ATLAS FCPPL Project ACCIN 2 P 3CPPM LAL

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ATLAS FCPPL Project ACC/IN 2 P 3(CPPM, LAL, LPNHE) Emmanuel MONNIER CPPM 2/21/2021 FCPPL

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

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

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

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

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

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)

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 &

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 &

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

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 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

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

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

Physics is now at our door ! 2/21/2021 16

p. T(e+) = 34 Ge. V, ETMiss = 26 Ge. V, MT = 57

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 =

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

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

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

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

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

�� ! Merci ! Thank You ! Also Marseille ! 2/21/2021 23

Backup Slides 2/21/2021 24

Backup Slides 2/21/2021 24

Calorimeter system Hadronic Tile Calorimeter |η| < 1. 7, 3 layers σE/E (jet) ~50%/√E

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 &

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

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