CDF: Status Report
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Transcript of CDF: Status Report
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CDF: Status Report
Status of the TevatronStatus of the CDF detectorFirst results with Run II dataRun IIB upgradesMOF status
Outline
Main Injector
Tevatron
CDF
Franco BedeschiINFN - Pisa Riunione Gruppo 1Catania, 18/9/02
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Tevatron status
Tevatron operation updateLuminosity 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 June35 pb-1 are on tape
10 – 20 pb-1 used for analyses shown at Summer Conferences
February 02 - June 02 period
Sample doubled with new data
Integr. Luminosity
Delivered
On tape
54 pb-1
35 pb-1
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1/1/02 4/1/02 6/30/02 9/28/02 12/27/02
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x 1
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30 Peak
luminosity
Slow increase
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0
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1-Jan-02 1-Apr-02 30-Jun-02 28-Sep-02 27-Dec-02
Date
pb
^-1 2002 delivered luminosity
Church planLinerar extr.Quadratic extr.
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 shutdownComplete 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
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Tevatron Status
Run IBRunIIA Goal
(wo/ recycling)RunIIA
(achieved*)
Protons/bunch 2.30E+11 2.70E+11 1.75E+11
Antiprotons/bunch 5.50E+10 3.00E+10 14.7E+09
Total Antiprotons 3.30E+11 1.08E+12 5.30E+11
Antiproton Production Rate 6.0E+10 2.0E+11 1.1E+11 hour-1
Accumulator->150 GeV efficiency
0.80 0.90 0.80
150 GeV -> Low efficiency 0.80 0.90 0.60Accumulator -> low efficiency 0.64 0.81 0.48Proton emittance (95%, norm) 23 20 16 mm-mrPbar emittance (95%, norm) 13 15 15 mm-mrBeta @ IP 0.35 0.35 0.35 mBeam Energy 900 1000 980 GeVBunches 6 36 36Longitudinal Emittance (protons) 5 3 4 eV-secLongitudinal Emittance (pbars) 5 3 4 eV-secForm Factor (Hourglass) 0.59 0.70 0.65Typical Luminosity 1.6E+31 8.08E+31 2.64E+31 cm-2sec-1
*”Achieved” refers to simultaneous performance. Best individual parameters are higher.
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Injection and acceleration
Shot 1583 showing:Loading of 36 proton
bunches at 150 GeVPoor lifetime at 150 GeVSignificant beam loss on
accelerationLoading of 9x4 antiproton
bunches at 150 GeVDitto
Luminosity potential3.6E31 if acceleration
losses eliminated, >4E31 if lifetime improved.
antiprotons
protons
Beam current
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Tevatron Status
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Date
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Church plan
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Church plan
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p-bar transfer efficiencyChurch plan
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^9 protons/bunch
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CDF data taking efficiency
Avg. efficiency in data taking ~80%Goal is > 90%Reached already in
several occasions
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Status of the CDF Detector
New
Old
Partially new
Forward muonEndplugcalorimeter Silicon and drift
chamber trackers
Central muonCentral calorimeters
Solenoid
Front endTriggerDAQOffline
TOF
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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 ‘02SVT very successful and improving
L2 problems largely solved
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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
3962.5
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Detector Performance
Commissioning:L00 > 95%SVXII > 90% ISL > 80%
Completing cooling work
% of silicon ladders powered and read-out
June shutdownISL almost fixed
* Concern about loss of connection to z-side in special situations. 4 ladders affected recently
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Detector Performance
Silicon detectors:Typical S/N ~12Alignment in R- good
First reliable R-z iteration in production soon
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Detector Performance
TOF resolution within 10 –20% of design value Improving calibrations and
corrections
TOFS/N = 2354/93113
S/N = 1942/4517
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Detector Performance
XFT: L1 trigger on tracksfull design resolution
pT/p2T = 1.8% (GeV-1)
= 8 mrad
Efficiency curve:XFT cut atPT = 1.5 GeV/cXFT
track
Offline
track
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Detector Performance
Secondary VerTex L2 trigger Online fit of primary VtxBeam tilt alignedD resolution as planned
48 m (33 m beam spot transverse size)
15% efficiency increase after downloading updated associative memory patterns (mostly Italian work)
NOT available in analyses that follow
=48 mOnlinetrackimpactparam.
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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 plotsQuality of standard signaturesRates of basic physics signalsSurprisingly some results are already of relevance in spite
of the limited statisticsSeveral CDF presentations made in the parallel sessions
In the following brief/incomplete summary of a lot of work
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Data Sample
Stable physics trigger table established since February ’02Summary 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.
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EM Calorimeter scale
638 Z e+e in 10 pb-1
(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% simulationResolution: +4% simulation
Central-central
Central-West plug
Central-East plug
NZ = 247
NZ (W+E) = 391
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Measurements with high Et e±
Uncorrected Z e+e angular distributions and asymmetries
Measurements compared with Pythia/CTEQ5L prediction
BackBack to index
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Measurements with high Et e±
Clear evidence for W e signal Isolated central electronEt > 25 GeV, Et >25 GeV
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Measurements with high Et e±
Good modeling of observed W e distributions
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MET resolution
Minimum bias events Run 1: 0.53/ Et with forward cal. Use ||<4.2 Run II: 0.60/ Et with plug only ||<3.6
With miniplug ||<5.5
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Measurements with high Et e±
W cross section:W*BR(We) (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
Background:- QCD: 260 ± 34 ± 78- Z ee: 54 ± 2 ± 3- W: 95 ± 6 ± 1
0.16 now!0.10 soon!
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Measurements with high Et ±
Clear evidence of Z +
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
1
2
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Measurements with high Et ±
Good modeling of observed W distributions
Measure (W) and R=(W)/(Z)
MET
Longitudinalbeam profile
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Measurements with high Et ±
MT
W cross section:W*BR(W) (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
Background:- QCD: 104 ± 53- Cosmics: 73 ± 30- Z : 247 ± 13- W: 145 ± 10
R=(W)/(Z) = 13.66±1.94stat±1.12syst
Consistent with Run 1 results
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W
Evidence for typical decay multiplicity in W selections
Back to index
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Measurements with low Et ±
trigger improvedpT
> 2.0 1.5 GeV
> 5° 2.5°
Observed rates are consistent with expected increase due the lowering of the thresholds
13 pb-1
NoSilicon100k
= 21.6 MeV
Centralmuons only
15 MeV with Silicon
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Measurements with low Et ±
Inclusive B lifetime with ’sFit pseudo-c =
Lxy*FMC*M/pT
distribution
Output: b lifetime, fraction of from Bc=458±10 stat. ±11 syst. m
(PDG: 469±4 m)
from B = 17% (pT > 4 GeV)
Resolution function from large prompt componentR = narrow + wide Gaussian (19%)
+ exponential tails (1.2%)Scale factor on error returned from
vertex fit 1.069
Resolutionfunction
~ 46%
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Measurements with low Et ±
Use ’s to understand E-loss and B-field corrections
Check with other known signals
Raw tracks
Correct for material in GEANT
Tune missing material ~20%
Add B scale correction
D0
1S
2S3S
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Measurements with low Et ±
(2S)
Bu
CDF 2002 PDG/(2S) 3686.43±0.54 0.86 6.00
Bu 5280.60±1.70±1.1 0.77 4.05
Bd 5279.80±1.90±1.4 0.17 4.72
Bs 5360.30±3.80± -1.81 1.902.102.90
CDF) PDG)
B masses:(2S)J/ (control)Bu J/
Bd J/Bs J/ More mass plots
lifetime
semi-leptonic B
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Measurements with low Et ±
More mass plots:Bd, Bs
Bs
BackBack to index
BdK*0
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Measurements with low Et ±
B+ lifetime:B+ J/ K+Fit results:
c=446±43±13 m
( PDG/ = 1.2)
Res. scale factor 1.16
Conservative systematic error
# B+ ~ 154
BackBack to index
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Measurements with inclusive leptons
Find large samples of semileptonic B decays
BackBack to index
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Measurements with jets
Raw Et only: Jet 1: ET = 403 GeV Jet 2: ET = 322 GeV
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Measurements with jets
Expectations: Increase max. energy reachStudy both central and forward
New physics is mostly centralPdf’s affect both regions
Current work:Accumulate large samplesUnderstand energy corrections
E-scale, jet shapes, MC tuning
Run 1Run 2aRun 2b
Cen
tral
jet
sF
orw
ard
jet
s
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Measurements with jets
Jet distr. from dataRaw ET
Each trigger
rescaled for
pre-scale factor
Fixed cone algorithm: R = 0.7
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Hadronic Energy Scale
Use J/ muons to measure MIP in hadron calorimeters (Run II)/(Run 1) =
0.96±0.005
Gamma-jet balancing to study jet response fb = (pT
jet – pT)/pT
Run Ib (central): fb= -0.1980 ± 0.0017
Run II (central): fb= -0.2379 ± 0.0028 Plug region corrections in progress
centralcalor. Plug regionPlug region
fb = (4.0 ±0.4)%
q
g q
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Measurements with jets
Jet shapes:Narrower at higher ET
Calorimeter and tracking consistent
Herwig modeling OK
16 pb-1 used for this study
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Measurements with hadronic b triggers
L2 trigger on 2 tracks: pt > 2 GeV
|D| > 100 m (2 body)|D| > 120 m (multibody)
Swamped by D mesons! But see B’s as well…. CDF Run 2 preliminary
D0 K
ND=56320
10 pb-1
D+Ds
+ Ds± - D± mass difference
Both D (KK)m=99.28±0.43±0.27 MeV
PDG: 99.2±0.5 MeV
Systematics dominated by background modeling
23601350
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Measurements with hadronic b triggers(important Italian contribution)
Measure ratios of CKM suppressed decays(DKK)/(DK) = (11.17±0.48±0.98)% (PDG: 10.84±0.45)
Main systematics (8%): background modeling
(D)/(DK) = (3.37±0.20±0.16)% (PDG: 3.76±0.20)Main systematics (4%): relative acceptance
Signal: 5670 Signal: 2020
L = 10 pb-1
CDF Run 2 preliminary CDF Run 2 preliminary
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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%
GaussianK0S
Range of fract. from B using two extreme resolutions functions: - single gaussian - parametrization from K0
S sample
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Measurements with hadronic b triggers(important Italian contribution)
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+ = 56±12
#B = 33±9
B+ D0 +B h+ h
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Conclusions on Tevatron and detector status
Tevatron is slowly improvingThe CDF detector is fully functional and accumulating
proton anti-proton dataUnderstanding of detector is advancedMany early physics results
sometimes competitive in spite of limited statistics
Ready to exploit full Tevatron potential as luminosity increases
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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 italianiNuovo tracker a microstrip (Padova, Bologna, Roma1)Nuovo preradiator (Pisa [Siena], Roma1, Pavia)Aggiunta di timing sui calorimetri elettromagnetici (LNF)
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SVX IIB
Overall design completeBasic element (stave) is near being
built and tested
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Cooling tubes
Mounting holes
Chips
Hybrid Pitch Adapter
Sensors
SVX IIB – The Stave
Wing Cable
Mini PC• 2 sensors/hybrid = 1 module• 3 modules/side• 1 MPC/stave• 1 readout unit/stave• Stave is 66 cm long
Mounts
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SVX IIB 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
Hybrid
sensors
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Preshower
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Preshower
Basic design understood Important Italian group contributions to R&D
Optimization of tile performanceSimplification of tile construction
Current construction model: Italian groups build basic tile for both preshower
and crack chamberR&D in progress to establish some design
choices:Best scintillator (Dubna/Bicron)Best fibers (Kurarai/PoliHiTech)Coupling of WS fibers
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Preshower
Testing of tiles in progress in Pisa
Test tile
Dubna scint.PoliHiTech fiber
~11 p.e./MIP
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EM Timing
Progress on inductive signal splittersTested during June shutdown operating CEM calibration
LED flashersConfirmed that introducing the splitters only delays the PMT signal by 800 psec
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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 TDCTransition board design complete Iterating with FNAL on ASD modifications required
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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
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Run IIB Upgrades
Quadro finanziario del run 2BIl totale M&S+ R&D e’ aumentato solo per la definizione
degli impegni di Bologna (+38 k€) rispetto a Maggio 2002
Plan M&S + Total Funded Requested SJ ProjectProject Subproject Sezione May '02 R&D funded 2002 2003 2003 FTE FTESilicon Mechanics Bologna 38 473 38 5.1 1tracker Chip/PS Padova 335 55 25 130 130 3.1
Trigger Pisa 50 0 0.5Trigger Trieste 50 0 0.5
PreshowerScintillator - fibers- PS - Cables
Pisa 202 202 10 10 120 95 3 2
Pavia 0 0.5Roma1 0 0.5
EM timing LNF 144 144 10 10 134 124 1.9 1.9CSX Scintillator Pisa 80 80 80 80 1.5 1.5Totali 899 899 155 125 422 349 10 10
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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