WHEPP 9 12006/1/6

Current results and future prospects at Tevatron

Contents1. Recent status and plan of Tevatron

2. Physics program at Tevatron by 2009 shutdown

3. Recent physics results and prospects

4. 　　　　　 (1) Top and indirect Higgs search

5. (2) direct Higgs search

6. (3) flavor sector

7. Summary

T. Maruyama　（ Univ. of Tsukuba）For CDF / D0 collaborations

WHEPP 9 22006/1/6

CDF / D0 collaborations

CDF Collaboration (12 countries, ~600 authors)CDF Collaboration (12 countries, ~600 authors)

Compact collaborations ! (compared to LHC)

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2.82.4

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Tevatron complex in Run II

p – p collisions at s = 1.96 TeV. Peak luminosity 1.71032 cm-2 s-1. p recycler is being used as p stacking recently. (not for recycler) ： success!! Electron cooling was successfully installed for shots to Tevatron. (Obtaining smaller beam emittance, We will see difference more in future.) Designed (in 2004) luminosity was delivered successfully in FY05.

Recycler: ring to reuse the pbar which did not interact to proton. Electron cooling: electron is to run parallel to beam to make beamemittance smaller. Tev: 36 X 36 bunch colliding

WHEPP 9 52006/1/6

Data delivered to date

FY05

FY04

FY03

FY02

1.44 fb-1 delivered, 1.15 fb-1 on tape (CDF)

(80% data taking eff. - 20% ineff. Includes ~5% Trigger/DAQ dead time)1.0 fb-1

good for physics without silicon, 0.9 fb-1 good for physics with siliconD0 has similar amount of the data in the tape!

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Projected Data Sample Growth

9/30/03 9/30/04 9/30/05 9/30/06 9/30/07 9/30/08 9/30/09

30 mA/hr

25 mA/hr

20 mA/hr

15 mA/hr

Inte

gra

ted

Lu

min

osi

ty (

fb-1)

9

8

7

6

5

4

3

2

1

0

End FY05:Double data up to FY04

End FY06:Double data up to FY05

End FY07:Double data up to FY06

End FY09:Double data up to FY07

WHEPP 9 72006/1/6

Performance of Tevatron

100E30

100E30

Sep-2005 Sep-2005

Designed peak luminosity to obtain 8.5 fb-1

Real peak luminosity up 　 to Sep-2005

Integrated luminosity in FY05Red : designed, blue : base (min.)

Tevatron is working well !!

FY02FY03FY04FY05

Sep-2009

400 pb-1

WHEPP 9 82006/1/6

DAQ / Trigger Specifications (CDF case)

Run IIa Spec.

Run IIa Achieved (typ

ical)

Run IIb Spec.

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

Event Builder 75 MB/s 75 MB/s 500 MB/s

L3 Accept 75 Hz 80 Hz 100 Hz

Rate to Tape 20 MB/s 20 MB/s 40 MB/s

Deadtime Trigger

5% 10% 5% + 5% **

* Run IIa L1 Accept not achieveddue to higher than specified Silicon Readout and L2 Trigger execut

ion times.** Assume ~5% from readout and

~5% from L2 processing

~50% of bandwidth at 3x1032 cm-2s-1

Studying further improvement

Triggers (Run IIb) for W, Z, Top, WH, ZH, H->WW, SUSY (partial), LED, Z’

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High Lum. Impact on Reconstruction / Physics Analysis Techniques

W Mass (example)

　 At higher inst. luminosity, there should be more # of inelastic interactions at each bunch, so we expect missing ET can be skewed.

Using lepton PT would give smaller systematic uncertainty than that using traditional transverse mass.

MTW

0.2 x 1032 cm-2s-1

1.0 x 1032 cm-2s-1

2.0 x 1032 cm-2s-1

3.0 x 1032 cm-2s-1

pTlepton

Instant. Lum.

(cm-2 s-1)

# interactions per bunch

0.2 x 1032 0.5

1.0 x 1032 2.5

2.0 x 1032 5.0

3.0 x 1032 7.5

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Physics program of Tevatron before shutdown Tevatron Shutdown ：　 2009 (2008?) 　　 What are the interesting Tevatron physics topics under

running of the LHC? How do we reduce the time rug between provided lumino

sity and that used in analysis? （ Integrated luminosity is 1.1fb-1 now, while CDF uses ~0.7fb-1 in winter ）

What are the main physics programs? (related to trigger)example 　 flavor sector: BS mixing ： mS / md 　　　　　　　　　　　　 rare decay : BS etc 　 electroweak sector + top 　 : 　 W mass 　　　　　　　 top mass 　　　　　　　 Higgs Boson searc

h New Physics search : non-SM Higgs SUSY, extra dim., compositeness 　 etc.

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top and indirect Higgs search

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Indirect Higgs mass search with Mtop and MW

Higgs mass can be constrained from precise W mass and top quark mass measurements using the formula above (radiative correction). Also sensitive to new physics if loop exists.

Current CDF Run II best single measurement 173.5+3.9

-3.8GeV/c2 and all combined value (Run I+Run II, CDF+D0, pick up best meas. in each channels) 172.7 2.9 GeV/c2

Current best MW is inferred by LEP2 (80.392 0.039 GeV/c2), and world average is 80.410 0.032 GeV/c2.

Best Higgs mass 91+45-32 GeV/c2 an

d upper limit 186 GeV/c2 @ 95% C.L.

)1)(/1(222

2

rmmGm

ZWF

EM

W

Old : result in 2004

WHEPP 9 132006/1/6

Combination of top mass measurements

Use only best analyses from each decay mode, each experiment.

Run I (~100pb-1) Run II(~350pb-1)

WbWbXXttpp Both Ws -> l(dilepton: 5%)One W->2jets / one W->l (lepton+jets : 30%)Both Ws -> 2 jets (all had: 44%)

CDF-I all-h

D0-II l+j

CDF-II l+j

D0-I l+j

CDF-I l+j

CDF-II di-l

D0-I di-l

CDF-I di-l

-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0

1

Weight (%)

CDF-I l+j

All systematic uncerainty correlationsare taken into account as properly as possible!! (statistically independent)

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Future Improvement

Basic improvement by 1/L - L0.7fb-1 in this winter. - Further improvement on JES b

y direct b-jet JES calibration by Z bb events. Current b-jet JES taken same as generic jet + additional uncertainty according to LEP/SLD measurements.

Sig./Bkgd. Modeling (ISR/FSR/Q2 dep

endence etc.) can be improved by using our own data.

Measurement in All Hadronic mode is coming soon.

GeV/c2

Result 172.7

Stat. 1.7

JetEnergyScale 2.0

Sig. Model 0.9

Bkgd. Model 0.9

Multi-Interaction 0.3

Fit Method 0.3

MC Generator 0.2

Total Syst. 2.4

Total Error 2.9

Combined Result:

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n

W+

W-

t t

b-jet

b-jet

jet

jet

New Method to constrain Jet Energy Scale

Mjj(W)

Use W2 jets to calibrate Jet Energy Scale (fully in situ). This scale is applied to b-jets and light-quark jets.

Do a cross-check for our standard JES calibration obtained in dijet, photon+jet environment.

Two dimensional fit for JES and Mtop simultaneously.

This method makes the largest systematic uncertainty as statisticalissue !! We will achieve uncertaintyMtop ~ 2 GeV/c2 w/o no improvementat 2 fb-1. (note: this is only single measurement at CDF)

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)stat(10.0JES 78.0

80.0

Results on the JES from the 2D Fit

Variation of Mjj as a func.of JES ( ~3 GeV/c2) Data Mjj

2 b-tag jets sample

1 b-tag jets 4 high ET jets

1 b-tag jets 3 high 1 loose

0 b-tag jets

Mtop (GeV/c2)

JES

()

Mtop = 173.5+2.7-2.6(stat) 2.8 (syst) GeV/c2

= 173.5+3.9-3.8 GeV/c2

Result of 2D fit

PRL / PRD accepted ( to be published )

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Summary of Top Mass Measurements

Many cross-checks, combined best ones from each channels

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W mass status (CDF) Chamber wire positions: aligned <10 mPassive material between IP and COT: x-ray using e+e-, check e’s E/p tailMomentum scale: J/ mass, check Upsilon and Z massEnergy scale: e’s E/p peak, check Z massUncertainty on MW: total 76MeV/c2

: 85, e: 105 MeV/c2

center value is still blinded.E / p of W electrons

1 / pT(GeV-1)

p / p

p / p = - 0.0010 ± 0.0001

J/+- mass vs 1/pT

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Electroweak Projections

MW [MeV] MTop [GeV] MHiggs / Mhiggs [%]

Luminosity/Experiment [fb-1] Luminosity/Experiment [fb-1] Luminosity/ Experiment [fb-1]

10-1 1 1010-2 10-1 1 10

2

3

50

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Other Top Quark PropertiesOther Top Quark Properties

• Understanding on top quark profile will be significantly improved by statistics in next a few years.

• Any significant deviation from standard model prediction could indicate new physics.

e.g. cross section is sensitive to production and decay anomaly.

p

p t

b

W

q

q’

t b

W+

l

X

Production cross-section

Resonance production

Production kinematics

Top Spin Polarization

Top MassW helicity

|Vtb|

Branching Ratios

Rare/non SM Decays

Anomalous Couplings

CP violation

Top Spin

Top Charge

Top Width

_ _

_

_

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Does something new produce ttbar? Search for new massive resonance decaying to top pairs

Constraint top mass = 175GeV/c2 D0 uses lepton+≥4jets (b-tag) with traditional kinematic fitter, while

CDF uses lepton+=4jets (no-btag) with matrix element technique. Fix most of SM backgrounds to expected rate

Use theory prediction of 6.7pb for SM top pair production

Interesting fluctuation in both experimentsdouble stat. in winter

2006/1/6 WHEPP 9 22

Direct Higgs search

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Standard Model Higgs

• Precision data prefer light SM Higgs• SUSY requires light Higgs.• studies in 1999 and 2003 predicted consistent result:

•2 fb-1: 95%CL exclusion at mH=115 GeV/c2

•5 fb-1: 3 evidence at mH=115 GeV/c2

• If Higgs mass is small, TeV could compete.

Inte

grat

ed lu

min

osity

(/f

b)

WHEPP 9 242006/1/6

Direct Higgs Search

Both CDF and D0 have started the hunt

WHEPP 9 252006/1/6

WHEPP 9 262006/1/6

How Do We Get There?

Improvement WH->lvbb ZH->vvbb ZH->llbb

mass resolution 1.7 1.7 1.7

Continuous b-tag 1.5 1.5 1.5

Forward b-tag 1.1 1.1 1.1

Forward leptons 1.3 1.0 1.6

Track-only leptons 1.4 1.0 1.6

NN selection 1.75 1.75 1.0

WH signal in ZH 1.0 2.7 1.0

Product of above 8.9 13.3 7.2

CDF+DØ combination 2.0 2.0 2.0

All combined 17.8 26.6 14.4

Assume current analyses as starting point Factor = 2003 Higgs sensitivity study / current analyses Reevaluated all improvements using latest knowledge

Expect factor ~10 improvements and CDF+DØ combination

WHEPP 9 272006/1/6

Improvement example: Lepton Selection

Forward leptons: factor 1.3 Current analyses use only up to

||<1.1 Electrons:

CDF: Forward electrons used alrea

dy by other analyses, e.g. W charge asymmetry

Up to ||<2.8 Central electrons: recently i

mproved efficiency from 80% to 90%

Factor 1.34 in acceptance Muons: 　

CDF:　　 uses only up to ||<1.0 can be extended since we hav

e detector.

~75% efficiency

W electron charge asymmetry

PRD 71, 051104 (2005)

35 < ETelectron < 45 GeV

WHEPP 9 282006/1/6

EJet Scale & Resolution: Status / Improvements

Jet energy scale uncertainty:• precision measurements (Mtop), searches• now ~2.5% uncertainty for jets in top decays • further improvements:

• generators, higher order QCD• better scale for ET > 100 GeV region• complete by end of this year

Jet energy resolution:• currently 17%, goal 10-11%• further improvements:

• combine track, calorimeter Info: 2%• expand cone size: 2%• b-jet specific corrections:1-2%• sophisticated algorithms: 1-2%• complete by spring 2006

H --> bb mass (GeV)

Mhiggs = 120 GeV

Scale Corrections0 50 100 150 200 250

0 50 100 150 200 250

Resolution Improvements

Raw

0.2

1.0

0

0.2

1.0

0

WHEPP 9 292006/1/6

Non-SM Higgs: Abb and A Supersymmetry (MSSM):

2 Higgs doublets => 5 Higgs bosons: h, H, A, H±

High tan: A degenerate in mass with h or H Cross sections enhanced with tan2 due to enha

nced coupling to down-type quarks Decay into either or bb:

BR(A ) ≈ 10%, BR(A bb) ≈ 90% Exact values depend on SUSY parameter space

Experimentally: pp Ab+X bbb+X pp A+X +X

•C. Balazs, J.L.Diaz-Cruz, H.J.He, T.Tait and C.P. Yuan, PRD 59, 055016 (1999)•M.Carena, S.Mrenna and C.Wagner, PRD 60, 075010 (1999)•M.Carena, S.Mrenna and C.Wagner, PRD 62, 055008 (2000)

WHEPP 9 302006/1/6

MSSM Higgs Searches

Accepted by PRL, hep-ex/0508051

|| = 200 GeVM2 = 200 GeVMgluino = 0.8 MSUSY

MSUSY = 1 TeV, Xt = √6 MSUSY (mhmax)

MSUSY = 2 TeV, Xt = 0 (no-mixing)

CDF Preliminary310 pb-1

2006/1/6 WHEPP 9 31

Flavor sector

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BS – BS mixing: Motivation

Yellow Band: md measurement: ~15% uncertainty

Orange Band: Lower limit onms = Upper Limit on |Vtd|

The lower limit on ms already gives a constraint to the Triangle

CKM Fit result: ms: 18.3+6.5

-1.5 (1) ： 2005 EPS

from md

from md/msLower limit on ms

00

Measure side of unitarity triangle: ms / md

B mixing : box diagram within SM

taking ratio : to reduce theoretical uncertainties

WHEPP 9 332006/1/6

Bs Mixing Analysis: Winter 2005

526 ± 33 events

With 355 pb-1

CDF 95%CL Limit: 7.9 ps-1

CDF Sensitivity 8.4 ps-1

~900 signal events with Bs Ds, Dslwhere Ds K*K,

0sB

sD

KK

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Bs Mixing Analysis: Fall 2005 Hadronic modes

Improved tagger (larger B0 calibration sample, NN for jet charge) Improved primary vertex (event-by-event reco., most inner Si layer added, better track resolutio

n understandings ) Added a new decay mode Bs DS 3(20% increase)

Semileptonic modes SVT 2-track trigger - greater than x2

With 355 pb-1

CDF 95%CL Limit: 8.6 ps-1

CDF Sensitivity 13.0 ps-1

CDF Preliminary

CDF Preliminary

WHEPP 9 352006/1/6

ms Sensitivity Projections

Scale to Current Yield Scale to Current Yield

Winter 2005

Fall 2005

Stretched

Baseline

Winter 2005

Fall 2005

Stretched

Baseline

95% CL Exclusion 5 Observation

0.4 fb-1 4 fb-1 8 fb-1

luminosity / experiment [fb-1] 0.4 fb-1 4 fb-1 8 fb-1

luminosity / experiment [fb-1]

WHEPP 9 362006/1/6

Rare Decay: Bs

910)9.05.3()( sBBRSM prediction (highly suppressed) :

(Buchalla & Buras, Misiak & Urban)

e.g. SUSY may enhance the rate :

(Babu, Kolda: hep-ph/9909476+ many more)

Expected #signal = 0, any signalwould indicate new physics

CDF results : 0 event was observed, corrsponding to Br < 1.6 x 10-7

WHEPP 9 372006/1/6

Rare Decay: Bs （（（ Projected reach (assuming no 　　 improvements to current analyses):

Exclusion at 90% C.L.: 4 fb-1: BR < 4 x 10-8 8 fb-1: BR < 2 x 10-8

Discovery at 5: 4 fb-1: BR = 1 x10-7

8 fb-1: BR = 7 x10-8

ATLAS (SN-ATLAS-2003-003): 5 discovery with L=1 fb-1 if Br=5x10-8

5 discovery with L=300 fb-1 for SM value

ATLAS

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Lifetimes

= 1.45 ± 0.13 ± 0.02 psSingle best measurement

in a fully reconstructed decay mode

CDF Preliminary370 pb-1

b0 J/0 Bc

0 J/eCDF Preliminary360 pb-1

= 0.474 +0.073-0.066 ± 0.033 ps

World’s best

TeV is making competitive and world leading measurementsfor all the heavier B hadrons.

WHEPP 9 392006/1/6

Observation of Bc J

bc

cc

ud

J/Bc

Used data up to Sept.4, 2005 and approved as of Nov.10, 2005.Demonstrates physics results with data through Feb.05 by next summer.

With 0.8 fb-1, CDF M(Bc) = 6275.2 ± 4.3 (stat.) ± 2.5 (syst.) MeV

Lattice QCD Cal. M(Bc) = 6304 ± 12 +18-0 MeV [hep-lat/0411027]

WHEPP 9 402006/1/6

So much more !! (but no enough time to show) Jet PT spectrum Charged Higgs excluded region

Q・ for single topcos for W helicity

ttbar cross secton

Z’ search

LQ search

BC meas. (J/ ) W’ search ET of W

Anomalouscoupling of W

Missing ET vs (WW)

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Summary

Tevatron is delivering good luminosity with almost same level as designed one.

For higher luminosity in near future, CDF/D0 should consider trigger and physics impact.

CDF and D0 are thinking on what are meaningful physics programs during running of LHC programs.

Core physics programs such as top mass has good shape and perspectives. (Tevatron average already gives the uncertainty by 2.9 GeV/c2 at ~350 pb-1)

To achieve the sensitivity study in 2003, some significant improvements is needed for Higgs search. CDF / D0 are making effort to achieve it.

TeV is producing impressive and important results !!

2006/1/6 WHEPP 9 42

Backup slides

WHEPP 9 432006/1/6

Silicon detector (SVX): top event b-tag: ~ 60%

COT: drift chamber Coverage: ||<1 Pt / Pt ~ 0.15% PT

Calorimeters: Central, wall, plug Coverage: ||<3.6 EM: E / E ~ 14% / HAD: E / E ~ 80% /

Muon: scintillator+chamber muon ID up-to ||=1.5

COT:tracking

Multi-purpose detector: precision meas. & search for new physics

CDF at Tevatron

MuonSVX EM cal

Had cal

))2log(tan( polar angle

WHEPP 9 442006/1/6

Tagging and Jet Energy Calibration

E/E ~ 3% at 50 GeV~xx% at 100 GeV~xx% at 200 GeVSubmitted to NIM

Better algorithms: Neural Network

Forward

Loose (1.8% mistag)Tight (0.6% mistag)

Jet

mis

-id (

%)

e

ffic

ien

cy (

%)

B Tagging (secondary vertex)

Hadronic Tau Tagging Evisible > 30 GeV

~50% efficient <0.5% mis-identified

WHEPP 9 452006/1/6

Top Mass vs ttbar cross section

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ZbbTrigger : 2 SVT track + 2 10G

eV clusters.Offline Cuts : N==2 jets w/ ET>20G

eV, ||<1.5 (JetClu cone 0.7).

Both jets are required to have secondary vertex tag.

(j1,j2)>3.0. ET

3rd-jet<10GeV.

WHEPP 9 472006/1/6

Current data (310 pb-1) has no excess

Sensitivity different in other regions of parameter space

Close gap to LEP with increasing datasets tan=40≈mtop/mb reached fo

r mA<240 GeV/c2

MSSM Higgs: Present and Future

WHEPP 9 482006/1/6

New Phenomena Searches

X e+e- searches(paper in preparation)

X top pair resonance searches(paper in preparation)

Z’ in ee

CDF Preliminary448 pb-1

Mee (GeV/c2)

CDF Preliminary319 pb-1

Projections

WHEPP 9 492006/1/6

Combination of top mass measurements

Correlation : uncorrelated

stat. fit method in situ JetEnergyScale(JES)

100% w/i exp (same period) JES due to calorimeter

100% w/i channel bkgd. model

100% w/i allJES due to fragmentation, signal model MC generator

Use only best analyses from each decay mode, each experiment.

Run I (~100pb-1) Run II(~350pb-1)

WbWbXXttpp Both Ws -> l(dilepton: 5%)One W->2jets / one W->l (lepton+jets : 30%)Both Ws -> 2 jets (all had: 44%)

WHEPP 9 502006/1/6

What if this were the only Mtop msmt?

WHEPP 9 512006/1/6

Reconfirmation of BC

BC meson was discovered in 1998 with CDF Run1 data. -- mass : 6.4 0.4 GeV/c2 -- lifetime : 0.46 0.18 ps

CDF Run2 reconfirmed the existence with higher statistics

Right plot : BC signal with J/+e+XInvariant mass for e(~ 360 pb-1 Run2 data.) 178 candidates against63.4 4.9 13.6 #bkg ev.in 4<M<6 region (5.9 )

.)(065.0)(043.0.)(040.0284.0)/()(

)/()(accbkgstat

KJBuBRBuXpp

lJBcBRBcXpp

WHEPP 9 522006/1/6

BS lifetime

World second best value !!

WHEPP 9 532006/1/6

Data for Physics (up to Aug. 23, 2005)

COT Compromised Period

QCDBeyond SMElectroweakBTop

Sep-Dec ‘05 Shutdown

Recorded

SMHiggs

WHEPP 9 542006/1/6

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

Detector downtimeBeam losses / incidents

Trigger deadtime ~5%: our choice

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

Record 1.4E32

2002 2003 2004 2005 2002 2003 2004 2005

80%

WHEPP 9 552006/1/6

TeV Projected Peak Luminosity to get 8fb-1

you are here

WHEPP 9 562006/1/6

Luminosity Profile

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0 2 4 6 8 10 12 14 16 18 20 22 24

34% 66%

Peak Luminosity = 3 x 1032

Time Hours

3.0

2.5

2.0

1.5

1.0

0.5

0

Average Peak Luminosity Projected Store Evolution

Focus has been on developing tools and understanding extrapolations.

bunch-by-bunch luminosity availableup to ~2 x 1032 cm-2s-1

WHEPP 9 572006/1/6

Rare Decay: Bs

910)9.05.3()( sBBR

SM prediction (highly suppressed) :

(Buchalla & Buras, Misiak & Urban)

e.g. SUSY may enhance the rate :

(Babu, Kolda: hep-ph/9909476+ many more)

Expected #signal = 0, any signal would indicate new physics

CDF results :0 event was observed.corrsponds to Br < 1.6 x 10-7

(#BKG: 0.81 0.21 top 　　　　　　　　 0.66 0.13 )

Invariant mass of different detector (top and bottom figs.)

WHEPP 9 582006/1/6

B Mixing in Standard Model Within the SM

B mixing: Box diagram q = d (B0) or s (Bs)

md = 0.510+0.005 ps-1 (HFAG 2005)

f2BdBBd = (228+30+10 MeV)2

Lattice QCD calculation |Vtd| determination limited by ~15%

Ratio between ms and md Many theoretical uncertainties are cancelled in the ratio

= 1.21+0.04+0.05 Determine |Vts|/|Vtd| 5%

precision

2*22

2222

6

)/(tbtqBqBqBq

WtWFq VVBfm

mmSmGm

2

2

22

2

2

2

td

ts

Bd

Bs

td

ts

BdBd

BsBs

Bd

Bs

d

s

V

V

m

m

V

V

Bf

Bf

m

m

m

m

WHEPP 9 592006/1/6

Unitarity Triangle

CKM Matrix (Wolfenstein parameterization)

Unitarity of CKM Matrix

Unitarity Triangle

|Vcb|=|Vts|

|Vc ｄ | is known with 5% precision

0.224±0.012 Primary objection of Bs mixing:

Precise determination of one side of the Unitarity Triangle

0*** tbtdcbcdubud VVVVVV

)(

1)1(

2/1

)(2/14

23

22

32

O

AiA

A

iA

VVV

VVV

VVV

V

tbts

cbcscd

ubusud

CKM

td

cdts

td

cbcd

td

VV

V

VV

VVtb

1*

*

WHEPP 9 602006/1/6

Analysis Strategy Mixing

(1) Reconstruct Signal Flavor eigenstate

(2) Determine B decay time Decay time reconstruction Lifetime measurement

(3) Identify the initial flavor of B meson Flavor tagging B0 mixing

(4) Bs Mixing “Blind Analysis”

mteN

BBdt

dN

mteN

BBdt

dN

t

t

cos12

cos12

/000

/000

Kaon

WHEPP 9 612006/1/6

Silicon Vertex Trigger (SVT) Level 2: Silicon Vertex Trigger

Use silicon detector information Good IP resolution Trigger on displaced track

beamline reconstruction update every ~ 30 seconds

IP resolution: ~ 50 m 35m beam size + 35m SVT

d = impact parameter

Primary Vertex

Secondary Vertex

BLxy

WHEPP 9 622006/1/6

Hadronic and Semileptonic Reconstruct two different signatures

“Hadronic” = “Exclusive” “Semileptonic” = “Inclusive”

These are different Trigger, signal yield Background Missing momentum Sensitivity for Bs mixing

Hadronic: Less signal yields Good sensitive at higherms

Semileptonic: Higher signal yield good sensitivity at lower ms

These two signatures are treated differently, and the results are combined together.

lss lDB 0

0sB

sD

W

b cd

s

u

s

0sB

sD

W

b cl

s

l

s

“Hadronic”

“Semileptonic”

ss DB0

WHEPP 9 632006/1/6

Signal Yield Summary

Hadronic(S/B) Semileptonic(S/B)

Bs: Ds （ 526±33 (1.8) 4355±94 (3.1)

Bs: Ds （ K*K 254±21 (1.7) 1750±83 (0.4)

Bs: Ds （ 116±18 (1.0) 1573±88 (0.3)

B+: D0 （ K ~6200 ~100K

B0: D*+ （ K “satellite” ~25K

B0: D+ （ K ~5600 ~52K

WHEPP 9 642006/1/6

Flavor Tagging

Current result: Opposite side tag only

Opposite side tagging Use the other B in the event Semileptonic decay (b （ l-)

(1) Muon, (2) Electron

Use jet charge (Qb = -1/3) (3) Jet has 2ndary vertex (4) Jet contains displaced track (5) Highest momentum Jet

Same side tagging Use fragmentation track B0, B+, and Bs are different Kaon around Bs: PID is important

Opposite side B

Reconstructed B

Fragmentation track

Bbu

du

0sBb

s

us K

0sB

K

K

WHEPP 9 652006/1/6

md Summary

World average md=0.510±0.005 ps-1

Total D2: 1.1—1.4% All dilution scale factors consistent with 1

Hadronic: 15~25% uncertainty Semileptonic: 5~15% uncertainty

Hadronic Semileptonic

md (0.503±0.063±0.015) ps-1 (0.498±0.028±0.015) ps-1

Total D2 (1.12±0.23)% (1.43±0.09)%

Dilution scale

Muon 0.83±0.10±0.03 0.93±0.04±0.03

Electron 0.79±0.14±0.04 0.98±0.06±0.03

Vertex 0.78±0.19±0.05 0.97±0.06±0.04

Track 0.76±0.21±0.03 0.90±0.08±0.05

Jets 1.35±0.26±0.02 1.08±0.09±0.09

1st error: statistical2nd error: systematic

WHEPP 9 662006/1/6

Amplitude Scan for B0

Introduce “Amplitude” in Likelihood

Amplitude will be consistent with 1 if there is mixing 0 if there is no mixing

Amplitude scan Fit the amplitude for fixed m

Amplitude: A, uncertainty: A

Repeat the fit with different m

Example for B0 Hadronic sample Amplitude = 1 at m = 0.5 ps-1

Amplitude = 0 at m >> 0.5 ps-1

mtSDAeL ttsig cos1

1 /

Hadronic B0 sample

Hadronic B0 sample

WHEPP 9 672006/1/6

Algorithms for Bs mixing: Status / Improvements

Complex meas.s involving many detector systems and analysis tools Triggering: optimized SVT algorithms Reconstruction modes

Currently adding Bs Ds 3 (x1.5) Will add Bs Ds

* by summer 2006 Currently adding Bs Dsl sample

using SVT 2-track triggers (x2) Tagging (D2)

e, , jet charge (1.5%) Same-side K tagging in progress (~2%)

Decay length resolution Improving vertex resolution by 10~20% for larger ms Implementing into analysis by fall 2005

Reducing systematic uncertainties by fall 2005 Hadronic modes - better calibration in flavor tagging Semileptonic modes - better understanding of backgrounds

WHEPP 9 682006/1/6

Production of the Top quark at the TevatronTop quarks are primarily produced in pairs (~7pb),

via qq (85%) and gg(15%), - LHC via gg (90%)

top ~ 4 x 10 -25 s (due to large mass)

Top decays as free quark (-1 ~ (200MeV) -1 ~10 -23 s)

Dilepton (5%, small background)

2 high-PT leptons(e/), 2 b jets, large missing ET

Lepton+Jet (30%, manageable bgrnd)

1 high-PT lepton(e/), 4 jets (2 b jets), large missing ET(30%)

All-hadronic (44%, large background)

6 jets (44%)

WHEPP 9 692006/1/6

Wbb MCData

tt MC

Datasets

Result Likelihood fit:

Best signal + bkgd templates to fit datawith constraint on background normalization

Likelihoodfit

Massfitter

Signals/background templates

Data

Top Mass Analysis using the template method

2 mass fitter:•Finds top mass that fits event best•One number per event•Additional selection cut on resulting 2

WHEPP 9 702006/1/6

Final State (Lepton+Jet channel): lepton, neutrino plus 4jets

Datasets (Mar, 2002 ~ Aug. 2004) 318pb-1 for High-pt central electron/muon triggers

High pt electron or muon with Pt > 20 GeV Isolated

Electron: EM cluster in calorimeter with matched track

Muon: track matched to hits in muon chambers,

MIP ionizing energy in calorimeter

Large missing Et >20 GeV Leading 4 jets

Reconstructed with cone algorithm (0.4) using calorimeter towers ||<2.0

Event Selection

WHEPP 9 712006/1/6

B-tagging and Sample Division

Top Event Tag Efficiency: 55%False Tag Rate (per jet): 0.5%

Signal/Background improvement

(only 1-2% of W+jets contains heavy flavor)

Big help to remove wrong choice in jet-parton assignment for Mtop

Samples are divided to get the best sensitivity on top mass

Sample #

b-tags

Jet ET cut

[ GeV ]

2-tag 2 3 jets w/ Et>15

4th jet w/ Et > 8

1-tag(L) 1 3 jets ET > 15

4th jet 8 < ET <15

1-tag(T) 1 4 jets ET > 15

0-tag 0 4 jets ET > 21

WHEPP 9 722006/1/6

Jet Energy Correction

Determine true “parton” E from measured jet E in a cone 0.4

Correction to central region using dijet balance: to make response uniform in

Correction to particle jets using dijet MC tuned for single particle E/P, material, and fragmentations: due to non-linear and non-compensating cal.

Out-of-Cone :correction to parton”top-specific correction” to light quark jets and b-jets separately

Non-uniform response

Diff. resp.of /i+-Non-linearity

Shower, frag.

WHEPP 9 732006/1/6

1. Try all jet-parton assignments with kinematic constraints, but assign b-tagged jets to b-partons

2. Select the rec. mass Mt from the choice of lowest 2

3. Badly reconstructed Mt (2 > 9 ) is removed

Top mass isfree parameter

Mass Fitter (event by event)

All jets are allowed to be float according to their resolutions to satisfy that M(W+)=M(W-)=80.4 GeV, M(t)=M(t)

WHEPP 9 742006/1/6

Reconstructed Top Mass Dist. at Mtop = 178 GeV

More correct combination

with b-tag

Mt(GeV/c2) Mt(GeV/c2)

Mt(GeV/c2) Mt(GeV/c2) Bkgd is large in the 0-tag

WHEPP 9 752006/1/6

W+heavy flavor jets(bb,cc,c) Heavy flavor fraction from MC Normalized to data

W+jets(mistag) Use measured mistag rate, applied

to the data Multijet:fake-W (jet->e, track->)

Estimated from data Single top, dibson (WW,WZ)

Estimated from MC

Backgrounds

2tag 1tagT 1tagL 0tag

bkgds 0.7+-0.2 7.6+-1.2 10.2+-1.7 no est

Data 16 57 25 40

>=1-btag

controlsignal

WHEPP 9 762006/1/6

Background templates

0tag: W+jets Tagged: W+HF, Mistag, fake-W, Single-top Shape: mostly by ALPGEN MC, cross-check with data

Mt(GeV) Mt(GeV/)

WHEPP 9 772006/1/6

-Log Likelihoods

0tag1tagL

1tagT2tag

Sensitivity mainly comes from 2tag and 1tagT samples

Sample Expected

sensitivity

0-tag 11%

1-tag(L) 9%

1-tag(T) 45%

2-tag 35%

WHEPP 9 782006/1/6

Mjj templates (true Mtop, JES)

PDFs( Mjj | JES, Mtop= 180 ) :1tagL PDFs ( Mjj | Mtop, JES=0):2tag

Mjj strongly depends on JES,

but independent of Mtop

Mjj

Mto

p

Mjj

Mjj

WHEPP 9 792006/1/6

Mt templates (true Mtop, JES)

PDFs ( Mt | JES, Mtop=180):1tagTPDFs ( Mt | Mtop, Mtop=180):1tagT

Rec Mt

Mto

p

Mt strongly depends on JES and Mtop

Rec Mt

WHEPP 9 802006/1/6

2 7 GeV/c)JESstat(5.31M 7.36.3top

WHEPP 9 812006/1/6

Jet Energy Systematics

A lot of work has been done to reduce the syst. from jet-energy scale (a factor of two improvement compared to last year). The new Run II systematic uncertainties are at the same level or better than Run I.

RunII

RunII 2004

RunI

Frac. Syst. uncert. vs Pt

Central region

WHEPP 9 822006/1/6

Test of the Jet Energy Corrections

Photon+jets, di-jet, Z+jets are used to cross-check the jet energy corrections. Observed differences between data, Pythia, and Herwig are contained by the jet systematic uncertainties in different regions.

0.1

-0.1

0.1

-0.1

40 80 PTPT8040

WHEPP 9 832006/1/6

Searches for SM HiggsSearches for SM Higgs

•CDF search for SM Higgs in several channels :

bblWH WWH

bbZH WWWWH

1st results soon

•NEW updated results from

•Selection:• High pt lepton data (L=319 pb-1)

• One high pt central e or , large MET (MET>20 GeV)

• 2 jets (at least one is tagged as b-jet)

• Veto events w/ >1 lepton (suppress ttbar)

bblWH

WHEPP 9 842006/1/6

3x1

~ 1x1

WHEPP 9 852006/1/6

Run I Results using tracking + calorimeter method

• Using tracking information instead of calorimeter information could improve energy resolution.• A plot below shows the study in Run 1 to improve the energy resolution• Currently CDF is trying a few algorithms to improve.

WHEPP 9 862006/1/6

Neural Net Selection Neural Net:

NN analysis done for ZHllbb 16 input variables

Improves S/√B by factor 1.44 NN cut >0.6

Signal =77.5% Background =15.4%

Mass cut : 10020 GeV: Signal =53.7% Background =15.8%

Equivalent lumi=(S/√B)2=2 1.75 from 2003 HSWG study is achiev

able: Using full shape (instead of cutting) may g

ain even more

WHEPP 9 872006/1/6

WH Signal in ZHbb Analysis This is easy!

Got factor 2.4 now (CDF): S/√B increases: 0.062 => 0.096 Luminosity factor=(S/√B)2=2.4 DØ observe factor 1.6

Remarks: ZHbb analysis:

vetoes against isolated tracks, electrons and muons

Exact factor depends on veto cuts Cross-talk with lepton and track-only sele

ctions can be further optimised with global view

on all analyses

Factor 2.7 of CDF study reasonable

CDF DØ

ZH signal 0.13 0.065

WH signal 0.06 0.018

Background 3.9 2.19

S(ZH)/√B 0.062 0.043

S(ZH+WH)/√B 0.096 0.055

WHEPP 9 882006/1/6

CDF and D0 Detectorsmulti-purpose detectors with: Tracking in magnetic field.

Precision tracking with silicon. Calorimeters. Muon chambers.CDF

D0

Jet ET/ET ~ 84%/ET (GeV/c2)