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:
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
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
“Jetty Event” Blow up the tracker view:
A Matching CFT track CFT track with Et/Pt=0.48
CFT & SMT Tracks Interesting data sample.
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
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
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
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 1 2 3 Get_file_Link Missing Gear is Pick Events
Drell-Yan 1999 PRL from CDF M(ee) is in a minimum @ 60 GeV/c^2
“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.
Missing E T “MinBias Events” Run 131974 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”
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”
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
Candidate Event Reminder: We must turn our attention to muons ASAP.
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.
END of Presentation Beginning of storage slides
Data Analysis La Granda Macchina is producing tapped-out root-tuples and raw data samples for you to study. You have been receiving email about them & Julie will tell you all about the progress.
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
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?
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=0.95 - go figure.
Another Electron Characteristics: ET(EM) = 20 GeV/c M(ee)= 44 GeV/c2 Found CFT track, E/p=0.48
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
Electron Looked in Charged_Particle bank ET(EM) = 26 GeV/c M(ee)=52 GeV/c2 Found CFT track, E/p=0.95
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
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