Stato di CDF

22 Settembre 2005

Giovanni Punzi

(Pisa)

Highlights

• Run IIb upgrades completi all’85%– Completamento previsto nella prima parte del 2006– SVT Upgrade 2/3 completo e operativo

• Nuovo record di luminosita’: 1.4 E32 (4 Agosto)• 1 fb-1 su nastro (10 Settembre)• Il rivelatore e’ stabile e funziona bene• Software di ricostruzione e’ stabile• La latenza tra la presa dati e la disponibilita’ dei dati

processati per l’analisi e’ stata ridotta a ~ 6 settimane• Shutdown rimandato al 2006 (date ancora incerte)• Gli istogrammi accumulano statistica…

Data Taking Efficiencies

Initial Luminosity (1030 cm-1s-1) Data Taking Efficiency

~85% of Run IIb Upgrade Projects were commissioned with beam during this period.

Record 1.4 x 1032

2002 2003 2004 2005 2002 2003 2004 2005

83%

Data for Physics

COT Compromised Period

QCDElectroweak, Beyond SMBTop

Sep-Dec ‘04 Shutdown

Recorded

SM Higgs

Data up to Aug. 2004 Recorded: 530 pb-1

Physics: 320 - 470 pb-1

Data up to Aug. 2005 Recorded: 950 pb-1

Physics: 620 ~ 880 pb-1

Store Number (Aug.23,2005)

Achieved vs Projected Integrated Luminosity

On the path to 8 fb-1 integrated luminosity in 2009

Projected Peak Luminosity

Top Line: all run II upgrades workBottom line: none work

First e-cooling demonstration – 07/15/05

-0.002 -0.001 0 0.001 0.002

Fract. momentum spread

Dist. function (arb. units)

Pbar beam: 63.5e10Barrier-bucket bunched.Bunch length 1.7-usTr. emittance (95%,n) kept at 4-pi mm-mradElectron beam current: 200 mATraces are 15 min apart

CDFII Challenge

Continuare a raccogliere dati efficientemente a luminosita’ crescenti fino al 2009

DAQ / Trigger Specifications

Run IIa Specification

Run IIa Achieved (typical)

Run IIb Specification

Peak Luminosity 0.9 x 1032 0.9 x 1032 3.0 x 1032

L1 Accept 45 kHz 25 kHz 30 kHz

L2 Accept 300 Hz 350 Hz 1000 Hz

L3 Accept 75 Hz 80 Hz 100 Hz

Data Logging 20 MB/s 20 MB/s 60 MB/s

Deadtime Trigger 5% 5% 10%

Physics Triggers a 3 x 1032 cm-2 s-1

• La Trigger Table attuale funziona bene fino a ~1.5 x 1032 cm-2s-1

– Significativo e continuo sforzo di miglioramento su molti fronti• Trigger upgrades: migliore purezza con meno processing time.

– Alcuni prescale sono stati addirittura rimossi (multibody B trigger !)• Veto high multiplicity events

• Trigger Table in sviluppo per ~3 x 1032 cm-2s-1

– 2/3 della statistica comunque raccolti a L<1.5 x 1032

– Strategy: high purity triggers for high luminosity, inclusive heavy flavor triggers at low luminosity (allow larger deadtime)

– Straw Trigger Table in Ottobre 2005.• Scelta finale dei triggers basata su priorita’

di fisica e purezza• Importante contributo italiano anche qui.

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Lpeak = 3 x 1032

In 3.5 hours,L < 1.5 x 1032

hours

L(1032)

Run II Publication Status

• 2005 Goal:– 40 submitted papers

• 2005 Status:– 20 submitted papers (9 published, 2 accepted)– 10 papers - drafts under collaboration’s review

• Results approved by CDF physics groups• Drafts approved by internal reviewers

– “Godparents committee” assigned for each paper.

– 27 papers - under godparents committee’s review• Results approved by CDF physics groups

year 2003 2004 2005 (until september)

# submitted 4 1720

(erano 8 a Maggio)

http://www-cdf.fnal.gov/physics/pub_run2/

Italian group contributions to analysis

• B/charm physics– Topics: Bhh (ACP, BR), bp, BsDs & lDs (for Bs mixing), B lifetimes, Bs

BdK*, BK (ACP, BR), D0hh (BR, ACP), D+πππ, pentaquarks, – Groups involved: Padova, Pisa, Roma, Trieste

• High-pt physics– Topics: Zbb, Higgs searches, top physics, hadronic top, top backgrounds, b-tagging,

W+jets, forward W’s– Groups involved: Bologna, Padova (Trento), Pisa, Roma

• Contributions to crucial analysis tools– Computing, sample skimming– Particle Identification with TOF and COT dE/dx– High-Pt b-tagging development– Jet Energy resolution and scale

• Most work in close cooperation amongst Italian groups• A lot of work in close cooperation with non-Italian groups

Wide range of activities: today only a few highlights

l

n

W+

W-

t

t

b-jet

b-jet

jet

jet

Mjj(W)

W ->2 jets calibrano la scala dei jet negli eventi top stessi

Stessa scala per b-jet e light quark (per ora)

Current Best: Fit contemporaneo 2-D alla massa del top e alla scala dei jet (JES) da Mjj(W) nel campione lepton+jets

Mtop

M top =173.5−3.6+3.7 (stat+ JES) GeV/c2 JES =−0.10−0.80

+0.78 (stat) σ

Prospects

Bs

Charmless BVV

BdK*

estimated yield:

123 events

estimated yield:

44 events

•BdK*: yields 123 (CDF 360pb-1) (compare to 173 (Belle 250fb-1) [hep ex/050313] Equivalent uncertainty on polarization measurement

Bs First observation with 180 pb-1 [PRL 95,031801 (2005)]. Analysis update

underway: 12 events 44 events (360 pb-1).

Update BR measurement. Measuring polarization: expect 0.10-0.15 resolution on long. polarization (similar to B-factory first PRL)

Verso la misura del Bs mixing

• Le estrapolazioni assumono di integrare la meta’ della luminosita’ dal 2007 in poi (B-physics solo da meta’ store)

• Sensibilita’ al range favorito dal fit di unitarieta’• In case of no signal 95% C.L. up to 30 ps-1 with 4 fb-1

CDF “Bs Mixing Group”

• ~70 physicists ( 22 italians, 9 phd/post-doc) in CDF are actively involved in the Bs mixing project– Improving the trigger strategy– Understanding the detector– B Lifetime Measurements– Flavor Tagging– B0 Mixing– Bs Mixing

• Big collaborative effort:–Analyse 3 different datasets–Reconstruct 0(20) different decay modes–Perform 2 parallel analysis for both hadronic and semileptonic modes–Study 4 different tagging algorithms–TOF and dE/dx calibrations

Here I mention just two examples of italian contribution

Same side Kaon tagging

B0

B-

Bs

K*0

K+

K- K*0

•Exploits the charge correlation between the b quark and the leading product of b hadronization. Based on PID capability.•Big hopes: initial studies indicate D2 ~3% vs current ~1%

1. Measure K distr. in data2. Tune MC D2

Campione addizionale di Bs semileptonici

+

4GeV-lepton + 1 displaced track trigger

2 displaced track trigger

Additional new sample overlap with the one already used ~ 20%

Effective ~ X 3 more semileptonic Bs yield to be used for MIXING

Basic tools: PID

pK

•Moderate separation at CDFaccurate modeling is crucial •Great effort devoted both to TOF calibration (better resolution) + t0 (reduced tails) and COT dE/dx calibration over wide range

•J/ee, ee•J/mm•D*±D0 s(k) s

• p

Parameterize and combine TOF+dE/dx in a single likelihood

Maximal performance from a unified tool

•Central to many analyses: B reco, Flavor tagging

TOF

dE/dx

• Update analisi in corso: 180 pb-1 360 pb-1

Total yield ~2600 ev (was 900)

• Estimated yields:

~1600 BdK+ - ~400 Bd+ -

• ~700 BsK+K- : (first observed w/ 180 pb-1)

– Misura accurata BR (large U-spin breaking?)

– CP state: Misura lifetime: ~light s

• ?? BsK Visibile… o contraddizione con la teoria.– Limite da 180 pb-1 <5.4·10-6 . Expect (6÷10) ·10-6

• ?? Bs , BdKK Constrain/misura contributi di annichilazione (BR(Bs piu’ grande, meno fondo piu’ sensibile. CDF ha gia’ il Best Limit da 180pb-1 )

180 pb-1

360 pb-1

Charmless BPP

250 fb-1 BaBar)

Direct ACP(B0 K)

Babar -0.133 0.030 (stat.) 0.009 (syst.) Belle -0.113 0.022 (stat.) 0.008 (syst.)

HFAG 2005

ACP compatible with B-factories, systematic uncertainty comparable

In progress: 360pb-1 (ACP)= 4% World best: 2.2% (Belle)

Full RunII statistics: (ACP) 1%

•Other large direct ACP around the corner (unobserved modes!):

•BsKπ (sensitive to , similar to Bdππ, but self-tagging)

bpπ

Lint

360 pb-1

~650 pb-1

CDF 180pb-1

Conclusioni

• Il Tevatron sta seguendo le previsioni piu’ ottimistiche

• Gli upgrades di CDF sono quasi completati

• La collaborazione e’ impegnata a fondo nello sfruttare la luminosita’ per un ricco programma di fisica

BACKUP

s s

• BS J/ +- K+K-

• BVV decays: Heavy and Light state decay with distinct angular distributions and different lifetimes.

Back

• Result (260 pb-1)– 1/4 heavy - 3/4 light state– Lifetime - heavy ~ 2 x light

S / S = 0.71 +0.24-0.28 ± 0.01

• Lifetime difference measures“same” CKM element as m (oscillation frequency)

• Exciting!! Need more data– ~ 5 % sensitivity by 2009 ms = 10 ps-1 S / S = 7%

• Test still possible CP violation effect in Bs mixing

• Perfect U-spin simmetry would predict BR(BsKK)/BR(BdKpi) ~1, but some calculations predict 2 [A. Khodjamirian et al.,Phys.Rev. D68 (2003) 114007].

• Current result favors the second case, but resolution is insufficient

• Current resolution BR(BsKK)/BR(BdKpi) 1.70.31(stat.) more accurate measurement very desirable

• Test with 360 pb-1 will be decisive: expect resolution 0.14(stat.) .

Bs KK

Lint

360 pb-1

Silicon Detectors

• Radiation damage– > 90% of total radiation is due to collisions: NIM A514, 188-193 (2003)

– Bias voltage scans as luminosity accumulates• Study collected charge (hits on tracks) and mean noise• Measurements agree with predictions up to 1 fb-1.

• Efforts to increase the Silicon lifetime– Lowered Silicon operating temp. gradually from -6oC to -10oC.– Thermally isolated SVX from COT inert regions such that the silicon can

be kept cold during COT work.

Lifetime 0 10 fb-1 20 fb-1 30 fb-1 40 fb-18 fb-1

Predicted Silicon Lifetime (note the large uncertainties)

Run IIb Project Status

• Trigger and DAQ Upgrades– Level-1 Track Trigger (XFT):

• Add z (stereo) info for 3D tracking - In production– COT TDC modification to achieve L2 rate of 1000 Hz (readout time)

• 12 out of 20 crates are operational.– Level 2 decision system: faster,flexible - operational since April

2005– Level 2 Silicon Vertex Trigger (SVT)

• Faster - 3 step upgrade: the first 2 steps are operational.– Event Builder: operational since August 2005– Level-3 Computer

• 1st procurement placed(64 PCs) - replace current system in Nov’05

• 2nd procurement ready(64 PCs) - complete ~Jan.06– Data Logging (20 MB/s 60 MB/s)

• 1st step operational (~35MB/s), complete by end of 2005

Installation & commissioning parasitically without interrupting operations.

Run IIb Project Status

• Detector (Calorimeter) Upgrades– Central Preshower upgrade

• Replacing with a finer segmentation system for higher lum.

• operational since early 2005

– Electromagnetic Timing

• New system for cosmic ray rejection

• operational since early 2005

• Run IIb Status– The project is ~85% complete and operational.

– 100% by early 2006.

– commissioned without interrupting operations.

Extrapolation of Trigger Rates

a highly non-linear behavior

Level-2 high pT electron Level-2 high pT muon(0.6 < || < 1.1)

~1% bandwidth at 3 x 1032 cm-2s-1 ~50% bandwidth at 3 x 1032 cm-2s-1

Bunch-by-bunch luminosity gives a better lever arm for the extrapolation.

Example of planned improvements: XFT upgrade

Confirmation of XFT tracks by stereo layers is expected to yield a substantial reduction of fakes

Straw Trigger Table - Projected L2 Rates

Straw Trigger Table - Projected L2 Rates

~75% of bandwidth at 3x1032 cm-2s-1

No room for B & some of new phenomena~30% of bandwidth at 3x1032 cm-2s-1

Studying further improvement

Triggers for W, Z, Top, WH, ZH, HWW, SUSY (partial), LED, Z’

without XFT upgrade with XFT upgrade

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Peak Luminosity = 3E32

Typical Projected Store Evolution