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ATLAS Pisa report

ATLAS Pisa report. Experiment status Pisa responsabilities Activities: Commissioning, calibration, physics analysis Requests. Barrel installation completed on 10/12/2005. 10 Dec 2004. Commissioning is being done by all Institutes: F/E electronics, bus, HV, LV etc.

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ATLAS Pisa report

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  1. ATLAS Pisa report Experiment status Pisa responsabilities Activities: Commissioning, calibration, physics analysis Requests C.Roda for the Pisa ATLAS group

  2. Barrel installation completed on 10/12/2005 10 Dec 2004 Commissioning is being done by all Institutes: F/E electronics, bus, HV, LV etc. Move to z=0 +final alignment based on survey data for tiles+LAR ~25 Aug. 05. C.Roda for the Pisa ATLAS group

  3. Present status of the pit C.Roda for the Pisa ATLAS group

  4. F/E electronics tests with Mobidick September 2004 Concerns last certification tests of the individual FE Drawers, before Commissioning (using the local portable Test Bench MobiDICK). All elements are tested, including cooling circuitry + fibers (with pulse LED) All drawers installed in the Barrel, few channels still to be fixed. C.Roda for the Pisa ATLAS group

  5. Row 16 Row 19 TTC & GLINK fibers 1 2 3 MobiDAQ CANbus patch panel F/E electronics tests with MobiDAQ MOBIDAQ in USA15 Use MOBIDAQ: -on truck + temporary cables -At Z=0 with final cables USA15 Tests of the complete system on 8 modules at time: Drawers, buses, CIS, Laser, HV, LV... Use of the online Monitor for immediate diagnostic and offline analysis MobiDAQ is also used for preliminary Cosmic Runs. C.Roda for the Pisa ATLAS group

  6. Fingers and drawers C.Roda for the Pisa ATLAS group

  7. Fix a drawer C.Roda for the Pisa ATLAS group

  8. MobiDAQ Trigger boards TTC modules ADC for the trigger Signals from 8 drawers (4 modules) from S-links for the digital readout TTC signal splitter C.Roda for the Pisa ATLAS group

  9. MobyDAQ: sample of results Pedestal rms (noise) An electronic noise lower than that obtained at the TB has been reached. CIS scan (gain) C.Roda for the Pisa ATLAS group

  10. Cosmic Ray Tests on Preassembled Extended barrel at 185 Use MobiDAQ and temporary trigger logic, Online Monitoring + simple offline analysis Special 9U VME, FPGA programmable 6 Super Drawer/unit Tile Barrel lower modules C.Roda for the Pisa ATLAS group

  11. Cosmics: first results Allows: -Check for dead-channels -HV-Cesium equalization - Compare with Tbeam data ATLANTIS GeoModel Rates in UX15: 130 m/h (TileCal) C.Roda for the Pisa ATLAS group

  12. Cosmics Runs, Energy (pC) for the B-Cells (Check dead channels) C.Roda for the Pisa ATLAS group

  13. Cosmic Ray Tests in the Pit – 22.6.2005 C.Roda for the Pisa ATLAS group

  14. Overall commissioning scenario • Main steps for barrel: • until end Aug: Installation and commissioning WPs standalone in USA15/UX15 • 7-29 September: cables/fibers/pipes installation to the fingers rotating in sectors every 2 days (8 fingers/day) with several teams (TC contractor, Protvino, CF, LIP, tile techs pool+…) with MOBIDAQ. • 9 Sept->16 November :install LV, commissiong 8 fingers at the time rotating in sectors every 6 days (2.7 fingers/day) with MOBIDAQ, ROD DAQ (if available) and MOBIDICK when needed. • 16 Nov-7 Dec: commission the 2 barrel partitions (~5000 channels) with ROD DAQ • The EBC and EBA will follow during end 2005, first half of 2006 C.Roda for the Pisa ATLAS group

  15. Organization We have started a reorganization of TileCal defining things to be done (Work Packages) and responsabilities, hopefully to improve on the efficiency. This process has now converged. In this scheme Pisa is well represented at all levels. C.Roda for the Pisa ATLAS group

  16. TileCal Organization (1) C.Roda for the Pisa ATLAS group

  17. TileCal Organization (2) C.Roda for the Pisa ATLAS group

  18. TileCal Organization (3) C.Roda for the Pisa ATLAS group

  19. TileCal Organization (4) C.Roda for the Pisa ATLAS group

  20. Activities in Pisa Laboratory tests (PMT) Simulation Analysis C.Roda for the Pisa ATLAS group

  21. Tests in Pisa: PMT long run tests (G. Usai) Test of stability of PMT operating in LHC environement for 1-2 years at full luminosity. We badly need air conditioning system to have a stable and reliable system C.Roda for the Pisa ATLAS group

  22. Tests on fibre aging Continuazione dei tests su fenomeni di invecchiamento di fibre curvate (come quelle di Tile). L’idea e` di monitorare con lo stesso PMT una fibra curva ed una dritta eccitate da una stessa sorgente (laser-fotodiode + pulse driver) . Vogliamo usare una DAQ board che abbia una interfaccia a ROOT e scrivere un sistema di acquisizione in ROOT. Chiediamo finanziamenti per assembleare questo sistema di test. C.Roda for the Pisa ATLAS group

  23. Sample of results being obtained One measurement lasts 12 h light is setting: Qpmt = 50 mC Increase light to MB (about 10 times more) at LHC Stability (Am) Time I-dark Gain • We are still debugging. • Most of the problem solved. • Am source is “old” • Poor room temp. conditioning • Some channels shows jumps in gain due to the divider. We are investigating if the source of this problem is the one already found or if it is new one … Quantum eff. C.Roda for the Pisa ATLAS group

  24. Other ongoing activities: • On Line Monitor (Chiara, Andrea, Paolo); Chiara Roda coordinates the effort of a group of physicists from various subdetectors. The work started as an OnLine monitor for TileCal TB, evolved as “GNAM” at the CTB and now looks as a promising approach to a “low level” monitor for many sub detectors for ATLAS. GNAM is now a package of the standard TDAQ software. We are now participating to the monitor working group of ATLAS. • monitor snapshot • TileMuId (G. Usai); the work continues in collaboration with muon community. The method of tagging muons with TileCal is a standard and well debugged tool in Athena and HLT and is evolving as a method for • Isolation of muons in the calorimeters • Recovery of muons large energy losses • Comparison G4/CTB(Andrea, Anna) has made large progresses and should be near to the end. • “Real Detector Simulation” in G4 (Anna) C.Roda for the Pisa ATLAS group

  25. Comparison CombinedTB - Geant4 (A. Dotti) pions in LArg+Tile During spring/summer 2005 we acquired data with a slice of ATLAS These data are now being used for many analysis i.e. tuning of G4 simulation. C.Roda for the Pisa ATLAS group

  26. Comparison CombinedTB - Geant4 (A. Dotti) pions in LArg+Tile • Pions at h = 0.35, Ebeam =20 - 350 GeV • Data calibrated at e.m. scale • Tested methods of energy reconstruction in LArg (still to be refined …) • Fixed few little bugs (now in Athena version 10.0.2) • Now agreement in mean energy deposit is within 3% (Ebeam = 20 - 350 GeV). • Works on resolution and shower shape still going on. C.Roda for the Pisa ATLAS group

  27. Energy distribution Ebeam = 180 GeV 180 GeV h=0.35 Entries (A.U.) LArg E (MeV) Entries (A.U.) TileCal E (MeV) LArg + TileCal Entries (A.U.) C.Roda for the Pisa ATLAS group E (MeV)

  28. Mean reconstructed energy 3% C.Roda for the Pisa ATLAS group

  29. Using weighting techniques on CTB data (Chiara, Iacopo, Andrea) The energy of cell i is weighted: 20 Gev 50 Gev a, b are obtained by minimizing: 100 Gev 200 Gev Linearity Resolution Raw Corrected C.Roda for the Pisa ATLAS group

  30. This activity comes along with the Jet Energy reconstruction/calibration (Chiara, Iacopo). Calibration of DC1 dijet (QCD) sample has been done, in progress the work on the “Rome-layout” production. Few methods of jets reconstruction (cone, kt, topojet) and then recalibration. Results of our method: linearity +-2% (0.02-4 TeV) resolution improves by 15% The package is now one of the standard method in Athena. Chiara is becoming the convener of the jet reconstruction and calibration for ATLAS group C.Roda for the Pisa ATLAS group

  31. Physics analysis. • Two analyis to check the possible use of a LVL2 “b-tagger” (FASTRACK a la CDF or battery of CPUs). • pp->j+Z+X with Z->bb(b-tagged jets); if possible to trigger on this channel it would be the ideal way of calibrating the b-jets. • pp->bb+A/H with A/H->bb(3/4 b-tagged Jets); this is a standard discovery channel of the supersymmetric Higgs. • In both studies the b is assumed to decay hadronically and be identified by impact parameter. • The advantage is the BR, the disadvantage is the tag efficiency, mistags. • pp->Hqq +X with H->tt C.Roda for the Pisa ATLAS group

  32. Jet+Z->bb (V. Cavasinni and I. Vivarelli) Needs to lower the jet thresholds to have sidebands for bknd subtraction, hence reduce the rates at LVL2 by fast tagging b-quarks. C.Roda for the Pisa ATLAS group

  33. pp-> bb+A/H->4b (3/4 tagged) (V. Cavasinni and I. Vivarelli) The proposed trigger allows to have a factor 10 more statistics. To avoid too large QCD rate it needs fast b-tagging. It is a counting experiment where the new scheme of triggering can improve the significance over the standard trigger menu. C.Roda for the Pisa ATLAS group

  34. ATLAS light HIGGS discovery potential at 30 fb-1 • Vector boson fusion qqHtt • (at least one t decaying leptonically) • fundamental at masses 120-140 GeV. C.Roda for the Pisa ATLAS group

  35. HVBF tt hhnn(F.Sarri, V. Cavasinni, I.Vivarelli) In this channel, comparing to the one with at least one tau leptonic decay, we have an additional huge background from QCD: The algorithm to identify ’s and reject QCD jets is the fundamental ingredient. Use the results of the Milano,Freiburg groups: D. Cavalli, M. Heldmann C.Roda for the Pisa ATLAS group

  36. Example of analysis cuts: Hard cuts • at least 4 jets; • 2 tagged tau jets with pt over 45 and 35 GeV; • missing transverse energy over 45 GeV; • 2 forward candidates with pt above 60 and 40 GeV; • negative product of forward jet eta and Dh > 4; • taus between 2 forward ; • 0 < x1(2) < 1 and taus not back to back (Df < 3); • forward jet invariant mass > 700 GeV; • no jet with pt > 30 GeV between the forwards, apart from the taus; • cut on mass window : 104 GeV < mtt < 150 GeV. Studies are carried out on fast detector simulation however the tau tagging has been deeply studied on full simulation and on real data from D0. C.Roda for the Pisa ATLAS group

  37. HVBF  tt hhnn: signal + QCD background preliminary “Hard” cuts 30 fb-1 300 fb-1 C.Roda for the Pisa ATLAS group

  38. HVBF  tt hhnn: signal vs QCD background preliminary “Soft” cuts: essentially lower pt thresholds C.Roda for the Pisa ATLAS group

  39. ttbar background Both Ws dacay in tn : ~ 1% On ttbar events the rejection from parameterization is worse by about a factor 2. Contribution of this background in the mass window (104 – 150 GeV) is negligible. C.Roda for the Pisa ATLAS group

  40. g*/Z +jets background Important background g*/Z + jets with g*/Z  tt has a s = 1742 pb: 736 pb with two true hadronic taus. UNDER STUDY C.Roda for the Pisa ATLAS group

  41. Composizione del gruppo 2006 Paolo Adragna (Dott) 100. Vincenzo Cavasinni (PO) 80. Tarcisio Del Prete (INFN) 100. Andrea Dotti (Dott) 100. Vincenzo Flaminio (PO) 20. Danilo Giulietti (PA) 20. Francesca Sarri (Dott) 100. Anna Lupi (Ass) 100. Chiara Roda (RU) 80. Giulio Usai (Ass) 100. Iacopo Vivarelli (Ass) 100. FE 9.0 Neolaureati 1 livello: Paolo Francavilla Laureandi : Maria Canneri, Paolo Francavilla C.Roda for the Pisa ATLAS group

  42. Preventivi 2006 • Missioni Interne …… 1.5  9 FE = 15 k€ • Consumo .................................. 15 k€ • MOF 49 KchF • CI 72 KchF • CC 0 KchF • Materiale Inventariabile .......… 34 k€ • Implementazione DAQ&sistema di test fibre: • DAQ board 10 K€ • Crate VME 7 K€ • Driver Pulse + LaserFotoDiode 6 K€ • Aggiornamento farm (Tier3): • 5kSI2k CPU 6 K€ • dischi per 2TB 5 K€ • Missioni Estere 1.5 x 9 mu = 13.5 mu • 4 coordinamenti 4 mu • responsabilita’ commissioning 12 mu • tecnici assemblaggio 7 mu Totale ME: 30 + 7 mu Richieste alla sezione : 7 m.u.7 mesi uomo tecnici al CERN per Commissioning al pit di Tile Cal all’inizio del 2006. C.Roda for the Pisa ATLAS group

  43. Energy in a cone around a tagged muon (G. Usai) Cone radius Back C.Roda for the Pisa ATLAS group

  44. Mean value for CIS signal as PMT function • Distribution (48 PMTs) of mean value for CIS signal • Distribution (48 PMTs) of rms for CIS signal • Signal Timing as PMT function (no corrections applied) 1 3 4 2 Back C.Roda for the Pisa ATLAS group Back

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