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Scanning Z->ee Candidates  Poor Man’s Picked 88 candidates (/usrdisks/714/fnal_3/diehl/run2/zeesearch/zst rip/stripped/all*.raw)  Used D0ve_alldis to.

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Presentation on theme: "Scanning Z->ee Candidates  Poor Man’s Picked 88 candidates (/usrdisks/714/fnal_3/diehl/run2/zeesearch/zst rip/stripped/all*.raw)  Used D0ve_alldis to."— Presentation transcript:

1 Scanning Z->ee Candidates  Poor Man’s Picked 88 candidates (/usrdisks/714/fnal_3/diehl/run2/zeesearch/zst rip/stripped/all*.raw)  Used D0ve_alldis to look at event display pictures.  Classified the events.  It’s not so easy to tell photons from electrons in this data.  I’m not very good at divining the difference between highly EM jets and photons, for that matter. Tom Diehl Oct 02, 2001

2 Comments on Z Scan  Categories:  Only 2 Nice isolated Central EM clusters 16  2 EM clusters “seems OK” 19  Jetty/Metty/or lots of SVX hits in EM cluster direction (includes many events with a forward EM) 28  Forward EM & Not Jetty/Metty 15  Other (hot cell events dominate display) 10

3 “Jetty Event”  Blow up the tracker view:

4 A Matching CFT track  CFT track with Et/Pt=0.48

5 CFT & SMT Tracks  Interesting data sample.

6 2 SVX tracks match in phi view  Many of the EM clusters have SVX tracks which point at them. Cal M(ee)=71 GeV/c 2

7 Summary & Plan  Sure looks like this is the Z to ee.  Finish up the T1.56 root files  tapouts  pickevents - try out new picker  finish the La Granda Macchina data sets  La Granda Macchina  working on technical issues such as tapping out W and Z samples in same crank of the gears  Take advantage of new RecoVersion when becomes available  Make better use of the SMT, SMT&CFT, and CFT tracks  Muons

8 WZ Groups W & Z Search  What we did after we selected the events:  Poor Man’s Pick Events: SAM & Copyd0om  runreco (see d0tools)  runrecoanalyze (see d0tools)  d0ve_alldis  Results  Missing E T  Scanning  Summary & The Plan Tom Diehl 09/28/01 Instructions on WZ web page

9 La Macchina Key: Input Product WZ Run & Event Database (Web-based) All Reco’d Runs in SAM Event Selector “WZ_catchup” PRJ disk of Links to SAM cache “Tapped-out” Events for analysis Run Text File Update Database Get_file_Link Missing Gear is Pick Events

10 Drell-Yan  1999 PRL from CDF  M(ee) is in a 60 GeV/c^2

11 “W Candidates”  Event Selection: see Marco’s slides  I used the SAM Browser and data access methods, Get_file.py, & CopyD0om.py to extract the 121 events and put them in a directory.  Temporary location: d0mino /usrdisks/714/fnal_3/diehl/run2/zeesearch/wstr ip/stripped/all*.raw Z Candidates will be in...zstrip/stripped/all*.raw before the end of tomorrow.

12 Missing E T  “MinBias Events” Run Prior to Hot Cell KillerHot Cell Killer Applied Hot Cell KillerMore Hot Cell Killer MET Warning: some of ECN HV unplugged for some time G. Bernardi made these plots using “NADA”

13 Missing E T  “W Candidates” Prior to Hot Cell KillerHot Cell Killer Applied Hot Cell KillerMore Hot Cell Killer MET Warning: some of ECN HV unplugged for some time G. Bernardi made these plots using “NADA”

14 Scan the Events (d0ve_alldis)  Observations  scanning was very helpful in understanding what was going on in these events  candidates were mostly dijets  MET direction and magnitude not shown in the scan display  Results from 121 W-candidates  20 events are “W-like”  22 events are “weakly W-like”  75 events were clkearly dijets or “jetty”  4 events weren’t classified

15 Dijet Examples

16 W-Like Example

17

18 Candidate  Event Reminder: We must turn our attention to muons ASAP.

19 Summary & The Plan  Looks like Z’s and W’s to electrons with ~1/2 energy scale but we haven’t proved it  so Run La Macchina and accumulate our W and Z to electron(s) candidates  improve our use of tracking information  MET in the selection?  Use preshower and other detectors  Muons  this is a big hole in our operation and we must get on this asap.

20 END of Presentation Beginning of storage slides

21 Data Analysis  La Granda Macchina is producing tapped-out root-tuples and raw data samples for you to study.  You have been receiving about them &  Julie will tell you all about the progress.

22 Agenda  News: Tom & Georg  La Granda Macchina: Julie Torborg  W & Z to Electrons: Marco Verzocchi  More W & Z to Electrons: Tom Diehl  Electrons in Data: Ming-Cheng Gao  MC Requests & Card Files: Georg Steinbrueck  AOB & Around the Room

23 Triggers & ORB  Ask Amber/Alan  Dimuon Trigger has been implemented in the central region (unprescaled?)  L3 filter applied on some calorimeter triggers & soon close to ready for muons –but what’s the strategy and how can we contribute to a sensible approach?)  Ask Andrew  More disk will be available soon?  Coherency of WZ group plan –can the universities in WZ group pool resources? –if Clued0, can we all access the resources?

24 News  WZ put in for a bottle of wine for the first electron with a CFT match.  Looked in Charged_Particle bank  ET(EM) = 26 GeV/c M(ee)=52 GeV/c2  Found CFT track, E/p= go figure.

25 Another Electron  Characteristics:  ET(EM) = 20 GeV/c M(ee)= 44 GeV/c2  Found CFT track, E/p=0.48

26 Data Analysis Plan  W/Z group is going to continue to look at each collider run. WZ Run Database RECO WZ Preselection Candidates (SAM Projs) WZ Objects eventually  RECO does, uh, RECO.  W/Z preselection based on leptons  Database has run by run stats (J.K.)  Get Candidate Events  Develop W/Z objects

27 Electron  Looked in Charged_Particle bank  ET(EM) = 26 GeV/c M(ee)=52 GeV/c2  Found CFT track, E/p=0.95

28 Bad Electron Candidate?  Looked in Charged_Particle bank  ET(EM) = 15 GeV/c M(ee)= 35 GeV/c2  Found CFT track, E/p=1.2 but it’s not the closest track

29 La Macchina  Event Selector uses  Standard very loose object-ID based event selection  so far only on electrons with purpose of getting a Z sample  Event Selector (gear #2) Runs on  Root-tuples produced by Reco  Plan to Adapt to whatever is the best small reco output  Done  All 3 gears have been turned  We’ve run on all of the Reco 1.56 Output & at present we are iterating gear #2 on that sample  Not Done  Plan to start turning gear #3 when we get satisfied with the result of gear #2.  We’ve got no interface to “Pick Events” which is, for time being, non-existent


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