Crepe-Renaudin, S.

Hal - Université Grenoble Alpes

The start of Tevatron and D0 at Run II

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The start of Tevatron and D0 at Run IIS. Crepe-RenaudinTo cite this version:S. Crepe-Renaudin. The start of Tevatron and D0 at Run II. Greco M. Les Rencontres dePhysique de la Vallee d’Aoste 16, Mar 2002, La Thuile, Italy. Infn Frascati, 1-27 transparents,2002. <in2p3-00020469>HAL Id: in2p3-00020469http://hal.in2p3.fr/in2p3-00020469Submitted on 3 Mar 2004HAL is a multi-disciplinary open accessarchive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come fromteaching and research institutions in France orabroad, or from public or private research centers.L’archive ouverte pluridisciplinaire HAL, estdestine´e au de´poˆt et a` la diffusion de documentsscientifiques de niveau recherche, publie´s ou non,e´manant des e´tablissements d’enseignement et derecherche franc¸ais ou e´trangers, des laboratoirespublics ou prive´s.1Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        The Start of Tevatron and DØ in Run 2o Run 2 : introductiono Tevatrono Statuso Luminosityo DØ detector o Statuso Performanceo First physics resultsSabine Crépé-RenaudinISN GrenobleOn behalf of the DØ collaboration2Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Run 2Tevatron upgrade:o Increased energyo Ös = 1.96 TeV (Run 1: 1.8 TeV)o Increased luminosityo Run 2a: L ˜ 1x1032 cm-2s-1, ?Ldt ˜ 2 fb-1o Run 2b: L ˜ 5x1032 cm-2s-1, ?Ldt ˜ 15 fb-1Detector upgrade:o Necessary adaptation to luminosity upgrade (electronics, trigger, DAQ)o New tracking system + 2T solenoido Add preshower to existing calorimetryo New muon system3Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Run 2 physics- Standard Modelo Top quark propertieso W/Z propertieso B physicso QCD- Higgs- Physics beyond the Standard Modelo Supersymmetryo Technicoloro Extra dimensionso …4Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Tevatron DØCDF5Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Tevatron upgradeProtonso Main injector replaces main ringAntiprotonso Target upgrades, Li lens  o debuncher and accumulator stochastic cooling systemso Run 2b -> use Recycler: antiproton intensity improvementTevatrono Energy increaseo Beam intensity increase / emmittance decrease6Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Tevatron parametersmm mrad20p/15p20p/15p23p/13pp/p emittancemrad13600crossing angle4.82.32.5interactions/xing140x10336x366x6bunchesns132396˜3500bunch spacingTeV1.961.961.8Öspb-1/week10517.33.2?Ldt1031cm-2s-1528.60.16typical Lcm373760bunch length1010103.05.5pbar/bunch10112.72.72.3p/bunchRun 2bRun 2aRun 1b7Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        LuminosityForseen luminosity for 2002Luminosity to date050100150200250300350Jan/1 Feb/27 Apr/26 Jun/23 Aug/20 Oct/17 Dec/142002 Integrated LuminositydateTevatron8Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        The DØ Collaborationq 18 countriesq 81 institutions or universitiesq 500-600 physicists9Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        DØ UpgradeRun 2Run 110Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        DØ detectorDØ detector in the Collision Hall, January 200111Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        CalorimetersLiquid argon sampling and Uranium absorber (Cu or Steel for coarse hadronic)o |?| < 1 (central) o 1.2 < |?| < 4.2 (forward)Readout segmented into h, f for charge detectiono Transverse segmentation  ? ?x? f = 0.1x0.1o At shower max. : ? ? x ? f = 0.05 x 0.05o 55 000 channelsStatuso Fully operational (~0.1% bad channel), calibrated: gain and non linearity corrected  Performanceso e: s(E)/E = 23%/ÖE Å 20%/E Å 0.004o Compensating e/p ~ 1New readoutPreamp/DriverTrig. sumFilter/Shaperx1x8SCA (48 deep)SCA (48 deep)SCA (48 deep)SCA (48 deep)BLS SCACalorimeterCalibrationOutputBufferDetector12Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Preshowers and ICDPreshowerso Central mounted on solenoid (|h| < 1.2) o Forward on calorimeter endcaps (1.4 <|h|<2.5) o Extruded triangular scintillator strips with embedded fibers and Pb absorber (3 or 4 layers)o Allow to trigger on low-pT EM showers and reduce overall electron trigger rate by x3-5o Central preshower: 80% axial readouto Forward preshower not readout for the momentICD (Inter Cryostat Detector)o scintillator tileso Improve coverage for the region  1.1<|h|<1.4o Improves jet ET and METICDFPS13Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to W/Z/top physicsZ ® e+e-Di-EM mass spectrum after energy corrections.Central Calorimeter, onlyMee=93.2 GeVEach e have calorimeter energy and Global track14Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to W/top physicsW® enEventsMT (GeV/c2)MT (GeV/c2)EventsSignalbackgroundWithout matching of track and caloclusterPurity ~ 35 % (~650 signal events)With matching of track and caloclusterPurity ~ 95 % (~200 signal events) E/p for W® en events15Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to QCD physics2-jet event• ETjet1 ~ 230GeV• ETjet2 ~ 190GeVSingle Jet PT3-jet event• ETjet1 ~ 310 GeV• ETjet2 ~ 240 GeV• ETjet3 ~ 110 GeV• ETmis ~    8 GeVPlots obtained with < 1 pb-1 (not normalized with L).No trigger efficiency correction applied.Preliminary energy corrections.Dijet Invariant Mass16Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        TrackingDØ tracking upgrade:o Solenoid: 2 To CFT = Central Fiber Trackero SMT = Silicon Microstrip Tracker17Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        1.2 mp`pSilicon Microstrip TrackerDetector: o Barrel : 6 modules of 4 layers (double/single sided)o 12 central disks (double sided)o 4 forward disks (single sided)o 793 000 channels of electronicso |?| = 3,  2.5 cm < r < 9.5 cmo rad hard -> 1 MradStatuso Fully operationalPerformanceo Point resolution to 10mm svertex= 40 mm (r-f) ; 100 mm (r-z)o secondary vertex measurement -> b jets18Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to B physics … Ks ®p+p-Method:o Select primary verticeso Find all 2 tracks combinationso Select Ks secondary vertices(SMT only tracking)? ®p+p-Displaced vertices19Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Central Fiber TrackerDetectoro |?| = 1.7, 20 = r = 50cmo Eight layers ribbon doublets (axial, stereo 2o), 2.6m active lengtho 74 000  830 mm fibers with Visible Light Photon Counters (VLPC) readout (6-13 K)o Rad hard (10 years @ 1032)Performanceo z information from small angle stereoo fast r-f information for L1 triggero Position resolution ~ 100 µmStatuso 100% axial readout installed,o 50 % for stereo20Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        Muon detectorShieldingForward TrackingDetectors (MDT)Barrel ScintillatorWide Angle Muon PDt’sForward TriggerDetectorsDetectorsWide Angle Muon Proportional Drift Tubes (PDT)o use existing PDT’s for |h| < 1 and faster gas (Ar-CF4-CH4) o add bottom layer to complete coverageForward Tracking Chamberso Plastic mini-drift tubes provide hit info in 1< h < 2 (3 layers)Barrel Scintillatorso time info and match m tracks to fiber trackerForward Trigger Detectorso Scintillator pixel counters (3 layers)Status: fully operational21Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to B physicsJ/yà m+m-Zà m+m-Invariant Mass = 103GeVSelection: pT(m) > 3 GeVN(J/y ) = 865 +/- 10% (bgd uncertainty)M = 3.08 +/- 0.04 GeVs =  0.78 +/- 0.08 GeV22Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to B physicsm in jetsCross Section PT rel distribution23Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to new phenomena physicsMET = 34.3 GeV; M(diEM) = 53 GeVEM2EM1ET = 26.0 GeVh = 1.54j = 5.86No track matchET = 27.4 GeVh = 0.52j = 3.78Loose match with a low-pT trackdiEM+MET ChannelWith 1 track matching24Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        DÆ Run 2 PreliminaryEM1EM2j1j2On the way to new phenomena physicsFirst generation LQ(2 electrons + 2 jets) Kinematic cuts: 2 EM objects with ET > 25 GeV and  more than 2 jets with ET > 20 GeVST = scalar sum of transverse energies of electrons and jets to separate signal and backgroundMost energetic event has ST = 315 GeV5 candidate events,one with a track match6pb-125Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to new phenomena physicsSearch for Extra Dimensions Search for extra spatial dimensions via virtual graviton effects.Variables: center of mass scattering angle and diEM mass (gg and ee).Kinematic cuts: ET(EM) > 25 GeVBackground dominated by Drell-Yan and direct photon productionSM QCDfakesData Signal (MS = 1 TeV, n=4)OverflowSignalregion26Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        On the way to new phenomena physicsme1e2e3 = 85.2 GeV/c2 MET =10.9 GeVme2e3 = 63.5me1e3 = 10.8me1e2 = 55.7e3e2e1pT (cal) = 13.2pT (CFT) = 15.1h = 1.06j = 5.72charge = -1pT (cal) = 13.9pT (SMT) = 10.9h = -1.94j = 2.8charge = +1pT(cal) = 17.9pT(CFT) = 0.52h = 0.43j = 5.42charge = +1MET =31.8 GeVm m m = 41.5 GeV/c2m2m1epT = 9.82h = -1.48j = 2.88charge = 1pT = 28.2h = -0.10j = 6.20charge = -1pT(cal) = 19.2h = 0.40j = 0.63eee canditate event METeµµ candidate event RpV ? couplingTrilepton search27Sabine Crépé-Renaudin - ISN Grenoble                                               La Thuile - March, 2002        OutlookTevatron:o Run 2 started in March 2001o 20 pb-1 delivered today, 300 pb-1 expected at the end of the year.DØ Detectors:o Roll in: January 2001o Commissioning and calibration o Ready to do physics !Physics Results:o First Z, W, Ks, J/? … already thereo First results are really promisingo DØ is looking forward seeing soon: more top, W, Z, QCD and B physics, and why not Susy or Higgs events ?!?!

The start of Tevatron and D0 at Run II

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