Analisi/CMSnotes( NIM)%20dei%20muoni%20previste%20per%20i%20dati%20CRAFT

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Analisi/CMSnotes(NIM) dei muoni previste per i
dati CRAFT
M.C.Fouz DPG 5/2/09
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Overview
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Vdrift
CMSnote 2008/001
CRAFT
M.C.Fouz DT-DPG 4/12/08
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Towards a CMS note on CRAFTresults from DT
Local Muon Reco
draft0 on
http//www.pd.infn.it/ugs/temp/CRAFT/NoteLocalRec
o/
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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 viewthere 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 layout
1. 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
Maselli/Cerminara (old plot on CRUZET data)
Silvia/Sara to provide material/text for this
paragraph ?
M.C.Fouz, CRAFT jamboree 11/12/08
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2. Rec Hits
Example YB0 sect 4
Before t0 fit input to pattern
recognition/ segment building
data
MC
All chambers
should be 240 chambers (- a few switched off)
just a draft example
Gianluca, Stefano L.
likely to come from inclined sectors verify
calibration there
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Cell efficiency RecHits
On MC, we have this (Local muon Reco in
DT, CMS note in preparation)
Francesca?
d
Can we do the same on data ? (replacing dsim with
dextrap.)
Well established procedure for cell efficiency
Computation since chamber commissioning Show
overall results (in terms of cell efficiency
averaged on a SL)
May affect hit multiplicity In segments we do
see differences w.r.t. simulations (see below)
M.C.Fouz, CRAFT jamboree Nov 08
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t0 fit
T0 correlation between chambers, TOF
measurements.
Anna
Anna M. CRAFT meeting 4/12/08
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Hit residuals YB-2, Sect 4
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Fit results in all chambers
just a draft example
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Segments associated Hit multiplicities
local angle directions Data-MC comparison may be
crucially dependent on trigger assumptions/selecti
ons
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Segments efficiencies
MB3

• Using interpolations between
• neighbouring stations

Santolalla
- Using extrapolation from tracker
A.Branca, P.Bellan F.Cavallo
MB2
MB1
MB4
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Angle correlations Dphi _at_ B0, 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
difference Run70675- Run66475
Run70675
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Bending MB1-MB2
discuss also mult. scattering evolution is it
what we expect from material, 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
Method bending between consecutive stations
(using pT from Tracker)
Alicia/Ugo
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B field (II)
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B field studies (III)
Method extraplation from Tracker
Francesca/Anna
Average of residuals of XmeasDT-Xextrap (cm)
MB4 MB3 MB2 MB1
lower sectors
note asymmetry
upper sectors
pT (Tracker)
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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
before SL corrections
MB3
MB2
MB4
YB-2 YB-1 YB0 YB1 YB2
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Alignment (III)
after SL corrections
YB-2 YB-1 YB0 YB1 YB2
these looks like rigid relative
displacements (O(1 mm)) between chambers in same
sector