Status of Eric Kajfasz CPPM/Fermilab GDR-Susy, Lyon - 26 novembre 2001

The D0 detector

Short history of RunII so far... Continue data taking~ November 26 Start 7 week shutdown. DØ: install fiber tracker electronics ( main effort) October 8 Accumulate luminosity; complete detector; time in; improve electronics, DAQ and offline systems Take data with intermittent shutdowns First collisions in TevatronApril 3 Close complex; ready for beam; Run 2 officially starts March 1 Roll DØ detector into collision hallJanuary 26 ActionDates in 2001 Run 2, the big picture: 2a: a multi year run with integrated lum goal  fb -1 replace silicon detector 2b: a multi year run with integrated lum goal  fb -1 Shutdown ~ 2004

L0 Trigger and Luminosity Monitor Delivered: 9.5 pb -1 Exposed: 6.8pb -1 ; use for all data taking ( commissioning; tests + physics) Global: 3.5pb -1 for global physics runs Level 0 trigger & luminosity counters August 1  Oct 7:

Silicon Tracker real life 6 barrels 12 F disks 4 H disks 800K channels; completed hook up by May 2001  85% live channels After November shutdown  About 95% live channels Results from SMT tracking only: measure interaction vertex X vs. Y X, Y vs. Z  Moved detector by 4 (X) and 5mm (Y)

Silicon Tracker Noise ~ 1 to 2 countsCluster charge: ~25 counts/MIP

Silicon Tracker

Silicon Tracker - b tagging  Plot impact parameter significance for these tracks First hint of an impact parameter signal from B’s Very encouraging! IP signif.

Central Fiber Tracker 94 boards installed (74 axial/12 stereo) 8 layers of axial and stereo 800um fibers

SMT - CFT alignment

Calorimeter: Electronics Upgrade  55k channel Ur/liq. Argon calorimeter  Run II upgrade: replacement of electronics to accommodate faster bunch crossings  55k dual FET PreAmps  23k Switch Capacitor Arrays (SCA) on 1200 BaseLineSubtraction (BLS)-boards ~ 50 bad channels (~0.1%) Preamp/ Driver Trig. sum Filter/ Shaper x1 x8 SCA (48 deep) BLS Output Buffer Bank 0 Bank 1 SCA Calorimeter Calibration electronics readout chain

Calorimeter Performances SCA-behavior: pedestal measurement over all channels of 1 chip – spread ~1ADC count ADC counts late/ nom. early/ nom.  =0.77  =0.69 Timing Studies: using triple sampling runs all crates timed in at ~10ns Energy Scale: estimation from electronic calibration absolute scale verified at 10% pulser shaper output pulser ADC- readout L1 SCA up L1 SCA down L2 SCA

Calorimeter: W/Z events Z  ee candidate 2 EM objects, E T > 20 GeV, isolation and shower shape cuts EM cluster with track W  e candidate m T (e, ) L ~0.7pb -1 m(e,e) L ~0.7pb - 1 DØ MZMZ invariant mass (GeV) transverse mass (GeV) DØ un-calibrated energies

Calorimeter: jet events 2-jet event E T jet1 ~230 GeV, E T jet2 ~190GeV Jet p T Distribution  -jet event E T  =27 GeV em-fraction 0.9 E t jet =24GeV em-fraction 0.5 R un I- jet corrections 0.7 cone DØ

Muon System

Inter Cryostat Detector multiple improvements during shutdown all tiles/phototubes installed ready for data taking

Forward Proton Detector Installation in the tunnel and in the hall progressing well Continue commissioning

Trigger and DAQ Completion date Status Dec 1Status Oct 8System 1kHz in ~March 2002 In: 500Hz Cal & Muon filters; others starting In: 80 Hz Use emulators; final hardware not ready; CAL filters In:~1 khz L3/DAQ Out:50 Hz Feb 2002 Cal & Muon working 0% due to a processor problems In:5-10kHz L2 Out:~1kHz Dec 2001 CAL: 100% Muon: 100% Track: 100% CAL: 50% Muon: 50% Track: 0% In: 2.5Mhz L1 Out:5-10kHz

L3 calorimeter trigger EM clusters, p T > 10 GeV Isolated, EM fraction > 0.9 |  | < 1.1 Jets, p T > 15 GeV R = 0.7 cone |  | < 1.1

Outlook lPre-shutdown data analysis proves efficient operation of most detector sub-systems, including hardware and software lShutdown jobs were successful and accomplished on schedule lAFE installation will continue during next 2 months in parallel with Fiber Tracker and Fiber Trigger commissioning lStarting post-shutdown operations with few dead channels in most systems, a new Linux L3 farm and improved DAQ system

Outlook lHave a well defined list of goals for operation during December-January to be ready for Spring Conferences oConcentrate on global physics data taking oReasonably minimize amount of special runs lTevatron plan is to provide colliding beams starting late November oNo major shutdown planned until next summer oWill start from the same luminosity as before the shutdown oRamp luminosity to 1-2x10 31 in January o~ 1 day of studies per week oLonger term plan is to get luminosity of 5-10x10 31 by next summer oExpect 400 pb -1 by the end of 2002

Part of the future: Silicon for RunIIb