# Presentation: 524090

## DØ Results for Moriond

**Boaz Klima**
**Fermilab**
**All Experimenters **
**Meeting****                       **
**Mar. 11, 2002**

## Technical Manager  

**Infrastructure**
- A. Jonckheere,
- TBA

*Reco program integration*

**EM ID**
- V. Buescher
- M. Jaffré

**Muon ID**
- J. Butler
- D. Zieminska

**Jet/ME****T**** ID**
- G. Bernardi
- V. Zutshi

**Tau ID**
- D. Chakraborty
- Y. Gerstein

**Technical Manager  **
- J. Kotcher

**Global Systems**
**and Production**
- M. Diesburg,
- I. Bertram, TBA

**Data Access**
**and Databases**
- L. Lueking,
- V. White

**Algorithms**
- H. Melanson

**Software and Computing**
- K.W. Merritt, A. Boehnlein

**b ID**
- F. Filthaut
- R. Van Kooten

**Luminosity**
- M. Begel
- J. Hauptman

**Fwd. Proton**
- G. Alves
- S. Novaes

**Simulation**
- Q. Li,
- S. Protopopescu

**SMT **E. Kajfasz,
- P.Rapidis

**Spokesmen**
- H. Weerts
- J. Womersley

**Speakers Bureau**
- Chair: D. Hedin

**Advisory Council**
- Chair: J. Hobbs

**Institutional Board**
- Chair: S. Hagopian

**SMT**
- Y. Kulik

**Calorimeter/PS**
- L. Sawyer
- A Turcot

**Muon system**
- C. Royon, L. Stutte

**Global Tracking**
- V. Kuznetsov
- H. Greenlee

**Calibration/**
**Alignment**
- G. Gutierrez
- T. Yasuda

**CFT**
- M. Hildreth

**Unpacking**
- (C. Leggett)

**Level 3 filtering**
- M. Souza
- D. Claes

**Fast simulation**
- S. Eno

**Event**
**Generators**
- (S. Protopopescu)

**D0gstar**
- S. Kunori

**Vertexing**
- G. Lima, S. Choi

**Triggermeisters**** **
- L. Babukhadia, E Gallas

**CFT **D. Lincoln

**CPS **D. Alton

**FPS **S. Chopra,
- A. Patwa

**Calorimeter**
- U. Bassler,
- N. Parua

**ICD** A. Stone,
- A. White

**Cen Muon **T. Diehl

**Fwd Muon **(D. Denisov)

**Solenoid **R. Smith

**Lum Mon**
- G. Guerkov,
- R. Partridge

**DAQ **
- S.Mattingly

**Online**
- S. Fuess,
- P. Slattery

**Trigger**
- G. Blazey,
- N. Varelas

**FPD **
- A. Brandt

**Operations**
**Run Coordinator: **D. Denisov

**Trigger Board**
- Chairs: D. Wood,
- L. Groer

**Offline**
**Resources Board**
- Chair: N. Hadley

**Physics**
**Coordinator**
- B. Klima

**Jet Energy Scale**
- A. Goussiou
- R. Kehoe

**Silicon**
- M. Demarteau
- A. Bean (Deputy)

**Run 2B Project**
- (J. Kotcher, Proj. Mgr.)
- R. Partridge (Deputy)
- M. Johnson (Tech. Coord.)
**Project Office**
- W. Freeman

**Detector Commissioning**
- L. Groer
**Electrical Operations: **R. Hance
**Mechanical Operations: **
- R. Rucinski

**B Physics**
- B. Abbott
- H. Evans

**New Phenomena**
- L. Duflot
- G. Landsberg

**QCD**
- J. Krane
- M. Zielinski

**Top**
- E. Barberis
- C. Gerber

**WZ**
- T. Diehl
- G. Steinbrueck

**Higgs**
- J. Hobbs
- M. Narain

**Online**
- S. Fuess
- P.Slattery

**Level 3**
- G. Blazey
- P. Padley

**Level 2**
- R. Hirosky
- J. Linnemann

**Level 1**
- H. Evans
- D. Wood

**Installation &**
**Infrastructure**
- (J. Kotcher)

**Online**
- S. Fuess
- P. Slattery

**Trigger Simulation**
- D. O’Neil, S.Protopopescu

- Boaz Klima

- All Exp. Meeting - 3/11/02

##                        Bottom Line

- Results from Run 2 shown for the first time at conferences
- Almost all detectors are operational
- Most of those produce data as (or close to what’s) expected
- In most cases we understand what needs to be studied/done/developed to get us to the “promised land”
**Everything is (really!) Preliminary**
- We are on the way to producing exciting physics

- Boaz Klima

- All Exp. Meeting - 3/11/02

##                      Luminosity

-      Projected luminosity

-   Luminosity to-date

**Tevatron**

- Boaz Klima

- All Exp. Meeting - 3/11/02

##       On the way to QCD physics

**  **2-jet event
** ****E****T****jet1 ****~ 230GeV**
** ****E****T****jet2 ****~ 190GeV**

-      Single Jet PT

**  **3-jet event
** ****E****T****jet1 ****~ 310 GeV**
** ****E****T****jet2 ****~ 240 GeV**
** ****E****T****jet3 ****~ 110 GeV**
** ****E****T****mis****  ****~    8 GeV**

-  Plots obtained with < 1 pb-1 (not normalized with L)
-  No trigger efficiency correction applied
-  Preliminary (v1) energy corrections

-     Dijet Invariant Mass

-       **On the way to QCD physics**

- Boaz Klima

- All Exp. Meeting - 3/11/02

##      On the way to W/Z/Top/Higgs physics

- Z  e+e-

- Only Central Calorimeter
- electrons

- Mee=93.2 GeV
- Each electron has calorimeter energy and global track (SMT+CFT)

- Boaz Klima

- All Exp. Meeting - 3/11/02

##       On the way to W/Top/Higgs physics

- W e

**Events**

**M****T**** (GeV/c****2****)**

******vents**

- Signal

- background

- With matching of track and cal cluster
- Purity ~ 90 % (~350 signal events)

- Without track matching
- Purity ~ 25 % (~900 signal events)

- Boaz Klima

- All Exp. Meeting - 3/11/02

##             W+4 jets Candidates

| e1 | j1 | j2 | j3 | j4 |
| --- | --- | --- | --- | --- |
| ET = 99 GeV
 = -0.53
 = 5.94
Low-pT track match | ET = 68 GeV
 = 1.62
 = 6.03 | ET = 57 GeV
 = 0.69
 = 3.38
 | ET = 35 GeV
 = 1.27
 = 2.29 | ET =  26 GeV
 = 1.83
 = 2.90
 |
| MET = 62 GeV, MT(EM-MET) = 156 GeV |  |  |  |  |

-  Electron

- ET

- j1

- j2

- j3

- j4

| e1 | j1 | j2 | j3 | j4 |
| --- | --- | --- | --- | --- |
| ET = 52 GeV
 = -0.51
 = 1.63
Low-pT track match | ET = 28 GeV
 = 0.73
 = 3.82 | ET = 24 GeV
 = 2.41
 = 1.62
 | ET = 21 GeV
 = 0.52
 = 5.80 | ET =  20 GeV
 = -1.43
 = 4.60
 |
| MET = 30 GeV, MT(EM-MET) = 79 GeV |  |  |  |  |

- Electron

- ET

- j1

- j2

- j3

- j4

- Boaz Klima

- All Exp. Meeting - 3/11/02

##        Z       Candidate Event

-               2 matched tracks (CTF only); Invariant Mass = 103GeV

- Z  +-

- Boaz Klima

- All Exp. Meeting - 3/11/02

##         W      Candidate Event

- PT=37 GeV
-  Charge = -1
-  No reconstructed jet in Cal
-  Cal confirmation 3x3 = 2.6GeV
-  11 hit SMT+CFT global track
-  DCA = 50 microns
-  Transverse Mass = 78 GeV

- W-  -

- Boaz Klima

- All Exp. Meeting - 3/11/02

##        On the way to B physics ...

- Ks +-

- _Method:_
-  Select primary vertices
-  Find all 2 tracks combs
-  Select Ks sec. vertices
-     (SMT only tracking)

-  Displaced vertices

- J

-  triggers (Central+Forward)
- Muon System only Tracking

- Mean = 3.08 ± 0.04 GeV
- Sigma = 0.78 ± 0.08 GeV

-       SMT only Tracking

- Boaz Klima

- All Exp. Meeting - 3/11/02

##          On the way to B physics

- in jets

- Cross Section

- PT rel distribution

-   pT**rel**** dist. consistent with Run 1 data**

-   **Run 1 fit**

- Boaz Klima

- All Exp. Meeting - 3/11/02

##   On the way to New Phenomena physics

- +ET Channel

- +ET is an important channel for new physics searches (GMSB SUSY, radiative neutralino decays, extra dimensions, etc)
- The key is a good ET resolution and small non-Gaussian tails
******(E****T****)~7GeV**

-  Using a likelihood quantity, the “MET significance” improves S/B by taking into account event topology, found vertices, and resolutions

- Boaz Klima

- All Exp. Meeting - 3/11/02

##   On the way to New Phenomena physics

- D**** Run 2 Preliminary

- EM1

- EM2

- j1

- j2

-   **On the way to New Phenomena physics**

- First generation LQ
- (2 electrons + 2 jets)

- Kinematic cuts: 2 EM objects with ET > 25 GeV and  more than 2 jets with ET > 20 GeV
- ST = scalar sum of transverse energies of electrons and jets to separate signal and background
** **Most energetic event has ST = 315 GeV

- 5 candidate events,one with a track match

**6pb****-1**

- Boaz Klima

- All Exp. Meeting - 3/11/02

##   On the way to New Phenomena physics

| e1 | e2 | e3 |
| --- | --- | --- |
| pT(cal) = 17.9G
pT(CFT) = 0.52
 = 0.43
 = 5.42
charge = +1 | pT (cal) = 13.9
pT (SMT) = 10.9
 = -1.94
 = 2.8
charge = +1 | pT (cal) =  13.2
pT (CFT) = 15.1
 = 1.06 
 = 5.72
charge = -1 |
| me1e2 = 55.7 | me1e3 = 10.8 | me2e3 = 63.5 |
| me1e2e3 = 85.2  GeV            MET =10.9 GeV |  |  |

- eee candidate event

- eμμ candidate event

- SUSY
- (Trilepton search)

- Boaz Klima

- All Exp. Meeting - 3/11/02

##                      Outlook

- The Tevatron Run 2 started in March 2001, offering one of the most exciting physics programs for the next decade.
- Enormous progress made over the course of the last year in terms of detector commissioning. Entering physics results phase.
- Integrated luminosity delivered so far ~20 pb-1.                                                    Expect ~300 pb-1 by the end of 2002.
- Preliminary performance results are encouraging and indicate that the upgraded DØ detector will be able to fully exploit the available physics opportunities.
- First physics results already emerging: J/, W, Z, jet distributions, etc. It will get even better:
- optimization of detector, trigger and DAQ performances,
-     calibration,alignment,...
- improved selection and reconstruction procedures,...
- and lots of integrated luminosity!
**Expect a lot more for the Summer Conferences!!!**

**                     ****Outlook**

- Boaz Klima

- All Exp. Meeting - 3/11/02