# Presentation: 649284

## Status of the DØ Physics Effort

**Boaz Klima**
**Fermilab**
**Collaboration Meeting****                       **
**Sept. 14, 2001**

## Thanks, disclaimer, WWW etc

- Thanks to all convenors & chairs for their work and help in assembling this talk
- All mistakes are mine!
- More info, being updated on a regular basis, can be found linked from each group/board web page(s) – all linked from the Physics page at
- _[http://www-d0.fnal.gov/Run2Physics/home.html](http://www-d0.fnal.gov/Run2Physics/home.html)_
- This talk is linked from the same page, or go directly to
**http://www-d0.fnal.gov/Run2Physics/d0_private/talks/Collaboration_Meeting_091401.pdf**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Run 1 as productive as ever

- Jianming’s Report
- DØ has published (or submitted) 113 papers so far
- 3-4 were submitted since the last collaboration meeting
- ~12 more papers are expected to be submitted (in 2001?)

- Boaz Klima

- Collab. Meeting - 9/14/01

## DØ Physics Plan

- Long Term
**Healthy program for many years**
- Short Term
**Moriond (followed by Summer 2002 conf’s)**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Technical Manager  

**Infrastructure**
- A. Jonckheere,
- S. Hagopian

*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. Gershtein

**Technical Manager  **
- J. Kotcher

**Global Systems**
**and Production**
- M. Diesburg,

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

**Algorithms**
- A. Boehnlein, H. Melanson, (H. Schellman)

**Software and Computing**
- K.W. Merritt, H. Schellman

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

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

**Fwd. Proton**
- G. Alves
- M. Martens

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

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

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

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

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

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

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

**SMT**
- E. Barberis

**Calorimeter/PS**
- L. Sawyer

**Muon system**
- C. Royon

**Global Tracking**
- TBD
- H. Greenlee

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

**CFT**
- M. Hildreth

**Unpacking**
- (C. Leggett)

**Level 3 filtering**
- (A. Boehnlein)
- 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

**Run 2A**
**Project**
- M. Tuts
- (H. Weerts)

**Silicon**
- M. Demarteau
- TBA (Deputy)

**Front Ends,**
**Trigger, DAQ**

**Run 2B**
- (J. Kotcher)
- R. Partridge
- (Deputy)
**Project Office**
- W. Freeman

**Mechanical**
- W. Cooper

**Sensors**

**Electronics**

**Production**

**Testing**

**Detector Commissioning**
- M. Begel, L. Groer
**Electrical Operations: **R. Hance
**Mechanical Operations: **
- R. Rucinski
**Technical Supervisor:** D. Miller

**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

- Boaz Klima

- Collab. Meeting - 9/14/01

## Spokesmen

**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. Gershtein

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

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

**Fwd. Proton**
- G. Alves
- M. Martens

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

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

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

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

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

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

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

**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

- Integration of
- Reconstruction program
- and Level 3 filters
- together with Algorithms groups

- Boaz Klima

- Collab. Meeting - 9/14/01

## Joint CDF/DØ

- Tevatron Physics
- Working Groups

**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

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

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

**Fwd. Proton**
- G. Alves
- M. Martens

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

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

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

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

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

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

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

**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

- Integration of
- Reconstruction program
- and Level 3 filters
- together with Algorithms groups

**B Physics**

**New**
**Phenomena**

**QCD**

**Top**

**Electroweak**

**Higgs**

**Associate Director for Research**
- M. Shaevitz

- CDF

- Boaz Klima

- Collab. Meeting - 9/14/01

## 

Boards

- Boards

- Boaz Klima

- Collab. Meeting - 9/14/01

## Trigger Board (TB)

- Education & Techniques
- Trigsim (Dugan O’Niel)
- Selecting/examining trigger terms offline (Suyong Choi)
- Trigger Database (Elizabeth Gallas)
- Presentations of studies of triggered data
- Forward muons (Rob McCrosky)
- Level 1 Hadronic veto (Bob Kehoe, Ia Iashvili)
- Central muons (Tom Diehl)
- Policy and planning
- Trigger naming convention
- Running level 3 filters (currently under discussion)
- Future full-capability trigger list (upcoming discussions)

- Boaz Klima

- Collab. Meeting - 9/14/01

## Trigger Board  (cont.)

- Approved new global trigger list, Global-L1CalMuon-1.4.  Includes serveral triggers which run **unprescaled** at all lumniosities
- single EM trigger (20 GeV)
- Di-EM trigger
- Di-Muon trigger (forward)
- Muon+jet trigger (central)
- High-pt Jet trigger
**The trigger board wants more feedback; are triggers getting us the events we need for commissioning and physics tune-up?**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Offline Resources Board (ORB)

- Charge: Allocate Offline Computing Resources
- Priorities for MC generation on Offsite Farms
- Priorities for Processing on Fnal Production Farm
- Priorities for batch queues on D0mino
- Priorities for Project Disk Allocation
- Priorities for SAM storage and data retrieval
- Priorities for Linux Analysis Clusters
- Etc...
**Please send requests in these areas to the ORB**
- Members
- Nick Hadley (chair), Iain Bertram, Mike Diesburg, Uli Heintz,Lee Lueking, Roger Moore, Thomas Nunnemann, Sherry Towers,
- + Physics group reps: B Physics - Bill Lee,  Higgs - Neeti Parashar, New Phenomena - Andy White,  QCD - Iain Bertram, Top - Dhiman Chakraborty,  WZ - Andrew Askew
- +  (ex officio) Boaz Klima, Amber Boehnlein, Wyatt Merritt

- Boaz Klima

- Collab. Meeting - 9/14/01

## ORB - Recent Activities

- Survey of Available resources
- See ORB web page and meeting minutes www-d0.fnal.gov/Run2Physics/orb/d0_private/orb_home.html
- D0mino Disk Plan approved!
- Although cost of disk has dropped, disk space is still limited
- Two stages
- First Stage – all Physics, ID, Detector groups get some additional disk
- Second Stage – ORB carefully considers requests from Physics, ID, Detector and other groups and allocates remaining disk
- See Minutes of Sept 15 ORB meeting  for details
- Plan for User disk purchases in progress

- Boaz Klima

- Collab. Meeting - 9/14/01

## 

Id Groups

- Id Groups

- Boaz Klima

- Collab. Meeting - 9/14/01

## Luminosity Id

** ****Short term plans**
** ****Sept. 15, 2001**** - **provide approximate delivered luminosity (and error) for every run and/or store in an automated way and in a timely fashion. This info should be easily accessible to the collaboration.  We imagine this would use the information currently sent to ACNET
-  **Nov. 1, 2001** - provide a tool for users to get approximate live luminosity (and error) for a given trigger in a given run (or run range)
-  Work done so far on detector hardware and software, monitoring and online tools
-  There is a clear need for manpower to help in doing offline work (mainly database related) and providing user-friendly tools
- Volunteers?

- Boaz Klima

- Collab. Meeting - 9/14/01

## Forward Proton ID

- Monte Carlo and GEANT Status
- FPDDigi:
-      Digitization package already in CVS
-      Changing access methods for the FPDDigiChunk; soon in CVS
- FPD GEANT:
-      Particle from IP with (p, θ)  reconstruct fiber hits
-      Fiber hits  reconstruct (p, θ)
-      GEANT/DØgstar modifications to double precision
-      Modifications completed and tested
- MCPP:
-      4 new packages with the event generators:
-         (POMPYT, PHOJET, POMWIG and SCIGAL)
-      Packages are already available in CVS

- Boaz Klima

- Collab. Meeting - 9/14/01

## Forward Proton ID - L1 and L3

-      Starting to simulate equations through Xilinx s; first FPGA's by November
**Unpacker for AFE boards**
-      Preliminary version available
**Track Reconstruction**
-      Multi-hit and vertex displacement correction; test release in few weeks
**L3Unpack Tool**
-      Preliminary version available; next step depends on the calibration tool
**Tracking Tool**
-     Fast implementation of the offline tracking
-      Improvements in ghost tracks rejection
**Single Interaction Tool**
-     Vertex information implemented and in CVS
-      Including Calorimeter information
-      Release for p11 (15 / October)

**Forward Proton ID**** - L1 and L3**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Jets and ET ID

- Run 2 Data

**Jets and E****T ****ID**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Jets and ET ID - Highest Priorities

**Level 3 Jets**
**Level 3 and Offline MEt**
**Hot Cell Killer**
**Level 2 Jets**
**Algorithmic studies**
- All in dire need of help!
**Level 3**
- Already running as part of L3
-     filtering
- Scone and kT implemented
- Need studies on data and MC
-     to optimize cuts and algorithms

- MC

- Data

- Boaz Klima

- Collab. Meeting - 9/14/01

## ET and Hot Cell Killer

**Missing ET**
- Offline (cell based) and Level 3 (cell and jet based) tools exist.
- No comprehensive data or MC studies.
- Re-vertexing available
**Hot Cell Killer**
- New Anomalous Deposit Algorithm
- Makes decision based on all neighbouring cells in a cube
- Needs to be part of reco
- Studies on Run 2 data
- MisId rate on MC cells with ET>10GeV – 0(5)% for NADA(AIDA)

- Raw

- After ‘hot cell’ removal

- Boaz Klima

- Collab. Meeting - 9/14/01

## Jets and ET ID – Studies & Level 2

- Algorithmic Studies
- Cone v/s kT
- Run1 v/s Run 2
- Lost jets
- Jet pointing
- Energy flow
**Level 2**
- 3x3 and 5x5 trigger tower window clustering available
- Will become critical soon
- ~10 reduction in rate (upg-geant)
- No recent study with pileup
**Help wanted!**

- Boaz Klima

- Collab. Meeting - 9/14/01

## EM ID

- Data Studies
- Large # of runs analyzed in search for EM objects
- Difficult due to “noisy” calorimeter (hot cells changing run-by-run) – work on online id in progress
- MC Studies
- EM efficiency
- QCD rejection
-     See p10 certification

- Boaz Klima

- Collab. Meeting - 9/14/01

## EM ID

- Trigger Studies
- L1, L2, and L3
- Currently mainly on signal
- Soon on large QCD samples
- Code development
- Thumbnail
- Fine-tuning of cpsreco
- Fine-tuning of L3 EM
- Update EM discriminants
-     with Plate-MC
- Global EM fit

- Boaz Klima

- Collab. Meeting - 9/14/01

## Muon ID

- Triggering on muon scintillator coincidences
- Successfuly reconctructiong triggered Famus muon tracks (since day 1) and Wamus tracks (since last week)
- Successfuly matching local muon tracks with central tracks (when available...)
- d0ve display of a high pt dimuon, possibly zmumu,  found in the muon system (but missed by SMT so far)
- Results - based on the runs 129* and 130194
- Total number of events 101,619
- mu1pix triggers 30,640
- mu2pix triggers 3,103** **** **

- Boaz Klima

- Collab. Meeting - 9/14/01

## Muon ID - Results

-         Low Mass                                           High Mass

- Boaz Klima

- Collab. Meeting - 9/14/01

## Tau ID

- Trigger
- Level 1: heavily based on track triggers. The CFT occupancy was measured and is a little better than the simulation
- Level 2: 1-prong and 3-prong triggering is implemented in L2CTT
- Level 3: algorithm exists and is implemented. Now it is time to tune and optimize

- Boaz Klima

- Collab. Meeting - 9/14/01

##                       Tau ID

- Offline
- Calorimeter and track seeded candidate finding
- Tau final states are separated into three types:                      h, h+n·0 and 3h+X
- Typical efficiency/rejection for MC
- 40% at 1% fake rate
- Major efforts at the moment
- Level 3 optimization
-  Multivariate studies on MC
-  Simple square cut optimization for early analyses
-  Data monitoring

- Boaz Klima

- Collab. Meeting - 9/14/01

##             Jet Energy Scale (JES)

- Objectives
- Jet energy scale
- Jet/Dijet energy/mass resolutions
- B-jet scale/resolution
- Monte Carlo jet scale/resolution
- Plans
- Moriond
- Very preliminary correction (large errors) including: energy-dependent esponse, showering correction for cone, underlying event, noise, muon/neutrino for b-jets, and parton-level correction
- Summer 2002
- Well-known correction from Run 1 method
- Preliminary energy scale from tracks and Z    bb

- Boaz Klima

- Collab. Meeting - 9/14/01

##             Jet Energy Scale (JES)

- Projects
- Response from photon+jet
- Response from Z+jet
- Showering correction
- Showering profiles in MC vs Data
- Offset energy
- Eta-dependence of response in ICR
- Global PT fit in photon+jet
- CellNN/Eflow algorithm calibration
- Z     bb
- E/p with ****
- Resolutions
- Correction package

-  Projects that need help
-  ****/****correction for b-jets
-  Parton level correction
-  Topology, KT etc biases
-  Background studies for response
-  Punchthrough study for response
-  Volunteers are welcome

- Boaz Klima

- Collab. Meeting - 9/14/01

##         JES – Preliminary Results

- Boaz Klima

- Collab. Meeting - 9/14/01

## 

Physics Groups

- Physics Groups

- Boaz Klima

- Collab. Meeting - 9/14/01

## Physics Groups - membership

- Based on the mailing distribution lists*
- 	(on the Fermilab LISTSERV as of Sept. 4, 2001):
- B – 63 (in July - 62); 13 theses on list *
- Higgs – 99 (84); 15
- NP – 127 (113); 26
- QCD – 49 (49); 4
- Top – 100 (81); 24
- WZ – 31 (28); 5
- All seem to be growing; some more than others
- 86 out of 120(?) grad-students in DØ already on the thesis list
- Disclaimers
- mailing distribution list is not necessarily the list of active members of a physics group
- Not all grad-students indicated (decided?) which physics topic to pursue

- Boaz Klima

- Collab. Meeting - 9/14/01

## QCD Physics: Priorities

-  Big opportunities for QCD in Run 2
- Higher  energy,  luminosity
- large pT reach for jets, photons, W/Z...
- Push limits of perturbative QCD
- soon available at NNLO (ME and PDFs)
- Improved detector, magnetic tracking
- event structure, low pT jets, photons
- Roman pots for diffractive physics
- FPD Motto: Anything you can do, we can do diffractively!
-  Priority studies – high interest/impact
- (large-x partons, deviations from QCD,  compositeness)
- High pT jet x-section
- Dijet angular distribution
- Elastic, Single Diffractive (Jets, Ws), and Double Pomeron processes

- Boaz Klima

- Collab. Meeting - 9/14/01

## QCD Physics: Plans and Dreams...

-  Many interesting analyses
- Energy flow in minimum bias and underlying event
- impact on energy corrections and resolutions, physics with Run 2b luminosity, thinking about LHC...
- Define our jets!
- comparisons, optimization of jet algorithms
- Direct photons and diphotons
- stress-test perturbative theory, radiation effects, resummations; constrain the gluon distribution
- Jets with tracking, event shapes
- Check QCD web page for more!

-  Working with other groups:
- W/Z+jets, W/Z p**T**
- Higgs studies require understanding of min bias events!
- Anyone interested in
-     splitting?
-  Let’s take the QCD program
-    beyond the Run 1 scope:
- We need your fresh views, past experience (HERA, LEP, fixed target...)
-  **Come and make a difference!**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Winter Conferences Goal
Give confidence that DØ can do B Physics in Run II 
Possible “Results” to Present
Mass Peaks
Ks, J/
sine qua non
Fully Reconstructed Decays
pretty event pictures
as many modes as possible
we can see B’s
b Cross-Section
we understand b-tag eff
J/ Production Rates
we understand J/’s
Lifetime in B  J/ X
we understand vertexing

- Give confidence that DØ can do B Physics in Run II
- Possible “Results” to Present
- Mass Peaks
- Ks, J/
- sine qua non
- Fully Reconstructed Decays
- pretty event pictures
- as many modes as possible
- we can see B’s
- b Cross-Section
- we understand b-tag eff
- J/ Production Rates
- we understand J/’s
- Lifetime in B  J/ X
- we understand vertexing

- Long Term Goals
- Make sure all competitive analyses are covered
- Some Key Topics
- sin 2 (B  J/ Ks)
- Non-SM CP (Bs  J/ )
- Bs mixing
- Rare Decays (B  K* *l*+*l*-)
- b Production
- b Lifetime
- + many others...
- Necessary Technical Analyses
- Bd mixing, Lifetimes, Tagging Studies
- + many others...
- People identified for many of these

**B Physics**

- Boaz Klima

- Collab. Meeting - 9/14/01

##                      B Physics

- Scrutinize the Data
- Ks	found some
- thanks Ariel & Sherry!
- J/	still looking
-  + jets	start effort
- use e’s	trigger?
- 2nd V’s	after break
- Monte Carlo
- Generator Level Cuts
- b’s (PT, ...),decay modes, Leptons (no., PT, ...)
- implement these in a simple, trackable way
- integrate into MC framework
- developing a “selector” tool
- Bring EvtGen from BaBar
- SMT only tracking

- Organizational Issues
- Integration with b-ID
- successful b Jamboree
- generating MC together
- Clear-cut task list
- well-defined, short-term jobs
- useful for people just starting
- SMT only tracking
- important to get results for conferences
- need to help out the tracking group here
**Still lots of room for help**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Electroweak (WZ)

- Eschewed Monte Carlo analysis in favor of looking at the RECO results on Data
- The goal - identify all W or Z boson candidate events and collect them for object ID and physics analysis
- La Machine - spins through the Global Run Root-tuples available through SAM.
- The WZ run/event database is temporarily at  **www-d0.fnal.gov/Run2Physics/wz/Public/database.html**** **
- plan to coordinate our lepton ID with the ID groups

- Boaz Klima

- Collab. Meeting - 9/14/01

## Electroweak (WZ)

- Plan on having results in time for the early spring conferences
- Priorities are
- cross section for W's and Z's in electrons and muons
- W+gamma in e's and mu's (search for radiation zero)
- Z' search in electrons
- These topics are consistent with the thesis students (5) working within the group

- Boaz Klima

- Collab. Meeting - 9/14/01

## New Phenomena

- Run I analyses
- A number of papers under group / collaboration review (squarks, RPV(2), LQ (METjj)) and few to come
- A good opportunity for newcomers to learn about physics at a TeV
- Run II analyses
- Embraced the model of priority analyses for Spring/Summer 2002
- Focus on detector understanding / algorithms / tools
- A number of high-priority analyses; will re-evaluate depending on progress and detector status after the October shutdown:
- Trileptons		1st gen LQ eejj
- e mET		extra dim  ee, 
-  mET
- RPV   & ’

- Boaz Klima

- Collab. Meeting - 9/14/01

## 

MC studies
Studies based on data, have provided feedback
Calorimeter (noisy / hot cells,..)
EM id (efficiencies, tools, ... )
Jet id (quality cuts, missing ET, ....)
Trigsim
Not easy to find good datasets for a given study
Need to move forward to other detectors / tools / algorithms

- MC studies
- Studies based on data, have provided feedback
- Calorimeter (noisy / hot cells,..)
- EM id (efficiencies, tools, ... )
- Jet id (quality cuts, missing ET, ....)
- Trigsim
- Not easy to find good datasets for a given study
- Need to move forward to other detectors / tools / algorithms

- di-jet event acoplanarity

- After
- cleaning

- before
- cleaning

- Hot / dead regions in calorimeter

**New Phenomena**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Higgs

- Taking off from where we left off in the HiT group:
- Triggers, jet resolutions, b-tagging, MC and some analysis issues
- Basic Info:
- Meetings Friday  10:30am-12:30pm – ON weeks
- Email list and archive: D0-Higgs@fnal.gov
- D0 News folder: HIGGS
- Web Page:
- _[http://www-d0.](http://www-d0.fnal.gov/Run2Physics/higgs)__[fnal](http://www-d0.fnal.gov/Run2Physics/higgs)__[.](http://www-d0.fnal.gov/Run2Physics/higgs)__[gov](http://www-d0.fnal.gov/Run2Physics/higgs)__[/Run2Physics/](http://www-d0.fnal.gov/Run2Physics/higgs)__[higgs](http://www-d0.fnal.gov/Run2Physics/higgs)_
- Representation in D0 Infrastructure groups
- Trigger Board:   Suyong Choi
- Offline Resource Board:  Neeti Parashar
- Monte Carlo Production: Qizhong Li

- Boaz Klima

- Collab. Meeting - 9/14/01

## Higgs - Timelines

- We see at least five natural time scales:
- a. The period between now and Spring 2002 conferences
- b. The period between Spring and Summer 2002 conferences
- c. the period between Summer 2002 and 1 fb^{-1}
- d. Between 1 and 2 {fb-1}
- e. beyond 2 fb^{-1}
- What are appropriate issues for each of these periods?
- Need to consider the full object/physics matrix

- Boaz Klima

- Collab. Meeting - 9/14/01

## Higgs - The Physics/Object Matrix

- Boaz Klima

- Collab. Meeting - 9/14/01

## Higgs - Working Groups

- Initially 3 groups
- Group A:  high-pT charged lepton group
- including single-lepton+jet final states, multi-lepton+jet final states and  photon+jet final states
-     Group B: jet group
- including jets+MET final states and all jets final states
-     Group C: jj mass and b tagging for higgs studies.
- Structure in response to available manpower, trying to insure that there is a critical mass in all final states, and that no analysis is orphaned.
- Common basic selections are a clear goal
- Both offline and trigger level
- start with object ID groups’ definitions
- are these right for us? Searches are different than precision measurement. If not, must feed back into object ID groups
- No choice is perfect; will be cross group issues

- Boaz Klima

- Collab. Meeting - 9/14/01

## Higgs - Goals for Spring ‘02

- Pick 3 basic topologies
- W(l)+jets
- Z(ll)+jets
- Z bb
- What will we have?
- First pass trigger efficiencies (?)
- Basic selections with event distributions overlaid with Monte Carlo
- Both tagged and untagged samples
- Event rate comparisons? Physics cross sections?

- Boaz Klima

- Collab. Meeting - 9/14/01

##                  Top

**                                                    **

** ****What is being done:**
** ****MC studies for analyses feasibility& preparation and for trigger studies**** ****(mostly L1Cal/L2GBL, L1Muo)**
** ****Determine MC/Data needs for evaluation of systematics (jet energy corr./b-tag)**
** ****What we are starting to do:**
** ****Look at data to: understand the detector, understand triggers, jet corrections,...**
** ****Efficiency studies performed on MC electron, ttbar, and QCD samples**
** ****Working to run trigsim on actual data and to produce data efficiencies**

- Boaz Klima

- Collab. Meeting - 9/14/01

##       Top – Studies and Results

**some advantage from doing this a second time around:**

**use Run I mass fitting tools (l+jets, dilepton),  investigate the use of full event kinematics (Matrix Element method) for mass and properties. Examples:**

**needs b-tag data analysis **
**(efficiency, fakes) and jet corrections (work ongoing on response and resolutions)**

**pair production cross-section**

**so far: mostly l+jets, b-tag**
**(soon with kinematical analysis)**
**also all-jets trigger studies**

**1****st ****plot we would like to produce**
**on l+jets, with any selection**

- F0 = 0.696 ± 0.097

- Input: F0=0.703

-  = mW2/mt2

**W’s helicity **
** ****in top decays**

**dilepton**
**mass**

- after jet
- corrections

**      ****Top – Studies and Results**

- Boaz Klima

- Collab. Meeting - 9/14/01

## Where are we now?

- Still lots to do before we get to Physics
- Complete the detector + trigger system
- Understand what it does – Commissioning/Integration
- Calibrate, align, develop algorithms (L3&Offline)
- Everything else that nobody wants to talk about...
- However, a lot has already been accomplished
- We see Ks, muons, jets, electrons, ’s, W’s,...
- We are about to see first Z’s, J/’s, b’s,...
- We insert physics-related (non-pure commissioning-related) triggers in the trigger list
- Algorithm/Id groups work both on Data and MC
- Physics groups gearing up for long and short-term challenges

- Boaz Klima

- Collab. Meeting - 9/14/01

## Conclusions

- Exciting times ahead of us
- Much has already been accomplished
- Still lots to do before we get to Physics
- If you haven’t done so, get involved ASAP
- We should all work together in a very coherent and focused way
**Let’s get ready to produce first Physics results in 2002!**

- Boaz Klima

- Collab. Meeting - 9/14/01