MC Misalignment MC Misalignment

George Vesztergombi

Tracker DPG meeting, 25.11.2011

25.11.11 Budapest Group 2

Credits

Budapest: Adam Agocs, Krisztian Krajczar, Ferenc Sikler, George Vesztergombi

DESY: Joerg Behr, Gero Flucke, Justyna Tomaszewska CERN: Alessio Bonato, Roberto Castello

Aachen: Natalie Heracleous

25.11.11 Budapest Group 3

Intro Latest startup Dec 2010, only cosmics + minbias

Plots from Adam or Natalie?

Z with only IDEAL and Startup geoms

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Strategy

Aim: find an alignment (including sensor bow parameters) on MC, which performs close to the current data

alignment Momentum biases as seen with Z-mass validation Local precision as seen with track based validation

Geometry production:

starting from an MC geometry + bow parameters from data

~ similar to data approach

25.11.11 Budapest Group 5

Datasets Input: same datasets as in real data:

Isolated muons from W (16.3 M tracks) Isolated muons from QCD-mu enriched events (2.3 M tracks)

Minbias tracks (450k events ~ 4.5 M tracks) Zmumu events using mass constraint (390k events)

Peak mode cosmics (1.8 M used tracks) Deco mode cosmics (1.7 M used tracks)

Different weights for cosmics (x2, x0.5) → negligible change in the produced geometry

pT and eta distribution in data and MC

Adam plots

25.11.11 Budapest Group 7

List of valid geometries Alignments starting from ideal and startup MC geometries +

bows from data:

The presence of the Z-mass φ-mode seems completely determined by the starting geometry

Roberto produced hybrid geometries which lay between ideal and startup:

Starting from ideal and adding a fraction of the difference from startup

IDEALplus_02Delta IDEALplus_033Delta IDEALplus_05Delta

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Realigned bows IDEALplus_05Delta

Kinks and δ-bows

25.11.11 Budapest Group 9

Track based validation 2 DMR

2 BPIX, 2 FPIX, TOB, TEC

Plots from Adam

25.11.11 Budapest Group 10

Track based validation DRR

Plots from Adam

25.11.11 Budapest Group 11

Cosmic split ΔK, Δθ

Plots from Adam

25.11.11 Budapest Group 12

Z validation Mass peak

Plots from Natalie

25.11.11 Budapest Group 13

Z validation

MZ vs η, M

Z vs Φ for all tracker

http://natalie.web.cern.ch/natalie/directory/Tracker_Alignement_Task/111111/All/

25.11.11 Budapest Group 14

Z validation

MZ vs Φ in Barrel, M

Z vs Φ in TEC+

http://natalie.web.cern.ch/natalie/directory/Tracker_Alignement_Task/111111/TEC+/

Barrel

Barrel TEC+

TEC+

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Z validation

MZ vs Δη

Plots from Natalie/Roberto?

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Chosen geometry The BPIX centred IDEALplus_05Delta is chosen

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Geometry comparisons Geometry comparison vs ideal

BPIX (3x5 plot)

Plots from Adam

25.11.11 Budapest Group 18

Geometry comparisons Geometry comparison vs ideal

TOB (3x5 plot)

Plots from Adam

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Summary Conclusions

Outlook

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Backup slides