9/2/2009 Pd/sw-analysis meeting 1

Analisi/CMSnotes(+NIM) dei muoni previste per i dati CRAFT

M.C.FouzDPG 5/2/09

9/2/2009 Pd/sw-analysis meeting 2

Overview:

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Vdrift

CMSnote2008/001

M.C.Fouz DT-DPG 4/12/08

CRAFT

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Towards a CMS note on CRAFT

results from DT Local Muon Reco…

http://www.pd.infn.it/~ugs/temp/CRAFT/NoteLocalReco/

“draft0” on:

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Intro

-We have plenty of good data and (preliminary/partial) results from the full DT detector, operating highly efficiently for ~1 month of CRAFT operations

- working on a “Reconstruction results” paper may help also on focusing on problems, refining algorithms/ procedures, improving calibration/alignemnts… in one word , preparing ourselves at best for pp data taking - NOT a “chamber performance” paper (at least in my view…there may well be one other paper (or more than one) on this, of course); focus here is on reconstruction of the “building blocks” of a muon track

-May be merged at the end with content of another note on global muon reco results, for an external (e.g. NIM) publication

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Local Reco note: proposed layout1. Intro CRAFT description & motivation, general operations…2. DT setup, conditions, triggers…3. Local Reco algorithms short remind, reference to existing notes (one is ongoing).4. Calibration needed for “1st level rechits”, which are input to pattern recognition; ttrigg results, stability (there may be some overlap with vdrift note)5. Results rechit level: 1st level 2nd level with t0 refit final resolutions segments & their correlations: alignment issues, measurement of bending capability, mult. scattering effects ; (dedicated note on showering )

In following slide a few example of material…

(+ some attempt to propose work to interested persons…)

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1. From times to rechits: Ttrigg

Stability & uniformity

M.C.Fouz,CRAFT jamboree 11/12/08

Maselli/Cerminara(old plot on CRUZET data)

Silvia/Sarato provide material/text forthis paragraph ?

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2. Rec Hits

dataMC

**Before** t0 fit:input to pattern recognition/segment building

Example: YB0 sect 4

**ju

st a

dra

ft ex

ampl

e**

All chambers

should be240 chambers(- a few switched off)

likely to come frominclined sectors…verify calibration there…

Gianluca,Stefano L.

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Cell efficiency & RecHits

M.C.Fouz,CRAFT jamboree Nov ‘08

On MC, we have this…(“Local muon Reco in DT”,CMS note in preparation):

Can we do the same on data ?(replacing dsim with dextrap.)

Well establishedprocedure for cell efficiency Computation since chamber commissioningShow overall results (in termsof cell efficiency averaged on a SL)

Francesca?

May affect hit multiplicityIn segments; we do seedifferences w.r.t. simulations(see below)

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t0 fit

Anna M.CRAFT meeting4/12/08

T0 correlation between chambers,TOF measurements….

Anna

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Hit residuals: YB-2, Sect 4

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Fit results in all chambers

**ju

st a

dra

ft ex

ampl

e**

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Segments: associated Hit multiplicities

local angle directions:Data-MC comparison maybe crucially dependent ontrigger assumptions/selections…

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Segments: efficiencies

-Using interpolations between neighbouring stations Santolalla

- Using extrapolation from tracker

A.Branca, P.BellanF.Cavallo

MB1

MB3

MB2

MB4

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Angle correlations: Dphi @ B=0, alignment issues

Run70675(end of CRAFT: 11/11/2008 ) Run66475

(begin of CRAFT: 16/10/2008 )

Alicia, Ugo

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Dphi fits, all stations

differenceRun70675- Run66475

Run70675

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Bending MB1-MB2

discuss alsomult. scattering evolution…is it what we expect frommaterial, p,…

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Bending:MB2-MB3 MB1-MB4

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Altre note:

-Specifici layout dei contenuti non ancora presentati

-Prossimi step: DTDPG 12/2/09

Muon Barrel workshop CERN 16-17 Febbraio: first review

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AoB: B field studies

Alicia/Ugo

Method: bending between consecutive stations (using pT from Tracker):

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B field (II)

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B field studies (III)Francesca/Anna

pT (Tracker)

Method: extraplation from Tracker

Average of residuals of XmeasDT-Xextrap (cm):

noteasymmetry

MB4MB3MB2MB1

upper sectors

lower sectors

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AoB: alignment

- Study geometry of MBn station extrapolating good quality segments originating from a defined (relatively small region: ~ a few DT cells long) in MBn-1

- Study residuals of segments in MBn w.r.t. extrapolations, as a function of local position in MBn

MBn

MBn-1

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Alignment (II)MB2, MB3 & MB4 chambers in Sect.4, all wheels:

YB-2YB-1YB0YB+1YB+2

MB2 MB4MB3

**before** SL corrections

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Alignment (III)

these looks like rigidrelative displacements(O(~1 mm))between chambersin same sector

YB-2YB-1YB0YB+1YB+2

** after** SL corrections