2/21/2021 8
Example Results: Gap uniformity (shift): excellent agreement Shift (mm) Beam Splash Event Analysis (2) Atlas work in progress Middle layer Splash Drift time (ns) Cosmic Atlas work in progress Cosmic Splash 2/21/2021 Back layer Drift time: Some difference observed & under investigation 9
L 1 Calo Trigger L 1 Calo system has expected behavior Separate trigger & readout processing High Et Resolution < 5% designed 1 Ge. V bit steps Tight noise suppression (2009) (also Jet: 0. 4 x 0. 4, η x φ) 2/21/2021 Lowest EM: 0. 1 x 0. 1, η x φ 10
SV 0 b tag studies Bai Yu (joint Ph. D student of CPPM & IHEP), L. Feligioni, L. Shan, L. Vacavant l Decay Length Significance: Performance studies l Correlation between Btag estimator studies l Miss-tag rate estimate from data l l l Jet Direction Tracks Secondary Vertex Discrimination Power: l Heavy Flavor Jet: tend to be positive l Light Flavor Jet: presence of a secondary vertex (resolution effect of light jet) Primary Vertex In parallel, tracking DPD maker validation (on data) 2/21/2021 11
RSV <50 mm cut on performance improvement Atlas work in progress 2/21/2021 12
SV 0 weakly correlated with other tag variables (light jets) SV 0 Negative Region SV 0 Positive Region Atlas work in progress l Study now focus on collision data as well to study miss-tag rate 2/21/2021 13
γγ invariant mass spectrum ETcluster > 0. 4 Ge. V PTpair > 0. 9 Ge. V f 1>0. 1 Dedicated calibration for low ET photons Data: mπ0 =134. 0± 0. 8 stat Me. V σ = 24. 0 Me. V MC: mπ0 =132. 9± 0. 2 stat Me. V σ = 25. 2 Me. V Nbr π0 = 1. 34± 0. 02 stat X 104 ETcluster > 0. 8 Ge. V PTpair > 2. 2 Ge. V Track veto cluster with matched track Data: mη 0 = 527± 11 stat Me. V MC: mη 0 = 544± 3 stat Me. V Width and position well described 2/21/2021 14
Conversion: π0 mass peak with γ (calo) + γ(→e+e-) Reconstructed tracks with hits in silicon detectors PT γe+e- > 0. 9 Ge. V 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 (1 st SCT layer) p. T (e+) = 1. 75 Ge. V, 11 TRT high-threshold hits p. T 2/21/2021 (e-) = 0. 79 Ge. V, 3 TRT high-threshold hits 15
Physics is now at our door ! 2/21/2021 16
p. T(e+) = 34 Ge. V, ETMiss = 26 Ge. V, MT = 57 Ge. V, ηe+ = -0. 42 2/21/2021 17
2/21/2021 p. T(μ+) = 29 Ge. V, ETMiss = 24 Ge. V, MT = 53 Ge. V, ημ+ = 0. 66 18
2009 ATLAS ACC-IN 2 P 3 cooperation heavily involved in early data analyses l Co-Ph. D : l B. Yu, CAS funded (10 Months ended in 2009)(CPPM/IHEP), l L. Yuan (French Embassy funded)(LPNHE/IHEP), l X. Ruan CAS funded (started 09/09) (LAL/IHEP), l S. Li CSC funded (started 09/09)(CPPM/USTC), l + 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). l 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. l 2/21/2021 19
2009 In parallel: Started a strong SLHC Silicon detector R&D cooperation program between ACC and CPPM: l 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) l Two senior physicist, A. Rozanov and E. Monnier visited IHEP and USTC with focus on Silicon Detector R&D cooperation program. l 2/21/2021 20
Prospect in 2010 Continue strong involvement in 7 Te. V data analysis: performance and early physics analyses. l On going Co-Ph. D will continue their work in this framework in both institutes involved. l Several Senior Physicists visit already planned (L. Shan (IHEP), C. Zhu (SDU) …) l Several Student visits already planned (CPPM, LPNHE…) l CSC Co-Ph. D (CPPM/SDU) grant deposited to strengthen CPPM/SDU cooperation (Hope to get it) l CSC Cai Yuanpei grant proposal deposited to sustain cooperation l Strengthen SLHC Silicon Detector R&D cooperation program between ACC and CPPM l Senior Physicist visits planned with possible students accompanying. l Senior + Student together very important for strong cooperation l CSC Cai Yuanpei grant proposal deposited to foster cooperation l 2/21/2021 21
Summary Strong and mature France China cooperation on the ATLAS scientific program with recognize visibility within ATLAS l Sustain and strengthen the effort on Students as well as Senior physicists exchanges now that we have data to analyze. l Scientific results are about to come already this year from 7 Te. V collision data analysis, time to harvest ! l SLHC Silicon detector R&D program is growing up within the ATLAS community l Strengthen SLHC Silicon Detector R&D cooperation program between ACC and CPPM l l Time to build up the R&D cooperation program for the future 2/21/2021 22
�� ! Merci ! Thank You ! Also Marseille ! 2/21/2021 23
Backup Slides 2/21/2021 24
Calorimeter system Hadronic Tile Calorimeter |η| < 1. 7, 3 layers σE/E (jet) ~50%/√E 3% Hadronic Tile Calorimeter Flat iron absorbers Scintillator tiles 9800 Ch. ; 98. 0% Op. EM LAr Calorimeter Accordion lead absorbers Liquid Argon (LAr) 170 k Ch. ; 98. 6% Op. EM LAr Calorimeter |η| < 3. 2 Presampler (|η| < 1. 8) + 3 layers, (2 for 2. 5<|η|<3. 2) Hadronic LAr Calorimeter Flat copper absorbers + LAr 5600 ch. ; 99, 9% Op. 1. 5< |η| < 3. 2, 4 layers σE/E (e/γ) ~(10 -15)%/√E 0. 7% 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 Calorimeter L 1 trigger 1 Ge. V bit steps, tight noise suppression L 1 EM resolution < 5% at high energy 2/21/2021 The ATLAS σE/E (jet) ~100%/√E 10% Experiment at the CERN Large Hadron Collider, The ATLAS Collaboration, G. Aad et al. , JINST 3 (2008) S 08003 25
107 Non Diff. Min. Bias MC Normalized to: 384 k Collision Candidates Electron & Photon Kinematics 1694 Photon candidates: ET>2. 5 Ge. V |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 Ge. V |η|<2. 47 Matched track PT>0. 5 Ge. V 66% Background fake 33% e from “conversion” (in 3% dalitz, <1% prompt) 2/21/2021 26
Shower shape for Photon identification Fraction of energy In Front layer Lateral Width In Middle layer Width for 3 strips Around Max strip In Front layer 2/21/2021 (Similar for electron) Good description of shower in depth and laterally 27
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