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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, A.Calderon, A.Gresele, U.Gasparini, A.Meneguzzo (+ F.

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Presentation on theme: "1 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."— Presentation transcript:

1 1 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 strettamente correlate.. Prima esperienza di unaend-to-end analysis (da P5 a Phys.Lett.) in CMS…

2 2 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 trigger collected so far… http: //malgeril.web.cern.ch/ malgeril/coll_stats/collcosm.html

3 3 Prompt DT analysis http: //cmsdoc.cern.ch/cms/MUON/dt/sx5 / DT detector performance overview More detailed info by wheels [ DPG joint effort…]

4 4 Example of DT-DQM certified good run DT local trigger efficiency good DT calibration, Run Missing DDU-trigger data in Wheel+1; data available anyway from trigger DCC

5 5 DT local reco: reco segments Run 67838, B=3.8 T 12,7 M triggers 12,35 M good segments in MB1 (Nhit(rf)>5 & Nhit(rz)=3 or 4)

6 6 Muon reco 16,9 Million of Tracks

7 7 Example of mu reco performance study: 2 legs STA muons Run M events analyzed (~ 45% of total triggers) DT segment multiplicity StandAlone muons associated hits to tracks cut 4,1 M with N legs =2 difference in Z-impact parameter z, both legs with N hit >30 z| < 20 cm 1,100,000 STA pairs pT /pT~36% 1st leg 2nd leg

8 8 Control of Mult.scattering & bending B = 0 (CRUZET4) B = 3.8 T ? ? (MB3)- (MB2) (MB4)- (MB3) (MB2)- (MB1) (MB4)- (MB1)

9 9 Data vs MonteCarlo Hit/segment/track resolution & efficiency to be x-checked with cosmic MontCarlo… - B ON RECO production not yet available… - First comparisons B=0 (CRUZET4 data) … For more detail see e.g. Ambras muon POG, 13/10/08:

10 10 1 leg STA tracks vs Tracker tracks 1 leg STA Track, Nhit > 60 Tracker track pT /pT~25% pT /pT~22% pT /pT~18%

11 11 Charge identification: 1 leg STA vs Tracker 880 out of 27,700 tracks (3.2%)

12 12 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, todays talk by Cosmic Muon Analysis meeting: [ I wish also to advertise Stefanos talks on reco related todays muon POG ]

13 13 Mu+/mu- ratio: 1st look Using one leg STA Tracks with Nhit > 60 unphysical tail… 25,000 tracks (this corresponds to ~3% of total CRAFT statistics) uncorrected for charge mis-identification

14 14 Stability of result: another run ( )

15 15 Alignment checks (very preliminary) Alicia No alignment Alignment tag in Official reco

16 16 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

17 17 Tools for analysis Analyzer 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


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