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1 Attivita su analisi dati cosmici (CRAFT: B=3.8 T & CRUZET(B=0) Pd meeting, 10 Nov 2008 A.Branca,...
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Transcript of 1 Attivita su analisi dati cosmici (CRAFT: B=3.8 T & CRUZET(B=0) Pd meeting, 10 Nov 2008 A.Branca,...
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Attivita’ su analisi dati cosmici(“CRAFT”: B=3.8 T & CRUZET(B=0)
Pd meeting, 10 Nov 2008
A.Branca, A.Calderon, A.Gresele, U.Gasparini, A.Meneguzzo(+ F. Cavallo, Bologna)
- Contributo alla DT “prompt analysis”
- Studio prestazioni della ricostruzione muoni di ‘alto livello’ (tracce muoni globali, matching con Tracker, risoluzione in momento, allineamenti…)
- Misura di fisica: rapporto mu+/mu-
- TOF per HSCP (non trattata qui)
- Piani e seggerimenti per possibili ulteriori sviluppi
Attivita’ strettamentecorrelate..
Prima esperienzadi una“end-to-endanalysis”(da P5 a Phys.Lett.)in CMS…
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Intro
statistics is not an issue…
- while doing a physics measurement (e.g. mu+/mu- ratio in cosmics, differential spectrum, TeV muons flux…) may concentrate on many different aspects of reconstruction, trigger performance, sources of systematics errors…
examples: - perform different tracks selection, with loose/tight criteria on track topology/quality - study/keep control of momentum resolution, charge identification - Test stability of results against different runs, triggers, detector data quality…
CRAFT: ~300 M triggercollected so far…
http: //malgeril.web.cern.ch/malgeril/coll_stats/collcosm.html
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Prompt DT analysis http: //cmsdoc.cern.ch/cms/MUON/dt/sx5/
DT detectorperformanceoverview
More detailedinfo by wheels
[ DPG joint effort…]
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Example of DT-DQM certified good run
DT local trigger efficiencygood DT calibration,
Run 67838
Missing DDU-trigger data in Wheel+1; data availableanyway from trigger DCC
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DT local reco: reco segments
Run 67838, B=3.8 T12,7 M triggers
12,35 M “good” segments in MB1(Nhit(rf)>5 & Nhit(rz)=3 or 4)
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Muon reco
16,9 Millionof Tracks
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Example of mu reco performance study:“2 legs” STA muons
Run 6783812.7 M eventsanalyzed (~ 45% of total triggers)
DT segmentmultiplicity
StandAlone muons
associatedhits to tracks
cut
4,1 M with Nlegs=2
difference inZ-impactparameter
z,both legswithNhit>30 z| < 20 cm
1,100,000STA pairs
pT/pT~36%
1st leg
2nd leg
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Control of Mult.scattering & bending
B = 0(CRUZET4)
B = 3.8 T
?
?
(MB3)-(MB2)
(MB4)-(MB3)
(MB2)-(MB1)
(MB4)-(MB1)
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Data vs MonteCarlo
Hit/segment/track resolution & efficiency to be x-checkedwith cosmic MontCarlo…
- “B ON” RECO production not yet available…
- First comparisons performed @ B=0 (CRUZET4 data) …
For more detail see e.g. Ambra’s talk @ muon POG, 13/10/08: http://indico.cern.ch/conferenceDisplay.py?confId=42597
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1 leg STA tracks vs Tracker tracks
1 leg STATrack,Nhit > 60
Trackertrack
pT/pT~25%
pT/pT~22%
pT/pT~18%
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Charge identification: 1 leg STA vs Tracker
880 out of27,700 tracks(3.2%)
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Mu+/Mu- ratio
P.Garcia, CMS Phys.Plenary 6/11/08
http: //indico.cern.ch/conferenceDisplay.py?confId=44067
Florida,CIEMAT
Padova, Bologna
More info, today’s talk by Ambra @ Cosmic Muon Analysis meeting:http://indico.cern.ch/conferenceDisplay.py?confId=45080
[ I wish also to advertise Stefano’s talks on reco related topics @ todays’ muon POGhttp://indico.cern.ch/conferenceDisplay.py?confId=43177 ]
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Mu+/mu- ratio: 1st look
Using“one leg” STATrackswith Nhit > 60 unphysical tail…
25,000 tracks(this correspondsto ~3% of totalCRAFT statistics)
uncorrectedfor chargemis-identification
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Stability of result: another run ( 66783 )
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Alignment checks (very preliminary)
Alicia
No alignment
Alignment tag inOfficial reco
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Tools for analysis- CAF (Cern Analysis Facility) almost saturated from processing, prompt analysis…-Some long good run transferred to Legnaro-T2-See https://cmsweb.cern.ch/dbs_discovery/
66615,66783,67838
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Tools for analysisAnalyzer code on:
/raid4/data/share/CRAFTanalysis/DAnalyzer.cc
Produced rootple on:/raid4/data/share/CRAFTanalysis/rootple
Rootples contains: - trigger info (local chamber & DTTF) - DT segment info - muon standalone 2 legs collection - muon standalone 1 leg collection - muon global 2 legs collection - muon global 1 leg collection
- Tracker tracks collection