cdf status report n.
Skip this Video
Download Presentation
CDF: Status Report

Loading in 2 Seconds...

play fullscreen
1 / 56

CDF: Status Report - PowerPoint PPT Presentation

  • Uploaded on

CDF. Tevatron. Main Injector. CDF: Status Report. Outline. Franco Bedeschi INFN - Pisa Riunione Gruppo 1 Catania, 18/9/02. Status of the Tevatron Status of the CDF detector First results with Run II data Run IIB upgrades MOF status. Tevatron status. Tevatron operation update

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'CDF: Status Report' - emil

Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
cdf status report



Main Injector

CDF: Status Report


Franco Bedeschi

INFN - Pisa

Riunione Gruppo 1

Catania, 18/9/02

  • Status of the Tevatron
  • Status of the CDF detector
  • First results with Run II data
  • Run IIB upgrades
  • MOF status

F. Bedeschi, INFN-Pisa

tevatron status
Tevatron status
  • Tevatron operation update
    • Luminosity goals for run 2a:
      • 5-8x1031 cm-2sec-1 w/o Recycler
      • 2x1032 cm-2sec-1 with Recycler
    • Achieved:
      • 2.8x1031 cm-2sec-1 in July ’02
      • June shutdown to fix p-bar cooling
      • 54 pb-1 delivered until early June
        • 35 pb-1 are on tape
        • 10 – 20 pb-1used for analyses shown at Summer Conferences
          • February 02 - June 02 period
          • Sample doubled with new data

Slow increase

Integr. Luminosity

54 pb-1


On tape

35 pb-1

F. Bedeschi, INFN-Pisa

tevatron status1
Tevatron status
  • Short term plans:
    • Run until new year
      • Load on Italian group foreign travel increased (shifts, on-call, etc.)
      • Reach goal w/o Recycler:
        • 5-8x1031 cm-2sec-1
    • 1-2 months shutdown
      • Complete Recycler work
    • Commission and integrate Recycler during 2003
      • Mostly in parallel with Tevatron colliding beam operation
  • Expect 100 – 150 pb-1 delivered in 2002 ~ Run 1 data set

F. Bedeschi, INFN-Pisa

tevatron status2
Tevatron Status

*”Achieved” refers to simultaneous performance. Best individual parameters are higher.

F. Bedeschi, INFN-Pisa

injection and acceleration
Injection and acceleration

Shot 1583 showing:

Loading of 36 proton bunches at 150 GeV

Poor lifetime at 150 GeV

Significant beam loss on acceleration

Loading of 9x4 antiproton bunches at 150 GeV


Luminosity potential

3.6E31 if acceleration losses eliminated, >4E31 if lifetime improved.

Beam current



F. Bedeschi, INFN-Pisa

tevatron status3
Tevatron Status

F. Bedeschi, INFN-Pisa

cdf data taking efficiency
CDF data taking efficiency
  • Avg. efficiency in data taking ~80%
    • Goal is > 90%
    • Reached already in several occasions

F. Bedeschi, INFN-Pisa

status of the cdf detector
Status of the CDF Detector

Central calorimeters


Central muon





Front end







Silicon and drift chamber trackers

Forward muon

F. Bedeschi, INFN-Pisa

cdf detector status
CDF Detector Status
  • Detector:
    • All systems installed and commissioned
      • SVX II much improved during June shutdown
      • 10/12 ISL cooling lines cleaned after June shutdown, will finish in January ‘03
  • DAQ and trigger:
    • Running physics trigger table with > 100 trigger paths since February ‘02
      • SVT very successful and improving
      • L2 problems largely solved

F. Bedeschi, INFN-Pisa

detector performance
Detector Performance
  • Trigger:
    • Goal rates for L = 2x1032
      • L1/L2/L3 = 50,000/300/50 Hz
    • Typical now for L ~ 1031
      • L1/L2/L3 = 8,000/250/30 Hz
  • DAQ
    • Logging data at the planned rate of ~ 20 Mbyte/sec
  • Offline:
    • Data is reconstructed in quasi real time on a dedicated production farm
  • We take data at ~ same rate as goal luminosity!
    • Data analysis needs are little affected by low luminosity



F. Bedeschi, INFN-Pisa

detector performance1
Detector Performance
  • Commissioning:
    • L00 > 95%
    • SVXII > 90%
    • ISL > 80%
      • Completing cooling work

June shutdown

ISL almost fixed

% of silicon ladders powered and read-out

* Concern about loss of connection to z-side in special situations. 4 ladders affected recently

F. Bedeschi, INFN-Pisa

detector performance2
Detector Performance
  • Silicon detectors:
    • Typical S/N ~12
    • Alignment in R-f good
      • First reliable R-z iteration in production soon

F. Bedeschi, INFN-Pisa

detector performance3
Detector Performance
  • TOF resolution within 10 –20% of design value
    • Improving calibrations and corrections

S/N = 1942/4517


S/N = 2354/93113

F. Bedeschi, INFN-Pisa

detector performance4
Detector Performance
  • XFT: L1 trigger on tracks
    • full design resolution
      • DpT/p2T = 1.8% (GeV-1)
      • Df = 8 mrad

Efficiency curve:

XFT cut at

PT = 1.5 GeV/c





F. Bedeschi, INFN-Pisa

detector performance5

s=48 mm

Detector Performance





  • Secondary VerTex L2 trigger
    • Online fit of primary Vtx
    • Beam tilt aligned
    • D resolution as planned
      • 48 mm (33 mm beam spot transverse size)
    • 15% efficiency increase after downloading updated associative memory patterns (mostly Italian work)
      • NOT available in analyses that follow

F. Bedeschi, INFN-Pisa

physics with cdf ii
Physics with CDF-II
  • Use data to understand the new detector:
    • energy scales in calorimeter and tracking systems
    • detector calibrations and resolutions
    • tune Monte Carlo to data
  • Use data to do physics analyses
    • Real measurement beyond PR plots
    • Quality of standard signatures
    • Rates of basic physics signals
    • Surprisingly some results are already of relevance in spite of the limited statistics
      • Several CDF presentations made in the parallel sessions
      • In the following brief/incomplete summary of a lot of work

F. Bedeschi, INFN-Pisa

data sample
Data Sample
  • Stable physics trigger table established since February ’02
  • Summary of data used for ICHEP2002:
    • Data period: January – June, 2002
    • Delivered luminosity: 33.0 pb-1
    • Live (to-tape): 23.5 pb-1
    • “Good runs”: 23.3 pb-1
    • “Good runs” with all systems ~ 10.0 pb-1 (cfr. 110 pb-1 Run 1)
      • Radiation induced COT/SVX VME power supply failures (fixed!)
      • Instabilities in Silicon readout (much improved)
  • New data are waiting for update of production code for processing. Will start full reprocessing in October.

F. Bedeschi, INFN-Pisa

em calorimeter scale
EM Calorimeter scale

NZ = 247


  • 638 Z  e+e- in 10 pb-1
    • s(M) ~ 4 GeV
  • Check Z mass in data and simulation after corrections
    • Central region:
      • Mean: +1.2% data, -0.6% sim.
      • Resolution: +2% simulation
    • Forward region (Plug):
      • Mean: +10/6.6% data, +2.0% simulation
      • Resolution: +4% simulation

Central-West plug

Central-East plug

NZ (W+E) = 391

F. Bedeschi, INFN-Pisa

measurements with high et e
Measurements with high Et e±
  • Uncorrected Z e+e- angular distributions and asymmetries

Measurements compared with Pythia/CTEQ5L prediction


Back to index

F. Bedeschi, INFN-Pisa

measurements with high et e1
Measurements with high Et e±
  • Clear evidence for W en signal
    • Isolated central electron
    • Et > 25 GeV, Et >25 GeV

F. Bedeschi, INFN-Pisa

measurements with high et e2
Measurements with high Et e±
  • Good modeling of observed W en distributions

F. Bedeschi, INFN-Pisa

met resolution
MET resolution
  • Minimum bias events
    • Run 1: 0.53/S Et with forward cal. Use |h|<4.2
    • Run II: 0.60/S Et with plug only |h|<3.6
      • With miniplug |h|<5.5

F. Bedeschi, INFN-Pisa

measurements with high et e3
Measurements with high Et e±

0.10 soon!

0.16 now!

  • W cross section:
    • sW*BR(Wen) (nb) = 2.60±0.07stat±0.11syst ±0.26lum
    • Consistent with Run 1 results rescaled for higher energy: 2.72±0.02stat±0.08syst ±0.09lum (use Sterling et al. NNLO predictions)

Nr. Candidates:

- 5547 in 10 pb-1


- QCD: 260 ± 34 ± 78

- Z ee: 54 ± 2 ± 3

- Wtn: 95 ± 6 ± 1

F. Bedeschi, INFN-Pisa

measurements with high et m
Measurements with high Et m±
  • Clear evidence of Z m+m-
    • Signal shown for OS muons detected in both inner and outer muon chambers



  • 57 candidate events in 66<Minv<116 range
  • NZ = 53.2±7.5 ±2.7

F. Bedeschi, INFN-Pisa

measurements with high et m1
Measurements with high Et m±
  • Good modeling of observed Wmn distributions
  • Measure s(Wmn) and R=s(Wmn)/s(Zmm)


beam profile


F. Bedeschi, INFN-Pisa

measurements with high et m2
Measurements with high Et m±
  • W cross section:
    • sW*BR(Wmn) (nb) = 2.70±0.04stat±0.19syst ±0.26lum
    • Consistent with Run 1 results rescaled for higher energy: 2.41±0.08stat±0.15syst ±0.16lum (use Sterling et al. NNLO predictions)

Nr. Candidates:

- 4561 in 16 pb-1


- QCD: 104 ± 53

- Cosmics: 73 ± 30

- Z mm: 247 ± 13

- Wtn: 145 ± 10


  • R=s(Wmn)/s(Zmm)= 13.66±1.94stat±1.12syst
    • Consistent with Run 1 results

F. Bedeschi, INFN-Pisa

w t n
W  t n
  • Evidence for typical t decay multiplicity in W t n selections

Back to index

F. Bedeschi, INFN-Pisa

measurements with low et m
Measurements with low Et m±

13 pb-1

  • y trigger improved
    • pTm > 2.0 1.5GeV
    • Df > 5° 2.5°
  • Observed y rates are consistent with expected increase due the lowering of the thresholds



100k y

Centralmuons only

15 MeV with Silicon

s = 21.6 MeV

F. Bedeschi, INFN-Pisa

measurements with low et m1
Measurements with low Et m±
  • Inclusive B lifetime with y’s
    • Fit pseudo-ct = Lxyy*FMC*My/pTydistribution
      • Output: b lifetime, fraction of y from B
        • ct=458±10 stat. ±11 syst. mm

(PDG: 469±4 mm)

        • y from B = 17% (pTy > 4 GeV)
  • Resolution function from large prompt component
    • R = narrow + wide Gaussian (19%) + exponential tails (1.2%)
    • Scale factor on error returned from vertex fit 1.069

~ 46%



F. Bedeschi, INFN-Pisa

measurements with low et m2

Add B scale correction

Tune missing material ~20%

Correct for material in GEANT

Raw tracks

Measurements with low Et m±


  • Use y’s to understand E-loss and B-field corrections
  • Check with other known signals





F. Bedeschi, INFN-Pisa

measurements with low et m3
Measurements with low Et m±

semi-leptonic B


  • B masses:
    • y(2S)J/y p+p- (control)
    • Bu J/y K+
    • Bd J/y K0* (K0*K+p-)
    • Bs J/y f (fK+K-)


More mass plots


s( PDG)

CDF 2002DPDG/s

y(2S) 3686.43±0.54 0.866.00

Bu 5280.60±1.70±1.1 0.774.05

Bd 5279.80±1.90±1.4 0.174.72

Bs 5360.30±3.80± -1.811.90




F. Bedeschi, INFN-Pisa

measurements with low et m4
Measurements with low Et m±


  • More mass plots:
    • Bd, Bs



Back to index

F. Bedeschi, INFN-Pisa

measurements with low et m5
Measurements with low Et m±

# B+ ~ 154

  • B+ lifetime:
    • B+ J/y K+
    • Fit results:
      • ct=446±43±13 mm

(D PDG/s = 1.2)

      • Res. scale factor 1.16
      • Conservative systematic error


Back to index

F. Bedeschi, INFN-Pisa

measurements with inclusive leptons
Measurements with inclusive leptons


Back to index

  • Find large samples of semileptonic B decays

F. Bedeschi, INFN-Pisa

measurements with jets
Measurements with jets
  • Raw Et only:
    • Jet 1: ET = 403 GeV
    • Jet 2: ET = 322 GeV

F. Bedeschi, INFN-Pisa

measurements with jets1
Measurements with jets
  • Expectations:
    • Increase max. energy reach
    • Study both central and forward
      • New physics is mostly central
      • Pdf’s affect both regions
  • Current work:
    • Accumulate large samples
    • Understand energy corrections
      • E-scale, jet shapes, MC tuning

Central jets

Run 1

Run 2a

Run 2b

Forward jets

F. Bedeschi, INFN-Pisa

measurements with jets2
Measurements with jets
  • Jet distr. from data
    • Raw ET
    • Each trigger

rescaled for

pre-scale factor

Fixed cone algorithm: R = 0.7

F. Bedeschi, INFN-Pisa

hadronic energy scale



Plug region

Plug region

Hadronic Energy Scale
  • Use J/y muons to measure MIP in hadron calorimeters
    • (Run II)/(Run 1) = 0.96±0.005





  • Gamma-jet balancing to study jet response
    • fb = (pTjet – pTg)/pTg
      • Run Ib (central): fb= -0.1980 ± 0.0017
      • Run II (central): fb= -0.2379 ± 0.0028
    • Plug region corrections in progress

D fb = (4.0 ±0.4)%

F. Bedeschi, INFN-Pisa

measurements with jets3
Measurements with jets
  • Jet shapes:
    • Narrower at higher ET
    • Calorimeter and tracking consistent
    • Herwig modeling OK

16 pb-1 used for this study

F. Bedeschi, INFN-Pisa

measurements with hadronic b triggers
Measurements with hadronic b triggers

D0 K p


10 pb-1

  • L2 trigger on 2 tracks:
    • pt > 2 GeV
      • |D| > 100 mm (2 body)
      • |D| > 120 mm (multibody)
  • Swamped by D mesons!
    • But see B’s as well….

CDF Run 2 preliminary

  • Ds± - D± mass difference
    • Both D  fp (fKK)
    • Dm=99.28±0.43±0.27 MeV
      • PDG: 99.2±0.5 MeV
    • Systematics dominated by background modeling





F. Bedeschi, INFN-Pisa

measurements with hadronic b triggers important italian contribution
Measurements with hadronic b triggers(important Italian contribution)
  • Measure ratios of CKM suppressed decays
    • G(DKK)/G(DKp) = (11.17±0.48±0.98)% (PDG: 10.84±0.45)
      • Main systematics (8%): background modeling
    • G(Dpp)/G(DKp) = (3.37±0.20±0.16)% (PDG: 3.76±0.20)
      • Main systematics (4%): relative acceptance

CDF Run 2 preliminary

CDF Run 2 preliminary

L = 10 pb-1

Signal: 5670

Signal: 2020

F. Bedeschi, INFN-Pisa

measurements with hadronic b triggers1
Measurements with hadronic b triggers
  • D mesons:
    • What fraction from B?
      • D0: 16.4-23.1%
      • D*+: 11.4-20.0%
      • D+: 11.3-17.3%
      • Ds+: 34.8-37.8%

Range of fract. from B using two extreme resolutions functions:

-single gaussian

- parametrization from K0S sample



F. Bedeschi, INFN-Pisa

measurements with hadronic b triggers important italian contribution1
Measurements with hadronic b triggers(important Italian contribution)

#B+ = 56±12

  • Hadronic B decays observed
    • Yield lower than expected (silicon coverage/SVT efficiency > x 3)
    • S/N much better than expected
      • Better S/N dilution compensates reduced statistics

#B = 33±9

B  h+ h-

B+ D0p+

F. Bedeschi, INFN-Pisa

conclusions on tevatron and detector status
Conclusions on Tevatron and detector status
  • Tevatron is slowly improving
  • The CDF detector is fully functional and accumulating proton anti-proton data
  • Understanding of detector is advanced
  • Many early physics results
    • sometimes competitive in spite of limited statistics
  • Ready to exploit full Tevatron potential as luminosity increases

F. Bedeschi, INFN-Pisa

run 2b upgrades
Run 2B Upgrades
  • Progetti, motivazioni e richieste complessive degli upgrades per il run 2B discussi in dettaglio nella riunione del Maggio scorso
  • Progetti che coinvolgono gli italiani
    • Nuovo tracker a microstrip (Padova, Bologna, Roma1)
    • Nuovo preradiator (Pisa [Siena], Roma1, Pavia)
    • Aggiunta di timing sui calorimetri elettromagnetici (LNF)

F. Bedeschi, INFN-Pisa

svx iib
  • Overall design complete
  • Basic element (stave) is near being built and tested

F. Bedeschi, INFN-Pisa

svx iib the stave
SVX IIB – The Stave

Mini PC

  • 2 sensors/hybrid = 1 module
  • 3 modules/side
  • 1 MPC/stave
  • 1 readout unit/stave
  • Stave is 66 cm long

Cooling tubes



Wing Cable


Pitch Adapter


Mounting holes

F. Bedeschi, INFN-Pisa

svx iib1
  • R&D advancing fast
  • All stave components available
    • SVX4 chip, Hybrid, detector, special cables, mechanics, mini-port-card
    • First functioning prototype in October 2002

SVX4 chip



F. Bedeschi, INFN-Pisa


F. Bedeschi, INFN-Pisa

  • Basic design understood
    • Important Italian group contributions to R&D
      • Optimization of tile performance
      • Simplification of tile construction
  • Current construction model:
    • Italian groups build basic tile for both preshower and crack chamber
  • R&D in progress to establish some design choices:
    • Best scintillator (Dubna/Bicron)
    • Best fibers (Kurarai/PoliHiTech)
    • Coupling of WS fibers

F. Bedeschi, INFN-Pisa


Dubna scint.

PoliHiTech fiber

  • Testing of tiles in progress in Pisa

~11 p.e./MIP

Test tile

F. Bedeschi, INFN-Pisa

em timing
EM Timing
  • Progress on inductive signal splitters
    • Tested during June shutdown operating CEM calibration LED flashers
      • Confirmed that introducing the splitters only delays the PMT signal by 800 psec

F. Bedeschi, INFN-Pisa

em timing1
EM Timing
  • Want to build as much of the system possible before the January shutdown (shutdown could be later …)
  • LNF responsible for ASD board, transition board and cables from ASD to TDC
    • Transition board design complete
    • Iterating with FNAL on ASD modifications required

F. Bedeschi, INFN-Pisa

run 2b upgrades1
Run 2B Upgrades
  • Review degli upgrades per il run 2B continua a FNAL
    • Director/technical review 12 Agosto scorso
    • Finalmente DOE baseline review inizia il 23 settembre
      • Il comitato invia le raccomandazioni al DOE (P. Rosen – Associate Director for High Energy Physics at Office of Science) che decide poi cosa fare sulla scala dei tempi della meta’ di Novembre
      • Partecipero’ alla review e dovro’ descrivere quale livello di appoggio l’INFN e’ disposto a dare al progetto
  • Richieste italiane a bilancio per 2003 includono una parte della produzione e sono consistenti con il piano di Maggio 2002
    • Importante un parere favorevole della commissione anche se condizionato all’approvazione del DOE e alla finalizzazione di alcune scelte tecniche

F. Bedeschi, INFN-Pisa

run iib upgrades
Run IIB Upgrades
  • Quadro finanziario del run 2B
  • Il totale M&S+ R&D e’ aumentato solo per la definizione degli impegni di Bologna (+38 k€) rispetto a Maggio 2002

F. Bedeschi, INFN-Pisa

mof 2003
MOF 2003
  • Alla riunione di Maggio del FRC discusso un “ragionevole” bilancio per Operations di 3.1 M$
      • Naturale contributo italiano (stimato su 82 fisici/66 FTE) $ 410 k
      • Questo e’ il numero usato per i preventivi 2003 (415 k€)
  • La certificazione della composizione del bilancio complessivo deve essere fatta da uno “scrutiny group”
    • Mont promette che formera’ presto questo “scrutiny group”
    • Il carico da spartirsi potrebbe crescere!
      • Bisogna mettere da parte almeno i 415 k€ richiesti
      • Una parte dovra’ essere SJ alle delibere dello scrutiny group e del FRC nel prossimo anno
      • Saggio prevedere lo sblocco a Giugno 2003 quindi il finanziamento attuale deve essere consistente

F. Bedeschi, INFN-Pisa