May 2004G. Punzi, INFN-Pisa 1 CDF: Stato dell’analisi Stato generale dell’analisi a CDF ...

May 2004 G. Punzi, INFN-Pisa

1

CDF: Stato dell’analisi

Stato generale dell’analisi a CDF Top/EWK physics highlightsb/c physics

SOMMARIOINFN - Riunione della

CSN 1

Roma

17 Maggio 2004

Giovanni PunziSNS/INFN-Pisa


2

CDFII data analysis

Data set500 pb-1 delivered, 400 pb-1 on tape, ~300 pb-1 good Most analyses use (Feb 02 – Sep 03) ~200pb-1 (2*RunI)

Much progress since last report in Sep 03Reconstruction software improvementsThe flow of physics results has begun - many recent blessing Italian group is giving key contributionsWill cover only highlights with emphasis on Italian work

Top quark

EWK

B physics


3

Italian group contributions

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

BdK*, BK (ACP, BR), D0hh (BR, ACP), D+πππ, pentaquark search 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

Responsibilities: Conveners of B and top physics group & subgroups Important committees (e.g. Bs mixing) Interal referees for various analyses (“godparents”)

Contributions to crucial analysis tools Most work in close cooperation amongst Italian groups A lot of work in close cooperation with non-Italian group


4

Basic tools: tracking

Great progress in Si stand-alone Substantial efficiency improvement at

large and low-pt Improved mass resolution L00 now ready for physics:

eff. 60% and growing

Clear improvement in (Lxy),crucial

for Bs mixing

NEW


5

Improved TOF t0 (reduce tails) Improved COT dEdx ->separation Silicon dEdx starting up

K TOF: >1 K/π separation up to p=2 GeV

Basic tools: PID

1.5 GeV/c

dE/dx in COTK/π sep. >1.4@Pt>2GeV (was 1.2)

pK

dEdx in Silicon Vertex for low-pt tracksPLAN: combine them all !


6

CDFII Physics Results

5 Low-Pt papers produced Charm cross-section, Ds-D+ mass, D0->µµ, Bs->µµ, X(3872)

First High-Pt paper submitted 27/4 t-tbar cross section from dileptons

23 paper drafts currently under review 6 Low-Pt 4 EWK 6 Top 5 Exotics 2 QCD

A long list of blessed results going through internal review Many more papers will be drafted in upcoming months


7

Hi-Pt


8

1st Run II top paper:

Top-> dileptons

channelExpected

(scaled to 13 total obsv’d)

Observed RUNI

ee 3.3 ± 0.5 1 1

2.8 ± 0.5 3 1

e 6.8 ± 0.8 9 7

= 7.0+2.4-2.1(stat) +1.6

-1.1(sys) 0.4 (lumi) pb

(hep-ex/0404036)

Flavor distributionconsistent with SM expectation


9

Top mass: l + jets

Choose events with 4 jets, 1 vertex tag

28 events in 162 pb-1 with estimated bckg of 7.0 ± 0.8

Syst. uncertainty dominated by jet-energy scale.

Best determination from DLM:

mt = 177.8 +4.5-5.0 (stat) ± 6.2 (sys) GeV


10

Run II Top Summaries

Top Mass

Optimizing the mass scale. Will follow cross sections

PRL submitted04/27/04

PRD draft in preparation




PRL Combination


11

W,Z Summary

(W,Z)From the ratio:W = 2071 40 (MeV/c2)

CDF II (e)1.1<||<2.8

First-time use ofForward regionthanks to SVX+ISLStandalone tracking


12

Search for Hi-mass dileptons

M(Z’) >750 GeV(RunI > 690 GeV)


13

Low-Pt


14

1.9 10-77.5 10-7BR limit @95% C.L.

1.5 10-75.8 10-7BR limit @90% C.L.

1.07±0.311.05±0.30Background

11Data

Bd +-Bs +-

Best world result for

Bs(improves CDF Run I

x3)Slightly better results than Belle and BaBar for Bd

1.6 10-7 2.0 10-7

Rare decays: Bd(s)

Muon Pt>1.5-3.0 GeV, |eta|<0.6 “Blind” analysis: cuts optimized before looking at the signal region

1 event in the overlap region


15

Bs implications for SUSY

R. Arnowitt et al.,PLB 538 (2002) 121,new plot by B.DuttaR-parity violating

R. Dermisek et al., hep-ph/0304101

7.510-7

SO(10)

New limit excludes significant significant amounts of the previously allowed SUSY models parameters - Expect ~10-7 with 1fb-1

16

BVV Polarization and lifetimes

BdJ/K*, BsJ/ Systematics to O(1m)

Going towards s

BdJ/K*

|A0|2 = 0.63 0.04 0.03; || : 3.07 0.40

|A|2 = 0.18 0.05 0.05; : 0.11 0.23

|A0|2 = 0.59 0.07 0.03

|A|2 = 0.23 0.10 0.01World bestBs

Bd

cBu = 498.19.9(stat)2.4(syst)cBd = 461.315.4(stat)2.4(syst)cBs = 410.430.0(stat)+2.4 -2.9(syst)Bu/Bd = 1.080 0.042Bs/Bd = 0.890 0.072

BsJ/

Competitive with PDG


17

Hadronic decays:Charm & more Charm

CDF is publishing the World’s best BR &ACP measurement in D0 decays

Now going for BR and ACP of D+->πππ - No experiment ever had >1500 ev BR known at 10% will become 1% Unique possibility to see ACP in Charm

55,000 events !

~190 pb-1

A(D0 KK) = 2.0 ± 1.2± 0.6 %A(D0 )= 1.0 ± 1.2 ± 0.6 %

syst


18

Updating B->hh BR& direct ACP

Substantial yields in 180pb-1 Bd yields = 80fb-1 Babar

RAW yields for the moment Update of LP03 result at ICHEP04

separated by dEdx+kinematics

Direct Acp(Kπ) to 7% (Babar 5%@same yield) BR(BsKK) to 15% -> Constraints CKM (angle )

Largest fully reconstructed Bs sample, CP eigenstate s

Bd = 160 27

BdK = 542 30BsKK = 225 29BsK = 28 25

ACP(BdK) = -0.08 0.07


19

B+ K+

Pure-penguin, b->sss decaySensitive to Vts and NPBR & direct-ACP (180pb-1)

ACP

BR


20

First Observation of Bs

Another B->sss penguin processQCDF expectation: 3.68 10-5

Good S/B !

5 significance

Blind analysis, optimized according to physics/0308063With more statistics, can get larger yields by looser cutsFUTURE: Angular analysis (yields a measurement)


21

Welcome back Bd mixing

xd Compatible with expectation. Same Side Tagging only


22

B Flavor Tagging

OST (opposite side tagging): B’s produced in pairs tag flavor of opposite B

JETQ: sign of the weighted average charge of opposite B-JetSLT: sign of soft lepton from decay of opposite B

SST (same side tagging):B0 (B0) is likely to be accompanied by a + ()Search for the track with minimum PT

REL

Kaon taggers (new in CDF):OST (K from bcs transition) SST (K from fragmentation)

N/A in progressSame side kaon

2.2 1.30.4 0.02 *Jet charge

N/A in progressOpp. side kaon

2.1 0.51.0 0.5Same Side

e+µ 2.10.5 in progressSoft electron

0.7 0.2Soft muon

CDF-I CDF-IID2 [%]

•Evaluation in progress, expectations between 5-10%•Learning process in runII no faster than runI... *simpler algorithm


23

Hadronic Yields for Bs mixing

Currently ~1.5pb of hadronic + ~1pb needing reflection cleanup

Need 2pb and D2 = 5% for 5 sensitivity up to 24ps-1 in 3.2 fb-1 - xs is the most complex of all

B measurement - Need to combine many ingredients- Ad-hoc coordination (1/2 italian)- Italy is on the front line

BR paper draft


24

A final noteWhat it is like to produce physics in this environment ? More refined and complex analysis than in run I

Large samples, O(106) events (hadronic triggers) and need to keep up with software revisions/conference deadlines

Large CPU usage, with peaksLarge skimmed subsamples on disk

Blind analysis - Complex, multidimensional cut optimization Precision measurements, small systematics large control samples

realistic MC: simulate detector/trigger conditions vs timeReal data calibrations, e.g. dEdx (fit 103 parameters on 106 events)

Some analysis had smaller signal samples - but still need huge calibrations samples -> requirements are not different

Many analyses at the same time It was all possible only thanks to italian-specific resources

“Generic” users need weeks to run through data samples

It is working, and we would like to keep it that way


25

Backup


26

Pentaquark Searches at CDF

(Fit excludes signal region)

pK0S invariant mass spectrum


27

All-hadronic top

Counting method Kinematic selection + 1b- tag Observe:

326 on 264±17 background

= 7.8 ± 2.5 (stat) +4.7-2.3 (syst) pb


28

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

W+jets production


29

The Bc, rediscovered…

CDF Run1(muon)8.4 (electron)12.0

background above signals 20.42.72.4

3.83.2

6.25.5

+−

+−

+−


30

B to h+h'- future measurements •BsK BR/Acp measurement•Limits on Bs, BdKK•Lifetime in BsKK : s

•ACP in Bd,BsKK

Bs+Bd BRs’ alone provide, via U-spin simmetry, informations of (R. Fleischer

hep-ph/0306270) and checks of CKM model (Matias&London, hep-ph/0404009)

Longer time-scale: time dependent ACP in BsKK

measure independently of penguin pollution (Fleischer and Matias: PRD669 (2002) 054009)

hep-ph/0404009BsKK

Bd

31

BVV Polarization Amplitudes

BdJ/K*, BsJ/ Prerequisite for s

Test of factorization hypothesis

BsJ/

BdJ/K*

|A0|2 = 0.63 0.04 0.03; || : 3.07 0.40

|A|2 = 0.18 0.05 0.05; : 0.11 0.23

|A0|2 = 0.59 0.07 0.03

|A|2 = 0.23 0.10 0.01

World best resultsBs

Bd

May 2004G. Punzi, INFN-Pisa 1 CDF: Stato dell’analisi Stato generale dell’analisi a CDF ...

Documents

Transcript of May 2004G. Punzi, INFN-Pisa 1 CDF: Stato dell’analisi Stato generale dell’analisi a CDF ...