Preliminary Slice Test Track Fitting S. Durkin Sept. 8, 2005

Analyze RunNum1007Evs0to49999.bin using /AnalysisUtilities

• look for tracks in two separate CSC’s• trigger very loose, 9291/50000 such events found• single overall cross talk and noise constants used• events typically very well fit (see next two pages)• analyze data with CSC5 and CSC9 hit.

CSCID Chamber Type 4 ME2/1 16 no data 5 ME2/2 31 7 ME2/2 32 8 ME3/1 16 no data 9 ME3/2 31 10 ME3/2 32

CSCID1 CSCID2 Events 5 7 636 5 9 3129 5 10 1423 7 9 994 7 10 2326 9 10 670

Red Events chamber overlap.

************ Event ID 38 CSC ID 5 CSC type 0 Cathode Tracking: Number of Tracks 1

Track 0 Plane 0 Hits 0 y 61.8693 dy 0.07552 dif -0.0715 used Plane 1 Hits 0 y 61.2128 dy 0.02231 dif 0.0251 used Plane 2 Hits 0 y 60.6817 dy 0.00702 dif -0.0037 used Plane 3 Hits 0 y 60.1169 dy 0.01132 dif 0.0012 used Plane 4 Hits 1 y 59.5459 dy 0.01219 dif 0.0123 used Plane 5 Hits 0 y 59.0460 dy 0.03158 dif -0.0477 used

Cathode Track Fit (4 DOF) for track 0: Slope -0.55990 Intercept 61.7978 Chisqr 5.752332

Typical Track – Evt 38 CSCID 5 (Near Side)

Distance from track in Strips.Typically < 200m

************ Event ID 38 CSC ID 9 CSC type 0 Cathode Tracking: Number of Tracks 1

Track 0 Plane 0 Hits 0 y 36.5085 dy 0.00424 dif 0.0006 used Plane 1 Hits 0 y 36.0551 dy 0.00995 dif -0.0662 not used Plane 2 Hits 0 y 35.4979 dy 0.01635 dif -0.0292 used Plane 3 Hits 0 y 34.9292 dy 0.01200 dif 0.0194 used Plane 4 Hits 0 y 34.4546 dy 0.01630 dif -0.0261 used Plane 5 Hits 0 y 33.8762 dy 0.02779 dif 0.0321 used

Cathode Track Fit (4 DOF) for track 0: Slope -0.52015 Intercept 36.5090 Chisqr 9.727195

Typical Track – Evt 38 CSCID 9 Far Side

Cathode Strip Angle Matching

Black Curve – CSC5 Red Curve – (CSC5 minus CSC9 )

• Compare track angles• Ignore any geometry corrections

CSC9 (degrees)

CSC

5 (

degr

ees)

Num

ber

of E

vent

s

(degrees)

~ 4 degrees

Cathode Strip Intercept Matching• Extrapolate track intercept• Ignore any geometry corrections except for Z position• Note: CSC5 and CSC9 are back to back (mirror images)

CSC

5 pl

us C

SC9

Inte

rcep

t (st

rips

)

CSC5 Slope

Black Curve – CSC5 InterceptRed Curve – CSC5 and CSC9 Corrected Intercept difference

Num

ber

of E

vent

s

Intercept (strips)

~ 2.5 strips

Best Fit DistanceBetween Chambers 101cm

Cathode Strip Expected Resolution

• covariance matrix from the least-squares fits to the track can be used to estimate angular error and extrapolation error• using PDG notation

D/222 2

111211112 )/100(//1 Dposition

edextrapolat

• from the data- angular error 0.15 degrees extrapolated position 0.6 strips

Cosmic ray spectrum is very hardat 75 degrees. Something else is going on !

Anode Wire Angle and Intercept Matching

• Anode tracks (units of wire groups) • Ignore any geometry corrections except for Z position

CSC

9

(deg

rees

)

CSC5 (degrees)

CSC

5 m

inus

CSC

9 In

terc

ept (

wir

e gr

oup)

CSC5 Slope

Where to go from here…

Num

ber

of E

vent

s

Num

ber

of E

vent

s

Difference in Slopes Difference in Slopes

Cathode:Black = csc5-csc9Red = csc5 –csc7 (overlap)

Cathode:Black = csc5-csc7 all anglesRed = csc5-csc7 slope5 <0.1

• Strip width variation must be added• Something else is going on, See the two plots below.• Probably best to start with overlap events for simplicity.