The CDF Group at LBNL

Outline

Past Contributions

Present members of the group

Activities in B physics

Activities in High PT physics

Summary and Conclusions

Expected Tev luminosity to FY'09

CDFII Detector

LBNL contribution on:

silicon detector and

COT tracker

Contributions since 1981

Joined in 1981 (Bill Carithers)

Run 0: plug hadron calorimeter, DAQ electronics

Run I: Front end electronics for the silicon detector

This opened a new era in hadron collider physics

Very important for the top discovery.

LBL had major contributions to the software, data

analysis and the writing of the top evidence and

discovery papers

Several precision measurement of b hadron properties

Also: Major contributions to first CDF precision W

mass measurement.

LBNL Contributions to CDF II (1)

I. Construction

Silicon detectors

SVX3 chip (co-design with FNAL), test, probe

hybrids for L00, SVXII, ISL

associated electronics

Drift Chamber (COT)

inner cylinder, field sheets

Conceptual design of alignment

Time calibration system

II. Commissioning

COT Associate Project Manager

COT Commissioning

Silicon commissioning

III. Operation

CDF II Operation Manager

SVT operation

Silicon Operation

IV. Computing and software

Project manager

Codegen for relational data bases

Data handling software for early tests

Silicon Code librarians

TOF

Study laser calibration system

Install fibers, online monitoring

Silicon Detectors:LBNL Contributions

SVX’

1990

SVX2

1996

SVX3

1998

SVX4

2002

LBNL designed SVX, SVX'.

Joint designs with FNAL since.

SVX3 used in CDFII RUN 2b R&D and prototyping

SVX4: developed for Run 2b Project canceled due to budget cut. Chip used by D0, Phenix at BNL

Conversion to .25 micron CMOS technology proposed by LBNL. Also used by ATLAS' pixel chip

Hybrids and “stave” (new detector concept : integrated electrical, mechanical and cooling unit) being evaluated by ATLAS

Silicon detectors transformed physics capabilities of CDF since early '90.

LBNL is a major player in Vertex Detector technology. Long standing tradition, now extended to LHC.

SVT, displaced vertex trigger

Extended B physics capability

Rad hard chips for Silicon Detectors

Silicon detectors transformed physics capabilities of CDF since early '90.

LBNL is a major player in Vertex Detector technology. Long standing

tradition, now extended to LHC.

LBNL Contributions to CDF II (2)

LBNL Recent Contributions to CDFII

8

LBNL Recent Contributions to CDFII

Silicon good run list (P. Lujan)

SCI-Co or CO shifts (everybody)

moved to other groups

Online silicon monitoring (to John's Hopkins)

Silicon calibration ( Nielsen)

Online data monitoring (YMON) (to Rochester)

COT calibration (to FNAL)

SVT data taking: pager (to Pisa)

SVT online monitoring checks, SVT hardware support, upgrade code consultant (A. Cerri)

DAQ shifts (3 months service)

Detector Operation (MOU)

GFLASH tuning (P. Fernandez) (just ompleted) moved to other groups

MC generators : ISAJET (Galtieri), HERWIG, Wbbgen (Lys), ZGRAD (Gibson)

Silicon geometry (A. Dominguez)

Passive material (L. Vacavant)

Silicon Tracking (W. Yao)

Secondary vertices code (W. Yao, A. Dominguez)

SVT simulation (A. Cerri)

MC: EVTGEN, B decays generator (J. Beringer)

Software Responsibilities (MOU)

Jet Corrections and systematics

Pedro Fernandez, L. Galtieri + others

NIM A566, 375 (2006)

Long standing expertise on jets in LBNL group

Run2 systematic uncertainties (published in NIM ) are now smaller than Run1.

Recent calorimeter simulation tuning (P. Fernandez)

Special trigger provided large samples of isolated tracks to 40 GeV/c (from 5 GeV/c)

Lateral and longitudinal tuning of central and plug calorimeters almost finished

Plug tuning helped reduce W mass systematic uncertainty

Expect to reduce jet energy systematics by at least 30%

Central , before tuning

Plug , before tuning

after tuning

Members of the LBNL Group

Physicists-Staff (1.8 FTE)

A. Galtieri

B. Heineman* (UC Berkeley)

J. Beringer**,*

C. Haber*

C-J Lin***,** (joined 9/'07)

J. Lys *

M. Shapiro* (UC Berkeley)

J. Siegrist* (UC Berkeley)

W. Yao**,*

Physicists-Term (3 FTE)

P. M. Fernandez (FNAL, 11/07)

Grad. Students(2.5FTE)

A. Deisher

H-C. Fang

P. Lujan

J. Freeman (FNAL,11/07)

J. Muelmenstaedt (UCSD, 1/08)

*ATLAS, ** PDG ***Daya Bay

FTE refer to FY08 (mostly part time staff physicists or students)

Guest

I. Volobouev (Texas Tech)

J. Nielsen (UCSC)

In 2003 DOE's directive was to move

all the CDF effort into ATLAS. This is now almost accomplished

B physics recent contributions

Bs mixing observed (CDF summer 2006)

Oscillations Period

Agrees with SM

prediction:

no New Physics

Several LBNL contributions to the Bs mixing analysis.

Present work

(three PHD thesis):

Bs lifetime

Angle  inputs: Cabibbo- suppressed modes

The latter analysis is completed, paper is being written

Unitarity triangle as of LP'07

B­D0K¯

BsDs¯K+

Measurement of the Bs Lifetime

Amanda Deisher (PHD Thesis), with A. Cerri, H.-C. Fang, J. Muelmenstad, M. Shapiro

Motivation:

Reduce the experimental error on  (Bs) / (B0)

PDG  (Bs) = 1.466 ± 0.059 ps

CDF II Hadronic  (Bs) = 1.60 ± 0.10 ± 0.02 ps

Method (NEW!):

Use fully and partially reconstructed hadronic modes.

Results:

Preliminary results on B0 control samples:

Will fit signal sample Bs->Ds(ϕπ) π soon!

Expected uncertainty ~ 0.05 ps

0.844 + 0.043

0.914 + 0.030

1.076 + 0.008

Exp.

0.90 + 0.04

1.00 + 0.01

1.06 + 0.02

Theory

(Λb) /  (B0)

(Bs) /  (B0)

(B+) /  (B0)

PR

x 2 statistics

Control Sample: B0D*- π+

458.7±2.7μm

PDG

491.1±3.3μm

Cabibbo-suppressed B-D0K-

The Gronau-London-Wyler method* exploits the phase difference of δ+γ between the B– amplitudes

to extract the CKM angle γ with measurements of

We can measure R and A for flavor (D0  K-π+) and CP+ (D0  K -K+ / π -π+) modes

Use maximum likelihood fit in mass and particle ID (dE/dx) to extract relative branching ratios

Two control samples: B0  D*-K+ and B0  D -K+

(very preliminary)

Expect approval from collaboration in ~2 months

Use 1.3 fb-1 of integrated luminosity –

statistics comparable to BaBar (2006)† and Belle (2006)‡

Hung-Chung Fang(PHD Thesis), with A. Cerri, A. D asher, J. Muelmenstad, M.D. Shapiro

*PRD 58 037301,**PRL 96 011803, ***PRL 87 111801,

†PRD 73 051105, ‡hep-ex/0601032

B0D-K+ control sample fit

dE/dx projection in DK mass region

Johannes

Rare B decays: Bs→ mm

Br(Bs)<5.8×10-8 @ 95% CL

Br(Bd)<1.8×10-8 @ 95%CL

CDF analysis:

Can distinguish Bs from Bd➙

Using Neural Net to extract signal

Improve sensitivity by including NN

output and M in limit calculation

Find:

Bs window → 3 events

Bd window → 6 events

No significant excess !

Cheng Ju Stephen Lin + others

High PT Physics

Present involvement:

SUSY Searches

Top mass precision measurement

Higgs Searches

Several papers being prepared for publication

SUSY Searches: chargino-neutralino

0

0.8 ± 0.4

e+ll

1

1.2 ± 0.2

µ+ll

3

1.0 ± 0.3

ee+ track

1

0.4 ± 0.1

µµ+l (low pt)

DATA

SM expect.

trileptons

DATA

SM expect.

LS leptons

1

0.9 ± 0.1

µµ

8

4.0 ± 0.6

eµ

4

2.9 ± 0.5

ee

1 fb-1

Beate Heinemann with others

Limit =125 GeV/c2

New top mass measurement

J. Freeman (PHD Thesis), L. Galtieri, P. Lujan, J. Lys, P. M. Fernandez (LBNL),

J. Nielsen (UCSC), I. Volobouev (Texas Tech)

Measurement with 1.7 fb-1 (293 events passing all cuts):

Best individual top mass measurement to date!

The LBNLmethod uses a matrix element integration to calculate a 2-D likelihood as a function of top mass and jet energy scale (JES).

It includes “effective propagators” which compensate for the assumptions we make in order to make our integration computationally tractable.

It will reduce the uncertainty on the average top mass value and, and change the central value as well.

NEW

mt = 172.7 ± 2.1 (stat. + syst.) GeV/c2

Top mass and Higgs in the SM

The Standard Model predicts the Higgs mass, once the W and Top mass are measured with high precision.

Loop corrections to MW proportional to Mt2 or ln( MH)

Winter 2007 World average:

M(top) = 170.9 ± 1.8 GeV/c2 (CDF+D0 Run I+II)

July 2007 best Fit

M H = 76 GeV/c2

July '06:

M H = 85 GeV/c2

now

MH< 144 GeV/c2

at 95% CL

Direct limit:

MH > 114 GeV/c2

at 95% CL

+33

-24

+39

-28

Run II

2009

Direct Higgs search: WH → lbb

Sensitive channel for low mass Higgs

Signature: W + 2 jets (both b-tagged)

Dominant backgrounds: W + jets and top

Search Strategy

Two tag categories: SECVTX + (SECVTX or JP)

Use kinematic information in neural network

Search for excess consistent with SM Higgs

New for this update

Jet probability to increase double-tag acceptance  25% improvement

Kinematic information in NN 10% improvement

Limit (115 GeV)

Obs: 1.31 pb (10.0xSM)

Exp: 1.33 pb (10.1xSM)

Neural Network output

Weiming Yao, Tsukuba Students and others

Higgs Search in ZH, Z->l+l-, H->bb

Beate Heinemann with others

Tevatron Higgs results

Weiming Yao et al. : Higgs Tevatron averaging group

(all channels included)

expected

CDF Higgs expectation

Beate Heinemann, co-chair Higgs Trigger Task Force

Other improvements

Factor 1.5 achievable from:

25% b-tagging (NN-based)

25% trigger acceptance

(pre-existing triggers)

20% better analyses techn.

and better usage of MET

10% Tau channels (hadronic)

Other work in progress:

Additional triggers (HTTF +

L2 Cal upgrade)

High PT b-tagging triggers

Better bb mass resolution

Add forward Tracking

Higgs expectation ( P5 presentation)

7.0 pb-1

5.5 pb-1

CDF+D0 combined

CDF results+ expectation

Contributions from B. Heinemann, W. Yao

Summary and Conclusions

Large contributions to hardware and physics over the last 25 years Trained 17 students (PHD theses), 21 postdocs. 21 of these have faculty or lab staff positions.

Contributed to top discovery, precision top and W mass measurements, particle searches, properties of B mesons, Bs mixing

LBNL still contributing to Run II CDF physics results:

CKM Parameters

Top Physics

Higgs and new particle searches

We will continue helping CDF with our expertise, especially the Higgs search.

Our expertise and successes in CDF are the legacy we bring into ATLAS.

CDF LBNL group

Back-up slides

Supersymmetry

CDF SUSY Search

2002-04-21T14:25:46